CN111882849A - A kind of temperature and humidity collection and detection device inside and outside a granary and its detection method - Google Patents

Abstract

The invention discloses a temperature and humidity collection and detection device inside and outside a granary and a detection method thereof. The device includes a detection device, a measurement and control cable, a temperature and humidity measurement and control circuit and a processor. The temperature and humidity measurement and control circuit includes a read data pin, a write data pin, a pull-up drive pin, a pull-down drive pin, a data pin, a non-inverting buffer line drive module, a current amplifying module, a circuit protection module, and a current amplifying module. two. The non-inverting buffer line driver module is connected to the read data pin and the data pin, the circuit protection module is connected to the write data pin and the data pin, and the current amplifier module 1 is connected to the pull-up drive pin and the data pin. , the second current amplification module is connected to the pull-down drive pin and the data pin. The input and output ends of the processor are connected to the read data pin, the write data pin, the pull-up drive pin and the pull-down drive pin. The invention improves the communication reliability and the load capacity, shortens the average effective time of the single-channel measurement and control, and improves the real-time efficiency of the measurement and control.

Description

A kind of temperature and humidity collection and detection device inside and outside a granary and its detection method

technical field

The invention relates to a detection device in the technical field of granary monitoring, in particular to a detection device for temperature and humidity inside and outside a granary, and a method for collecting and detecting temperature and humidity inside and outside the granary of the detection device.

Background technique

In the field of grain monitoring and control, in order to ensure the quality of the stored grain, the relevant departments attach great importance to the storage environment. In the process of grain storage, the most important indicators are the ambient temperature and humidity, so a device is needed to monitor the temperature and humidity inside and outside the granary. to ensure a suitable storage environment. After investigation, it was found that most of the current temperature and humidity monitoring equipment have mixed functions, some only support single-channel acquisition, and in a granary with a relatively large volume, they cannot meet the simultaneous operation of multiple temperature measurement cables; The method of data collection can not achieve the purpose of real-time collection; some products are relatively complicated in design and use, and cannot meet the requirements of easy installation, easy collection, and easy maintenance, so the on-site adaptability is poor. When the environmental monitoring equipment cannot well achieve the purpose of collecting data, it is impossible to monitor the environment in the granary in real time, so that the quality of the stored grain cannot be effectively guaranteed, which will inevitably affect the production efficiency of relevant departments and bring about loss.

At present, although various temperature and humidity monitoring devices have appeared in the domestic market, these devices generally have shortcomings such as cables being easily struck by lightning, sensors being burned, cumbersome operation, high price, and poor applicability. The most important thing is the existing Therefore, it is of great practical significance to design a low-cost, easy-to-operate and lightning-proof temperature and humidity acquisition device based on the characteristics of the granary.

SUMMARY OF THE INVENTION

In order to solve the technical problems of low measurement and control efficiency of the existing temperature and humidity detection equipment and long average measurement and control time of a single channel, the present invention provides a temperature and humidity acquisition and detection device inside and outside a granary and a detection method thereof.

The present invention adopts the following technical scheme to realize: a kind of temperature and humidity collection and detection device inside and outside the granary, which comprises:

Multiple detection devices;

A measurement and control cable, on which a plurality of detection devices are mounted;

A temperature and humidity measurement and control circuit, which includes a read data pin, a write data pin, a pull-up drive pin, a pull-down drive pin, a data pin, a non-inverting buffer line drive module, a current amplifying module 1, a circuit protection module, a current Amplifying module 2; the read data pin is connected to the output end of the non-inverting buffer line driver module, the write data pin is connected to the input end of the circuit protection module, and the pull-up drive leads The pin is connected to the input end of the current amplifying module 1, the pull-down driving pin is connected to the input end of the current amplifying module 2; the write data pin is connected to the non-inverting buffer line driving module. The input end, the output end of the first current amplification module, the output end of the circuit protection module, and the output end of the second current amplification module are connected to each other; the measurement and control cable is connected to the data pin; and

The input and output ends of the processor are connected to the read data pins, the write data pins, the pull-up drive pins, and the pull-down drive pins; when the read operation is performed, the processor first Turn on the pull-down drive pin, make the data pin output a low-level signal through the current amplification module 2, close the pull-down drive pin and open the pull-up drive pin, and amplify the current through the current As soon as the module makes the data pin output a high-level signal, and finally turns off the pull-up drive pin, the data pin generates a rising edge pulse to the detection device, and the detection device returns to the current data bit state , the processor responds to the response signal by reading the state of the read data pin, and realizes the data bit read operation; when performing the write operation, the processor first turns on the pull-down drive pin, and passes the current Amplifying module 2 makes the data pin output a low-level signal, then closes the pull-down drive pin, and finally performs: (1) when writing 1, open the pull-up drive pin, and amplify through the current Module one makes the data pin output a high-level signal, and finally closes the pull-up drive pin, so that the data pin generates a rising edge pulse to the detection device; (2) when writing 0, Continue to open the pull-down drive pin, make the data pin continuously output a low-level signal through the current amplification module 2, then close the pull-down drive pin, and finally open the pull-up drive pin, through all the As soon as the current amplifying module makes the data pin output a high-level signal, and then closes the pull-up drive pin, the detection device restores the current data bit state, and the processor realizes data through the read data pin. bit write operation.

The processor of the present invention realizes the read-write separation mechanism through each module and pin of the temperature and humidity measurement and control circuit. During the read operation, the processor first opens the pull-down drive pin and then opens the pull-up drive pin, generates a rising pulse on the data pin, and detects that the device returns the current data bit state, so that the processor reads the state of the read data pin by reading , reply the response signal, realize the data bit read operation. During a write operation, the processor first turns on the pull-down drive pin to generate a low-level signal, then closes the pull-down drive pin, and controls the pull-up drive pin and pull-down drive pin according to the different writing, to generate the corresponding demand level signal, and finally the detection device returns to the current data bit state, and the data bit write operation is realized by reading the data pin. In the processing of the measurement and control mechanism, the time division multiplexing method is used for multi-channel parallel acquisition, and different driving states are adjusted for data reading and writing, which improves the reliability of data communication, improves the load capacity of the temperature and humidity measurement and control circuit module, and shortens the single channel. The average effective time of measurement and control improves the real-time efficiency of measurement and control, and solves the technical problems of low measurement and control efficiency of the existing temperature and humidity detection equipment and long average measurement and control time of a single channel.

As a further improvement of the above scheme, the detection device further includes:

An isolation protection circuit is arranged between the temperature and humidity measurement and control circuit and the measurement and control cable.

Further, the isolation protection circuit includes a DS2413 chip; the data input pin of the DS2413 chip is connected to the data pin of the temperature and humidity measurement and control circuit, and the ground pin of the DS2413 chip is connected to the temperature and humidity measurement and control circuit. The ground pin of the DS2413 chip is connected; the processor selects the working mode of the DS2413 chip by writing a response signal, and the PIOA pin of the DS2413 chip is connected to the ground wire of the measurement and control cable; the data of the measurement and control cable The line is connected with the data pin of the temperature and humidity measurement and control circuit.

As a further improvement of the above scheme, the detection device further includes:

A communication module, which is used to receive configuration instructions and measurement and control instructions issued by a cloud server; the processor accesses the cloud server through the communication module, identifies and executes the measurement and control instructions issued by the cloud server to perform The environmental information collects measurement and control data; the processor identifies the state of the measurement and control cable online according to the measurement and control data, obtains the dead point position of at least one of the sensors, and reports the corresponding dead point position to a remote server through a cloud host Or upload directly to a cloud.

Further, the communication module includes a wired communication unit and a wireless communication unit; the wired communication unit is used for the processor to perform wired communication with the cloud server; the wireless communication unit is used for the processor to communicate with the cloud server. The cloud server communicates wirelessly.

As a further improvement of the above scheme, the detection device further includes:

A power supply module, which is used to rectify and stabilize the external input voltage through an internal voltage stabilizer to output a DC voltage, and convert the DC voltage through a linear voltage stabilizer to supply the temperature and humidity measurement and control circuit and the detection device. , the DC voltage is converted by a power regulator and supplied to the processor.

As a further improvement of the above scheme, the detection device further includes:

The serial number identification module is electrically connected to the processor and used to identify the serial number of the detection device.

As a further improvement of the above scheme, the measurement and control mechanism of the processor adopts the time division multiplexing method for multi-channel parallel acquisition, and establishes an independent task thread for the tasks that each acquisition port needs to perform, and each of the threads executes a task thread. The tasks in the task queue; the processor first allocates the resources of each of the threads according to the overall load capacity of the system, and then controls a plurality of the threads to perform synchronous and coordinated operation until all the tasks in the thread task queue are Complete, end this collection task, and finally upload the collected data to the cloud host or the cloud through the communication module after processing; the data processing mechanism of the processor is based on the root of the detection device on the measurement and control cable. The layer number is sorted, and when there is a need for the positioning of the corresponding point of the detection device, the two custom fields are used to configure the root layer information data of the detection device. The position of the detection device is quickly located, and the location and type of the fault point are quickly located by the method of data filtering; the processor automatically supplements a bad point according to the continuity of the root layer number; the processor system runs The mechanism is a watchdog mechanism of an independent window, and the test tasks are backed up and stored in real time.

Further, the communication module is provided with a three-wire USART serial communication port and a four-wire SPI communication port, the processor is an STM32 microprocessor, the non-inverting buffer line driver module is a 74hc1g125gv chip, and the The first and second current amplifying modules are both SS8050LT1_NPN chips, and the circuit protection module is S9012_sot23 chips.

Compared with the existing temperature and humidity detection equipment, the device for collecting and detecting the temperature and humidity inside and outside the granary of the present invention and the detection method thereof have the following beneficial effects:

1. The temperature and humidity acquisition and detection device inside and outside the granary realizes the read-write separation mechanism through each module and pin of the temperature and humidity measurement and control circuit. During the read operation, the processor first opens the pull-down drive pin and then opens the pull-up drive pin, generates a rising pulse on the data pin, and detects that the device returns the current data bit state, so that the processor reads the state of the read data pin by reading , reply the response signal, realize the data bit read operation. During a write operation, the processor first turns on the pull-down drive pin to generate a low-level signal, then closes the pull-down drive pin, and controls the pull-up drive pin and pull-down drive pin according to the different writing, to generate the corresponding demand level signal, and finally the detection device returns to the current data bit state, and the data bit write operation is realized by reading the data pin. In the processing of the measurement and control mechanism, the time division multiplexing method is used for multi-channel parallel acquisition, and different driving states are adjusted for data reading and writing, which improves the reliability of data communication, improves the load capacity of the temperature and humidity measurement and control circuit module, and shortens the single channel. The average effective time of measurement and control improves the real-time efficiency of measurement and control. The device increases the transmission distance of serial data by means of multi-stage drive amplification, which can increase the upper limit of the number of sensors mounted on a single channel, expand the coverage of single-channel measurement and control cables, reduce measurement and control detection convergence points, improve the reliability of data communication, reduce equipment cost.

2. The temperature and humidity acquisition and detection device inside and outside the granary is designed with an isolation protection circuit between the temperature and humidity measurement and control circuit and the measurement and control cable. The isolation protection circuit disconnects the temperature and humidity measurement and control circuit and the public ground of the measurement and control cable for a long time to avoid the measurement and control line. The sensor on the cable runs continuously, thereby reducing the damage rate and protecting the measurement and control cable, which can reduce the risk of burning the measurement and control cable when the equipment works abnormally.

3. The temperature and humidity acquisition and detection device inside and outside the granary, in the processing of the measurement and control mechanism, gets rid of the single-threaded measurement and control mechanism of the traditional measurement and control unit, adopts the idea of time division multiplexing, and establishes an independent task for each acquisition port. Each thread executes a task in a task queue. The CPU allocates each thread resource according to the overall load capacity of the system, and controls multiple threads to run synchronously and coordinated until all the tasks in the thread task queue are completed. The second acquisition task is to process the collected data and upload it to the cloud host or cloud through the interface communication module. The device can shorten the average effective time of single-channel measurement and control by optimizing the operation of the measurement and control mechanism, and improve the real-time efficiency of measurement and control.

4. The temperature and humidity acquisition and detection device inside and outside the granary is compatible with two modes of real-time acquisition and timed uploading in the design of the acquisition module. In the real-time mode, real-time data collection and uploading is performed by responding to the measurement and control instructions from the cloud host or cloud server in real time; in the timing mode, the environmental data is collected regularly, stored locally, and in response to the measurement and control instructions from the cloud host or cloud server, immediately The command reply is more timely. There are two methods of real-time and timed temperature measurement, which can be modified and confirmed through configuration instructions to adapt to the measurement and control requirements in different environments.

5. The temperature and humidity acquisition and detection device inside and outside the granary, in the data processing mechanism, can sort the root layer numbers of the detection devices in the measurement and control cable according to customer needs. In the field where there is a need for positioning the corresponding point of the detection device, use two user-defined fields to configure the root layer information data of the detection device, and quickly locate the position of the detection device according to the root layer information during collection, and can filter the data. The method can quickly locate the location and type of the fault point. According to the continuity of the root layer number of the detection device, the bad points are automatically added to ensure the continuity of the data. When a bad point occurs, the location and number of the uploaded bad points can be quickly located and fault eliminated.

6. The temperature and humidity acquisition and detection device inside and outside the granary, in the system operation mechanism, uses the watchdog mechanism of an independent window to avoid equipment crash, and through the method of real-time backup and storage of test tasks to ensure that the equipment can continue to execute even when the equipment is restarted abnormally. measurement and control tasks. The watchdog of the independent window keeps monitoring status at all times when the system is running, which can prevent the system from entering an infinite loop or long-term CPU occupancy due to a thread being stuck. At the same time, the system backs up the measurement and control tasks and the current operating status of the system in real time during operation, so as to avoid the system being able to quickly resume work during abnormal restart, and ensure the continuous effectiveness and stable performance of the system operation.

7. The temperature and humidity acquisition and detection device inside and outside the granary uses an industrial-grade single-chip microcomputer with a high processing rate as the core control unit, which can effectively ensure the operation processing speed, anti-interference and stability of the on-site measurement and control system; the modular design scheme is adopted to enhance the Due to the versatility, stability and portability of the device, in actual production, it can be applied to a variety of temperature and humidity measurement and control environments.

8. The method for collecting and detecting temperature and humidity inside and outside the granary has the same beneficial effects as the above-mentioned device for collecting and detecting temperature and humidity inside and outside the granary, and will not be repeated here.

Description of drawings

FIG. 1 is an overall topology structure diagram of the temperature and humidity collection and detection device inside and outside the granary according to Embodiment 1 of the present invention.

FIG. 2 is a schematic diagram of the temperature and humidity measurement and control circuit of the temperature and humidity acquisition and detection device inside and outside the granary in FIG. 1 .

FIG. 3 is a topological structure diagram of the isolation protection circuit of the temperature and humidity acquisition and detection device inside and outside the granary in FIG. 1 .

FIG. 4 is a schematic diagram of the isolation protection circuit of the temperature and humidity collection and detection device inside and outside the granary in FIG. 1 .

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1

Referring to FIG. 1 , this embodiment provides a device for collecting and detecting temperature and humidity inside and outside the granary. The device is used in temperature detection inside and outside the granary, and the detected data can be transmitted to the background. The detection device includes a detection device, a measurement and control cable, a temperature and humidity measurement and control circuit, a processor, an isolation protection circuit, a communication module, a power supply module and a serial number identification module. Some of these modules can be grouped together, or a single module can be split into multiple units with different functions.

The number of detection devices is multiple, and the detection devices generally use sensors. The detection devices can adopt existing sensor devices, and these detection devices are arranged inside and outside the granary, and can detect the temperature information and humidity information inside and outside the granary in real time. The detection device can use a temperature sensor and a humidity sensor, or an integrated temperature and humidity sensor. Among them, a plurality of detection devices are mounted on the measurement and control cables. In this embodiment, the measurement and control cable and the corresponding detection device may form a sensor cable, such as a DS18B20 cable. In this way, each sensor cable can be arranged in a certain area, and the area can be detected.

Please refer to Figure 2, the temperature and humidity measurement and control circuit is provided with a drive circuit, and the drive circuit includes a read data pin, a write data pin, a pull-up drive pin, a pull-down drive pin, a data pin, and a non-inverting buffer line drive module , Current amplifier module one, circuit protection module, current amplifier module two. The read data pin is connected to the output end of the non-inverting buffer line driver module, the write data pin is connected to the input end of the circuit protection module, the pull-up drive pin is connected to the input end of the current amplifying module 1, and the pull-down drive pin is connected to the input end of the current amplifier module 1. The pin is connected to the input end of the current amplifying module 2. The write data pin is connected to the input end of the non-inverting buffer line driving module, the output end of the current amplifying module 1, the output end of the circuit protection module, and the output end of the current amplifying module 2. The measurement and control cable is connected to the data pin.

In this embodiment, the non-inverting buffer line driver module is a 74hc1g125gv chip, the first current amplifying module and the second current amplifying module are both SS8050LT1_NPN chips, and the circuit protection module is an S9012_sot23 chip. The four pins of WireIn1, WirePu1, WirePd1, and WireOut1 are respectively connected to the I/O pins of the processor. WireIn1 is the read data pin, WireOut1 is the write data pin, WirePu1 pull-up drive pin, WirePd1 pull-down drive pin . The 74hc1g125gv chip provides a non-inverting buffer line driver, which is used as a high-impedance shutdown state; the WirePu1 pull-up pin is connected to the SS8050LT1_NPN chip to amplify the weak signal into an electrical signal with a higher amplitude, which can amplify the current; The WirePd1 pull-down pin is also connected to the SS8050LT1_NPN chip; the WireOut1 output pin is connected to the S9012_sot23 chip, which acts as a protection circuit. When the 1N4148 and SS14 are reversely broken down, a high reverse electromotive force will be generated to protect the circuit Device; dp1 is the data pin, connected to the cable, used for writing one-wire commands and reading detection data. When the processor performs a read operation, it first turns on WirePd1, so that dp1 outputs a low-level signal, then closes WirePd1 and turns on WirePu1, makes dp1 output a high-level signal, and finally turns off WirePu1, so that a short rising edge pulse is generated on the bus dp1 , the device mounted under this drive circuit replies to the current data bit state through the one-wire response mechanism, and the processor reads the current WireIn1 state and replies the response signal to complete the data bit read operation. When the processor performs a write operation, it first turns on WirePd1, so that dp1 outputs a low-level signal, then closes WirePd1, when writing 1, turns on WirePu1, makes dp1 output a high-level signal, and finally closes WirePu1, so that the bus dp1 Generate a short rising edge pulse; when writing 0, continue to open WirePd1, make dp1 output a long-term low-level signal, then close WirePd1, and finally continue to open WirePu1, make dp1 output a high-level signal, and then close WirePu1, The device mounted on this drive circuit replies to the current data bit status through the one-wire response mechanism, and the processor completes the data bit write operation through WireOut1.

Please refer to Figure 3 and Figure 4, the isolation protection circuit is set between the temperature and humidity measurement and control circuit and the measurement and control cable. In this embodiment, the isolation protection circuit includes a DS2413 chip. The data input pin of the DS2413 chip is connected with the data pin of the temperature and humidity measurement and control circuit, and the ground pin of the DS2413 chip is connected with the ground pin of the temperature and humidity measurement and control circuit. The processor selects the working mode of the DS2413 chip by writing the response signal, and the PIOA pin of the DS2413 chip is connected to the ground wire of the measurement and control cable. The data line of the measurement and control cable is connected to the data pin of the temperature and humidity measurement and control circuit.

In this embodiment, the data input pins Dp and GND of the chip DS2413 are electrically connected to the data input pins dp1 and GND of the temperature and humidity measurement and control circuit module, respectively, and the processor writes the one-wire response signal to the DS2413. The selection of the working mode, the corresponding level signal is output through the PIOA pin. The PIOA pin of the DS2413 chip is electrically connected to the cable GND, which is used to realize the control of the electrical connection between the acquisition board GND and the cable GND, as a hardware switch for the electrical connection of the cable. The DATA of the measurement and control cable is electrically connected to the data input pin of the temperature and humidity measurement and control circuit module. When measurement and control is required, the processor writes a one-wire response signal through this port to open the connection between the measurement and control cable and the temperature and humidity measurement and control circuit module. The electrical connection is made, and then the measurement and control instructions are sent for data collection. After the acquisition is completed, the processor writes the one-wire response signal again through this port, and disconnects the electrical connection between the measurement and control cable and the temperature and humidity measurement and control circuit module, so as to protect the measurement and control cable and reduce the abnormal operation of the equipment. risk of burning the measurement and control cables.

The communication module is used to receive configuration instructions and measurement and control instructions from a cloud server. The processor is connected to the cloud server through the communication module, and recognizes and executes the measurement and control instructions issued by the cloud server to collect the measurement and control data of environmental information. The processor identifies the state of the measurement and control cable online according to the measurement and control data, obtains the dead spot position of at least one of the sensors, and reports the corresponding dead spot position to a remote server or directly to a cloud through a cloud host. Wherein, the communication module includes an electrostatic protection circuit, a wired communication unit and a wireless communication unit. The wired communication unit is used for wired communication between the processor and the cloud server. The wireless communication unit is used for wireless communication between the processor and the cloud server. Take the LoRa radio frequency module as an example for wireless communication. The LoRa radio frequency module SX1278 uploads data to the cloud server through the gateway. The effective communication distance can reach 5 kilometers, which can solve the difficult problem of on-site wiring and reduce costs. The communication module is the communication bridge between the cloud server and the acquisition board, including the acquisition and configuration instructions issued by the cloud server and the uploading of temperature and humidity data. The circuit design adopts a combination of balanced driver and differential receiver, which greatly enhances the anti-interference ability, effectively expands the communication distance and application range, and has multi-point and two-way communication capabilities. The electrostatic protection circuit design can effectively prevent the internal disorder of the sensor due to the generation of static electricity, resulting in the sensor not working, and the electrostatic protection ensures the validity and accuracy of the data. Of course, the communication mode of the communication module can also be wired 485, optical fiber or wireless radio frequency, but it is not limited to the above-mentioned methods. The interface conversion is performed through the serial port, which is compatible with various measurement and control scenarios. The communication module and the processor can communicate through serial communication.

In this embodiment, the communication module is mainly used for data interaction between the detection device of this embodiment and the cloud host, receives configuration instructions and measurement and control instructions from the cloud server, and uploads measurement and control data of the detection device. The communication module is equipped with a three-wire USART serial communication port and a four-wire SPI communication port, of which the three-wire USART serial communication port can measure and control the short-distance RS232, medium and long-distance RS485 and the original distance optical fiber transmission through on-site monitoring and control. , suitable for various low-speed measurement and control scenarios. The SPI communication port can realize high-speed transmission of medium and long distances through Ethernet, optical fiber, and wireless communication modules.

The power supply module is used to rectify and stabilize the external input voltage through an internal voltage stabilizer to output a DC voltage, and convert the DC voltage through a linear voltage stabilizer to supply the temperature and humidity measurement and control circuit and detection devices. The DC voltage is converted and supplied to the processor. In this embodiment, the power supply module adopts DC 5V power supply, rectifies and stabilizes the input voltage through a voltage stabilizer, outputs a DC voltage, and then converts it through a linear LDO, and outputs a stable DC 5V to supply the measurement and control equipment. The 3.3V voltage is stably output by the power regulator to supply power to the microprocessor. In the circuit design of the power module, the input capacitor can effectively prevent the voltage inversion phenomenon after power failure, and the filter capacitor can suppress the self-oscillation and stabilize the output voltage. effect.

The serial number identification module is electrically connected to the processor and used to identify the serial number of the detection device. The number identification module can be convenient for the outside, especially the cloud server to identify the number of the detection device, and can accurately encode the information of the detection device. In this way, when the space of the granary is very large and the number of detection devices is larger, the serial number identification module can be used as the ID card of the detection device, so that the detected data can be accurately collected in the background or cloud server for easy management.

The input and output terminals of the processor are connected with the read data pin, the write data pin, the pull-up drive pin and the pull-down drive pin. Among them, the processor is STM32 microprocessor, which is composed of STM32 series single-chip microcomputer with Cortex-M3 as the core and peripheral circuits. It has the characteristics of high performance, low cost and low power consumption, and is suitable for on-site environmental data acquisition and processing, data communication. with device regulation.

When performing a read operation, the processor first turns on the pull-down drive pin, makes the data pin output a low-level signal through the second current amplification module, then closes the pull-down drive pin and opens the pull-up drive pin, and through the current amplification module 1 makes the data pin output a low level signal. The data pin outputs a high-level signal, and finally the pull-up drive pin is turned off, so that the data pin generates a rising edge pulse to the detection device, and the detection device returns to the current data bit state. The processor reads the state of the data pin by reading, Reply the response signal to realize the data bit read operation.

When performing a write operation, the processor first turns on the pull-down drive pin, makes the data pin output a low-level signal through the second current amplification module, then closes the pull-down drive pin, and finally performs: (1) When writing 1, turn it on Pull up the drive pin, through the current amplification module, the data pin outputs a high-level signal, and finally close the pull-up drive pin, so that the data pin generates a rising edge pulse to the detection device. (2) When writing 0, continue to open the pull-down drive pin, make the data pin continue to output a low-level signal through the second current amplification module, then close the pull-down drive pin, and finally open the pull-up drive pin, and amplify the current through the current As soon as the module makes the data pin output a high-level signal, and then closes the pull-up drive pin, the detection device returns to the current data bit state, and the processor implements the data bit write operation by reading the data pin.

In order to improve the working efficiency of the measurement and control device of this example, the measurement and control mechanism, acquisition mode, data processing method and system operation mechanism have been optimized to make the software and hardware of the detection device of this example run in coordination and improve the overall work efficiency of the device. In the processing of the measurement and control mechanism, the measurement and control device of this embodiment gets rid of the single-threaded measurement and control mechanism of the traditional measurement and control unit. The measurement and control mechanism of the processor adopts the time division multiplexing method for multi-channel parallel acquisition, and establishes the tasks that each acquisition port needs to perform. A separate task thread, each executing a task in a task queue. The processor first allocates the resources of each thread according to the overall load capacity of the system, and then controls multiple threads to perform synchronous and coordinated operation until all the tasks in the thread task queue are completed, ending the collection task, and finally processing the collected data. Upload to the cloud host or cloud through the communication module. The average effective time of single-channel measurement and control can be shortened and the real-time efficiency of measurement and control can be improved by optimizing the operation measurement and control mechanism.

In the design of the acquisition module, the detection device of this embodiment is compatible with two modes of real-time acquisition and timing upload. In real-time mode, real-time data collection and upload are performed by responding to the measurement and control instructions from the cloud host or cloud server in real time. In timing mode, environmental data is collected periodically, stored locally, and responds to the measurement and control instructions from the cloud host or cloud server, and immediately responds to instructions, which is more time-efficient. There are two methods of real-time and timed temperature measurement, which can be modified and confirmed through configuration instructions to adapt to the measurement and control requirements in different environments.

The data processing mechanism of the processor is to sort and process according to the root layer number of the detection device on the measurement and control cable. When there is a need to locate the corresponding point of the detection device, use two custom fields to configure the root layer information data of the detection device. , and quickly locate the position of the detection device according to the root layer information data during collection, and quickly locate the location and type of the fault point by means of data filtering. The processor automatically adds a dead pixel according to the continuity of the root layer number. Taking the traditional temperature measurement DS18B20 temperature sensor as an example, in the field where there is a need for the positioning of the corresponding point of the sensor, the root layer information data of the sensor is configured by using two user-defined fields, and the location of the sensor is quickly performed according to the root layer information during collection. Locate, and can quickly locate the location and type of fault points through data filtering. According to the continuity of the root layer number, the bad points are automatically added to ensure the continuity of the data. When a bad point occurs, the location and number of the uploaded bad points can be quickly located and fault eliminated.

The system operating mechanism of the processor is a watchdog mechanism of an independent window, and the test tasks are backed up and stored in real time. In this way, the equipment can be prevented from crashing, and the measurement and control tasks can continue to be performed when the equipment restarts abnormally by means of real-time backup and storage of test tasks. The watchdog of the independent window keeps monitoring status at all times when the system is running, which can prevent the system from entering an infinite loop or long-term CPU occupancy due to a thread being stuck. At the same time, the system backs up the measurement and control tasks and the current operating status of the system in real time during operation, so as to avoid the system being able to quickly resume work during abnormal restart, and ensure the continuous effectiveness and stable performance of the system operation.

To sum up, the device for collecting and detecting the temperature and humidity inside and outside the granary of this embodiment has the following advantages:

1. The temperature and humidity acquisition and detection device inside and outside the granary realizes the read-write separation mechanism through each module and pin of the temperature and humidity measurement and control circuit. During the read operation, the processor first opens the pull-down drive pin and then opens the pull-up drive pin, generates a rising pulse on the data pin, and detects that the device returns the current data bit state, so that the processor reads the state of the read data pin by reading , reply the response signal, realize the data bit read operation. During a write operation, the processor first turns on the pull-down drive pin to generate a low-level signal, then closes the pull-down drive pin, and controls the pull-up drive pin and pull-down drive pin according to the different writing, to generate the corresponding demand level signal, and finally the detection device returns to the current data bit state, and the data bit write operation is realized by reading the data pin. In the processing of the measurement and control mechanism, the time division multiplexing method is used for multi-channel parallel acquisition, and different driving states are adjusted for data reading and writing, which improves the reliability of data communication, improves the load capacity of the temperature and humidity measurement and control circuit module, and shortens the single channel. The average effective time of measurement and control improves the real-time efficiency of measurement and control. The device increases the transmission distance of serial data by means of multi-stage drive amplification, which can increase the upper limit of the number of sensors mounted on a single channel, expand the coverage of single-channel measurement and control cables, reduce measurement and control detection convergence points, improve the reliability of data communication, reduce equipment cost.

2. The temperature and humidity acquisition and detection device inside and outside the granary is designed with an isolation protection circuit between the temperature and humidity measurement and control circuit and the measurement and control cable. The isolation protection circuit disconnects the temperature and humidity measurement and control circuit and the public ground of the measurement and control cable for a long time to avoid the measurement and control line. The sensor on the cable runs continuously, thereby reducing the damage rate and protecting the measurement and control cable, which can reduce the risk of burning the measurement and control cable when the equipment works abnormally.

3. The temperature and humidity acquisition and detection device inside and outside the granary, in the processing of the measurement and control mechanism, gets rid of the single-threaded measurement and control mechanism of the traditional measurement and control unit, adopts the idea of time division multiplexing, and establishes an independent task for each acquisition port. Each thread executes a task in a task queue. The CPU allocates each thread resource according to the overall load capacity of the system, and controls multiple threads to run synchronously and coordinated until all the tasks in the thread task queue are completed. The second acquisition task is to process the collected data and upload it to the cloud host or cloud through the interface communication module. The device can shorten the average effective time of single-channel measurement and control by optimizing the operation of the measurement and control mechanism, and improve the real-time efficiency of measurement and control.

4. The temperature and humidity acquisition and detection device inside and outside the granary is compatible with two modes of real-time acquisition and timed uploading in the design of the acquisition module. In the real-time mode, real-time data collection and uploading is performed by responding to the measurement and control instructions from the cloud host or cloud server in real time; in the timing mode, the environmental data is collected regularly, stored locally, and in response to the measurement and control instructions from the cloud host or cloud server, immediately The command reply is more timely. There are two methods of real-time and timed temperature measurement, which can be modified and confirmed through configuration instructions to adapt to the measurement and control requirements in different environments.

5. The temperature and humidity acquisition and detection device inside and outside the granary, in the data processing mechanism, can sort the root layer numbers of the detection devices in the measurement and control cable according to customer needs. In the field where there is a need for positioning the corresponding point of the detection device, use two user-defined fields to configure the root layer information data of the detection device, and quickly locate the position of the detection device according to the root layer information during collection, and can filter the data. The method can quickly locate the location and type of the fault point. According to the continuity of the root layer number of the detection device, the bad points are automatically added to ensure the continuity of the data. When a bad point occurs, the location and number of the uploaded bad points can be quickly located and fault eliminated.

6. The temperature and humidity acquisition and detection device inside and outside the granary, in the system operation mechanism, uses the watchdog mechanism of an independent window to avoid equipment crash, and through the method of real-time backup and storage of test tasks to ensure that the equipment can continue to execute even when the equipment is restarted abnormally. measurement and control tasks. The watchdog of the independent window keeps monitoring status at all times when the system is running, which can prevent the system from entering an infinite loop or long-term CPU occupancy due to a thread being stuck. At the same time, the system backs up the measurement and control tasks and the current operating status of the system in real time during operation, so as to avoid the system being able to quickly resume work during abnormal restart, and ensure the continuous effectiveness and stable performance of the system operation.

7. The temperature and humidity acquisition and detection device inside and outside the granary uses an industrial-grade single-chip microcomputer with a high processing rate as the core control unit, which can effectively ensure the operation processing speed, anti-interference and stability of the on-site measurement and control system; the modular design scheme is adopted to enhance the Due to the versatility, stability and portability of the device, in actual production, it can be applied to a variety of temperature and humidity measurement and control environments.

Example 2

This embodiment provides a method for collecting and detecting the temperature and humidity inside and outside the granary, and the method is applied to the device for collecting and detecting the temperature and humidity inside and outside the granary in Embodiment 1. Wherein, the detection method includes the following steps:

When performing a read operation, first open the pull-down drive pin, make the data pin output a low-level signal through the second current amplifier module, then close the pull-down drive pin and open the pull-up drive pin, and make the data lead through the first current amplifier module. The pin outputs a high-level signal, and finally closes the pull-up drive pin, so that the data pin generates a rising edge pulse to the detection device, and the detection device returns the current data bit state, and the processor responds by reading the state of the read data pin. Signal to realize data bit read operation;

When performing a write operation, first open the pull-down drive pin, make the data pin output a low-level signal through the second current amplification module, then close the pull-down drive pin, and finally: (1) When writing 1, open the pull-up Drive pin, the data pin outputs a high-level signal through the current amplification module, and finally turns off the pull-up drive pin, so that the data pin generates a rising edge pulse to the detection device; (2) When writing 0, continue Turn on the pull-down drive pin, make the data pin output a low-level signal continuously through the second current amplifier module, then close the pull-down drive pin, and finally open the pull-up drive pin, and make the data pin output a high level through the first current amplifier module signal, and then turn off the pull-up drive pin, detect the device to restore the current data bit state, and realize the data bit write operation by reading the data pin.

Example 3

This embodiment provides a computer terminal, which includes a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the program, the steps of the method for collecting and detecting the temperature and humidity inside and outside the granary of Embodiment 2 are implemented. When the method of Embodiment 2 is applied, it can be applied in the form of software, such as a program designed to run independently and installed on a computer terminal. The computer terminal can be a computer, a smart phone, a control system, and other Internet of Things devices. The method of Embodiment 2 can also be designed as an embedded running program, which is installed on a computer terminal, such as a single-chip microcomputer.

Example 4

This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by the processor, the steps of the method for collecting and detecting the temperature and humidity inside and outside the granary of Embodiment 2 are implemented. When the method of Embodiment 2 is applied, it can be applied in the form of software, such as a program designed as a computer-readable storage medium that can run independently, and the computer-readable storage medium can be a USB flash drive, designed as a USB shield, and designed as a USB flash drive. The program that starts the entire method by an external trigger.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. A temperature and humidity collection and detection device inside and outside a granary, is characterized in that, it comprises: Multiple detection devices; A measurement and control cable, on which a plurality of detection devices are mounted; A temperature and humidity measurement and control circuit, which includes a read data pin, a write data pin, a pull-up drive pin, a pull-down drive pin, a data pin, a non-inverting buffer line drive module, a current amplifying module 1, a circuit protection module, a current Amplifying module 2; the read data pin is connected to the output end of the non-inverting buffer line driver module, the write data pin is connected to the input end of the circuit protection module, and the pull-up drive leads The pin is connected to the input end of the current amplifying module 1, the pull-down driving pin is connected to the input end of the current amplifying module 2; the write data pin is connected to the non-inverting buffer line driving module. The input end, the output end of the first current amplification module, the output end of the circuit protection module, and the output end of the second current amplification module are connected to each other; the measurement and control cable is connected to the data pin; and The input and output ends of the processor are connected to the read data pins, the write data pins, the pull-up drive pins, and the pull-down drive pins; when the read operation is performed, the processor first Turn on the pull-down drive pin, make the data pin output a low-level signal through the current amplification module 2, close the pull-down drive pin and open the pull-up drive pin, and amplify the current through the current As soon as the module makes the data pin output a high-level signal, and finally turns off the pull-up drive pin, the data pin generates a rising edge pulse to the detection device, and the detection device returns to the current data bit state , the processor responds to the response signal by reading the state of the read data pin, and realizes the data bit read operation; when performing the write operation, the processor first turns on the pull-down drive pin, and passes the current Amplifying module 2 makes the data pin output a low-level signal, then closes the pull-down drive pin, and finally performs: (1) when writing 1, open the pull-up drive pin, and amplify through the current Module one makes the data pin output a high-level signal, and finally closes the pull-up drive pin, so that the data pin generates a rising edge pulse to the detection device; (2) when writing 0, Continue to open the pull-down drive pin, make the data pin continuously output a low-level signal through the current amplification module 2, then close the pull-down drive pin, and finally open the pull-up drive pin, through all the As soon as the current amplifying module makes the data pin output a high-level signal, and then closes the pull-up drive pin, the detection device restores the current data bit state, and the processor realizes data through the read data pin. bit write operation. 2. The device for collecting and detecting temperature and humidity inside and outside the granary according to claim 1, wherein the detecting device further comprises: An isolation protection circuit is arranged between the temperature and humidity measurement and control circuit and the measurement and control cable. 3. The device for collecting and detecting temperature and humidity inside and outside a granary according to claim 2, wherein the isolation protection circuit comprises a DS2413 chip; the data input pins of the DS2413 chip and the data of the temperature and humidity measurement and control circuit The pins are connected to each other, and the ground pin of the DS2413 chip is connected to the ground pin of the temperature and humidity measurement and control circuit; the processor selects the working mode of the DS2413 chip by writing a response signal, and the The PIOA pin is connected to the ground wire of the measurement and control cable; the data wire of the measurement and control cable is connected to the data pin of the temperature and humidity measurement and control circuit. 4. The device for collecting and detecting temperature and humidity inside and outside the granary according to claim 1, wherein the detecting device further comprises: A communication module, which is used to receive configuration instructions and measurement and control instructions issued by a cloud server; the processor accesses the cloud server through the communication module, identifies and executes the measurement and control instructions issued by the cloud server to perform The environmental information collects measurement and control data; the processor identifies the state of the measurement and control cable online according to the measurement and control data, obtains the dead point position of at least one of the sensors, and reports the corresponding dead point position to a remote server through a cloud host Or upload directly to a cloud. 5. The device for collecting and detecting temperature and humidity inside and outside a granary according to claim 4, wherein the communication module comprises a wired communication unit and a wireless communication unit; the wired communication unit is used for the processor to communicate with the The cloud server performs wired communication; the wireless communication unit is used for the processor to perform wireless communication with the cloud server. 6. The device for collecting and detecting temperature and humidity inside and outside the granary according to claim 1, wherein the detecting device further comprises: A power supply module, which is used to rectify and stabilize the external input voltage through an internal voltage stabilizer to output a DC voltage, and convert the DC voltage through a linear voltage stabilizer to supply the temperature and humidity measurement and control circuit and the detection device. , the DC voltage is converted by a power regulator and supplied to the processor. 7. The device for collecting and detecting temperature and humidity inside and outside a granary according to claim 1, wherein the detecting device further comprises: The serial number identification module is electrically connected to the processor and used to identify the serial number of the detection device. 8. The device for collecting and detecting temperature and humidity inside and outside a granary according to claim 1, wherein the measurement and control mechanism of the processor adopts a time-division multiplexing method for multi-channel parallel collection, and the tasks that each collection port needs to perform are collected. An independent task thread is established, and each of the threads executes a task in a task queue; the processor first allocates the resources of each of the threads according to the overall load capacity of the system, and then controls a plurality of the threads to perform tasks. Synchronous and coordinated operation until all the tasks in the thread task queue are completed, ending this collection task, and finally uploading the collected data to the cloud host or the cloud through the communication module after processing; the processor The data processing mechanism is to sort and process according to the root layer number of the detection device on the measurement and control cable. When there is a need for positioning the corresponding point of the detection device, use two custom fields to configure the detection device. When collecting the root layer information data, the position of the detection device is quickly located according to the root layer information data, and the location and type of the fault point are quickly located by the method of data filtering; the processor is based on the root layer number. Continuity, automatically supplementing a dead pixel; the system operating mechanism of the processor is a watchdog mechanism of an independent window, and the test tasks are backed up and stored in real time. 9. The device for collecting and detecting temperature and humidity inside and outside a granary according to claim 4, wherein the communication module is provided with a three-wire USART serial communication port and a four-wire SPI communication port, and the processor is STM32 microprocessor, the non-inverting buffer line driver module is a 74hc1g125gv chip, the first current amplifying module and the second current amplifying module are both SS8050LT1_NPN chips, and the circuit protection module is an S9012_sot23 chip. 10. A method for collecting and detecting temperature and humidity inside and outside a granary, which is applied to the device for collecting and detecting temperature and humidity inside and outside the granary as claimed in any one of claims 1-9, characterized in that it comprises the following steps: When performing the read operation, firstly open the pull-down drive pin, make the data pin output a low-level signal through the second current amplification module, then close the pull-down drive pin and open the pull-up drive pin Through the current amplification module, the data pin outputs a high-level signal, and finally the pull-up driving pin is turned off, so that the data pin generates a rising edge pulse to the detection device, and the The detection device replies to the current data bit state, and the processor replies the response signal by reading the state of the read data pin to realize the data bit read operation; When performing the write operation, first open the pull-down drive pin, make the data pin output a low-level signal through the second current amplification module, then close the pull-down drive pin, and finally: (1) when When writing 1, open the pull-up drive pin, make the data pin output a high-level signal through the current amplification module, and finally close the pull-up drive pin, so that the data pin is generated. A rising edge pulse to the detection device; (2) when writing 0, continue to open the pull-down drive pin, make the data pin continue to output a low-level signal through the current amplification module 2, and then close The pull-down drive pin is finally turned on, and the data pin outputs a high-level signal through the current amplification module, and then the pull-up drive pin is closed, and the detection device The current data bit state is returned, and the data bit write operation is realized through the read data pin.

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