CN104729576A - Temperature and humidity transmitter - Google Patents

Abstract

A temperature and humidity transmitter adopts embedded technology and sensor technology to read ambient temperature and humidity information from a digital temperature and humidity sensor, convert it into a corresponding analog voltage, and output the temperature and humidity information through serial port communication. The temperature and humidity transmitter includes: a main control module (1); a temperature and humidity sensor module (2); a D/A conversion module (3); a serial port communication module (4); a liquid crystal display module (5); module (6). The invention adopts a new generation of embedded processor STM32F103VE as the main control chip, combines the temperature and humidity sensor and the D/A conversion circuit, and jointly completes the conversion and display function of the digital temperature and humidity signal to the analog voltage signal, and has stable performance, simple structure, The feature of low price has certain application and promotion value.

Description

A temperature and humidity transmitter

technical field

The invention relates to a temperature and humidity transmitter. Specifically, a new generation of embedded processor STM32F103VE is used as the control core, combined with a temperature and humidity sensor, and through the design of software and hardware, the detection of temperature and humidity information in the environment and the simulation of voltage are completed. output.

Background technique

At present, the collection and detection of temperature and humidity are the most common and typical control items in agricultural science and technology, scientific experiments, and industrial manufacturing. Modern temperature and humidity collection technology has changed from low management, low level, and poor monitoring environment conditions at the beginning to large-scale, specialized, high-tech, and automated production of modern facility horticulture and modern greenhouses. The temperature and humidity transmitter uses high-quality digital integrated sensors as probes, equipped with reliable digital processing circuits, so as to convert the temperature and relative humidity in the environment into corresponding standard analog signals, 4-20mA or 0 -5V, it can reliably monitor and control with the upper computer system. It has the characteristics of small size, light weight, wide range, high precision, fast response speed and good long-term working stability, making it widely used in meteorology, national defense, scientific research, post and telecommunications, chemical industry, environmental protection, medicine, hotels, food and other materials Warehousing, HVAC and other fields that need to measure and control the temperature and humidity in the air.

The temperature and humidity transmitter of the present invention combines embedded technology and sensor technology to jointly complete the analog signal output of temperature and humidity information, has the advantages of low cost, good performance, and simple operation, and has certain market promotion value.

Contents of the invention

The technical problem to be solved by the present invention is to provide a temperature and humidity transmitter with low cost, simple structure and easy promotion.

The technical solution adopted in the present invention is: a temperature and humidity transmitter, which has a main control module (1), and also includes a temperature and humidity sensor module (2) connected to the main control module (1); ) connected to the D/A conversion module (3); the serial port communication module (4) connected to the main control module (1); the liquid crystal display module (5) connected to the main control module (1); and the main control module (1) ) connected power module (6).

The main control module (1) adopts a new-generation embedded processor STM32F103VE chip, which is the control core of the entire temperature and humidity transmitter, responsible for the collection of temperature and humidity information in the environment and the conversion of digital signals to analog signals.

The temperature and humidity sensor module (2) adopts a digital temperature and humidity sensor DHT11 to realize the detection of temperature and humidity information in the environment.

The D/A conversion module (3) is composed of a built-in D/A converter and an auxiliary circuit inside the main control module (1), and is used for converting digital temperature and humidity information into analog voltage values.

The serial port communication module (4) adopts a MAX232 serial port level conversion chip, which is used to convert TTL level signals into RS232 level signals to realize serial communication of data.

The liquid crystal display module (5) adopts a 2.4-inch liquid crystal display screen for displaying the collected digital temperature and humidity values and the converted analog voltage values.

The power supply module (6) is used to provide system power to make the system work normally.

Description of drawings

Figure 1 is the overall block diagram of the temperature and humidity transmitter;

Fig. 2 is a circuit schematic diagram of the temperature and humidity sensor module of the temperature and humidity transmitter;

Figure 3 is the circuit schematic diagram of the D/A conversion module of the temperature and humidity transmitter;

Fig. 4 is a schematic circuit diagram of the serial port communication module of the temperature and humidity transmitter.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and example.

A temperature and humidity transmitter of the present invention adopts a new generation of embedded processor STM32F1203VE as the control core, and is equipped with corresponding temperature and humidity sensor modules (2), D/A conversion modules (3), and serial port communication modules (4) on the periphery , a liquid crystal display module (5) and a power supply module (6), which jointly complete the detection of temperature and humidity information in the environment and the output of analog voltage.

As shown in Figure 1, a kind of temperature and humidity transmitter of the present invention has main control module (1), also comprises the temperature and humidity sensor module (2) that links to each other with main control module (1); ) connected to the D/A conversion module (3); the serial port communication module (4) connected to the main control module (1); the liquid crystal display module (5) connected to the main control module (1); and the main control module (1) ) connected power module (6). .

As shown in Figure 2, temperature and humidity sensor module (2) of the present invention adopts digital temperature and humidity sensor DHT11, carries out data transmission with main control module (1) by single-bus communication mode, and its data pin DATA and main control module ( 1) connected to the PD3 interface for the collection and transmission of temperature and humidity information.

As shown in Figure 3, the D/A conversion module (3) of the present invention is composed of a D/A converter and an auxiliary circuit inside the main control module (1). The auxiliary circuit is composed of two amplifiers U1 and U2. The control module (1) outputs the converted analog voltage value to the auxiliary circuit through the D/A output interface PA4 to amplify the signal.

As shown in Figure 4, the serial port communication module (4) of the present invention adopts the MAX232 serial port level conversion chip, which is used to convert the TTL level signal output by the main control module (1) into an RS232 level signal to realize the serialization of data. communication output.

Claims (4)

1. a humiture transducer, has main control module (1), it is characterized in that, also comprises the Temperature Humidity Sensor module (2) be connected with main control module (1); The D/A modular converter (3) be connected with main control module (1); The serial communication modular (4) be connected with main control module (1); The LCD MODULE (5) be connected with main control module (1); The power module (6) be connected with main control module (1).

2. a kind of humiture transducer according to claim 1, is characterized in that: described Temperature Humidity Sensor module (2) adopts digital temperature-humidity sensor DHT11, realizes the detection of humiture information in environment.

3. a kind of humiture transducer according to claim 1, it is characterized in that: the D/A converter that described D/A modular converter (3) is carried by main control module (1) inside and auxiliary circuit form, for converting digital quantity humiture information to analog voltage.

4. a kind of humiture transducer according to claim 1, it is characterized in that: described serial communication modular (4) adopts MAX232 serial port level conversion chip, for converting Transistor-Transistor Logic level signal to RS232 level signal, realize the serial communication of data.