CN207907961U - A kind of trunk runoff monitoring device based on wireless sensor network - Google Patents

Abstract

The utility model relates to a tree trunk runoff monitoring device based on a wireless sensor network, which includes an information processing and transmission system, an acquisition system, a mobile terminal and a power supply device. The acquisition system includes a thermal probe, an analog-to-digital converter, a sub-controller, and a sub-wireless module The information processing and transmission system includes a main wireless module, a main controller and a GSM network module, and is characterized in that: the tops of the two thermal probes are vertically inserted into the tree trunk, the ends of the two thermal probes are electrically connected with the analog-to-digital converter, and the analog-to-digital converter, The sub-controller, the sub-wireless module, the main wireless module, the main controller, and the GSM network module are electrically connected in sequence, and the GSM network module communicates with the mobile terminal through the mobile network. Platinum metal thermistor is used, which has high precision, low price and long service life; through the acquisition system, the data of multiple outlets can be collected at the same time and sent to the information processing and transmission system, and the information processing and transmission system will send the data to the mobile terminal, which is convenient for users at any time Check anywhere to see how your plants are growing.

Description

A tree trunk runoff monitoring device based on wireless sensor network

technical field

The utility model relates to the technical field of trunk runoff measurement, in particular to a trunk runoff monitoring device based on a wireless sensor network.

Background technique

Forest ecosystem is a natural complex in which forest community and its environment form a certain structure, function and self-regulation under the action of functional flow. It is the largest and most important natural ecosystem in terrestrial ecosystems. The rainfall statistics of the forest ecosystem is an important indicator to reflect the state of the entire forest. Only by mastering this indicator and paying attention to its changes in real time can we better understand the growth process of the entire forest and grasp its development law.

Today, it is increasingly common to measure runoff from plants using a runoff meter, an instrument that measures the rate of runoff by heating plant stems. However, the measurement accuracy of the existing runoff meter is not high, the measured data and the actual gap are large, and the reference value is not high; moreover, when the existing runoff meter measures the stem of the plant, it requires a lot of manpower, and the efficiency is low, and It is difficult to observe the trunk runoff data at any time.

Contents of the invention

The purpose of this utility model is to provide a trunk runoff monitoring device based on a wireless sensor network to solve the problems raised in the above-mentioned background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions: a trunk runoff monitoring device based on a wireless sensor network, including an information processing and transmission system, several collection systems electrically connected to the information processing and transmission system, a mobile terminal and Power supply device, the acquisition system includes a thermal probe, an analog-to-digital converter, a sub-controller, and a sub-wireless module; the information processing and transmission system includes a main wireless module, a main controller and a GSM network module, and its structural characteristics are: the The thermal probe is elongated and made of Pt100 thermistor. There are two thermal probes, namely the first thermal probe and the second thermal probe. The first thermal probe is wound with a heating wire, and the two thermal probes are The tops of the thermal probes are all vertically inserted into the tree trunk, and the first thermal probe is positioned above the second thermal probe, and the other ends of the two thermal probes are electrically connected to the analog-to-digital converter, and the analog-to-digital converter is connected to the The sub-controller is electrically connected, and the analog-to-digital converter is used to convert the temperature signal of the thermal probe into a voltage signal, and transmit the voltage signal to the sub-controller; the sub-controller is electrically connected to the sub-wireless module connection, the sub-wireless module is electrically connected to the main wireless module, the main wireless module is electrically connected to the main controller, the main controller is electrically connected to the GSM network module, and the GSM network module passes The mobile network communicates with the mobile terminal; the power supply device supplies power to the sub-controller and the heating wire, and the sub-controller is electrically connected to the heating wire and controls the heating of the heating wire.

Preferably, the end of the heat probe in contact with the tree trunk is sharp, and the side wall is provided with trapezoidal threads.

Preferably, the power supply device includes a storage battery and a solar panel that provides electric energy for the storage battery, and the storage battery supplies power for the heating wire and the sub-controller.

Preferably, the analog-to-digital converter, the sub-controller and the sub-wireless module are all arranged in a housing, the housing is sealed and insulated from the outside, the housing is in the shape of a cuboid, and an arc-shaped recess is provided on the side wall of the housing. A groove, straps are fixed on both sides of the groove; an inverted "V"-shaped guard plate is fixed on the upper surface of the housing, and a gap corresponding to the groove is opened on the guard plate.

Preferably, several vertical reinforcing ribs are fixed on the surface of the groove.

Preferably, the tail of the thermal probe is wrapped with a heat insulation layer.

Preferably, the mobile terminal includes a mobile phone and a computer.

The beneficial effects of the utility model are: by using the platinum metal thermistor, the precision is high, the price is low, and the service life is long; through the setting of the acquisition system, the data of multiple outlets can be collected at the same time and sent to the information processing and transmission system, and the information processing and transmission The system sends the data to the mobile terminal, which is convenient for users to view anytime and anywhere, so as to understand the growth status of the plants; the utility model has high automation, high monitoring efficiency, saves manpower, and is suitable for popularization and application.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Fig. 2 is a partial structural diagram of the utility model.

Among them: 1-First thermal probe, 2-Second thermal probe, 3-Analog to digital converter, 4-Sub-controller, 5-Sub wireless module, 6-Main wireless module, 7-Main controller, 8-GSM Network module, 9-mobile terminal, 11-heating wire, 101-battery, 102-solar panel, 103-housing, 104-shield, 105-groove, 106-reinforcing rib, 107-insulation layer, 108- trunk.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

A trunk runoff monitoring device based on a wireless sensor network, as shown in Figure 1 and Figure 2, includes an information processing and transmission system, several acquisition systems electrically connected to the information processing and transmission system, a mobile terminal 9 and a power supply device, The collection system includes thermal probes, analog-to-digital converters 3, sub-controllers 4, and sub-wireless modules 5; the information processing and transmission system includes main wireless modules 6, main controllers 7 and GSM network modules 8; the thermal probes It is elongated and made of Pt100 thermistor. There are two thermal probes, which are respectively the first thermal probe 1 and the second thermal probe 2. The first thermal probe 1 is wound with a heating wire 11, and the power supply The device supplies power to the sub-controller 4 and the heating wire 11, the sub-controller 4 is electrically connected to the heating wire 11, and controls the heating of the heating wire 11; the tops of the two thermal probes are vertically inserted into the trunk 108 , and the first thermal probe 1 is located above the second thermal probe 2, by heating the heating wire 11, a temperature difference is generated between the two thermal probes, and the other ends of the two thermal probes are electrically connected to the analog-to-digital converter 3 , the analog-to-digital converter 3 is electrically coupled with the sub-controller 4, the analog-to-digital converter 3 is used to convert the temperature signal of the thermal probe into a voltage signal, and transmit the voltage signal to the sub-controller device 4, through the calculation of the program in the sub-controller 4, thereby obtaining the tree runoff velocity; the sub-controller 4 is electrically connected with the sub-wireless module 5, and the sub-wireless module 5 is electrically connected with the main wireless module 6 , the main wireless module 6 is electrically connected with the main controller 7, the main controller 7 is electrically connected with the GSM network module, and the GSM network module communicates with the mobile terminal 9 through a mobile network; sub-control After the runoff velocity calculated by the device 4, the obtained data is sent to the main wireless module 6 in the information processing transmission system through the sub-wireless module 5, and then processed by the main controller 7 and transmitted by the GSM network module, and finally the data is uploaded to the Mobile terminal 9 for easy viewing.

In this embodiment, the end of the end of the thermal probe in contact with the trunk 108 is sharp, and its side wall is provided with a trapezoidal screw thread, so that the thermal probe can be inserted into the trunk 108 more easily. The setting of the thread can make the thermal probe fixed in the tree trunk 108 more firmly.

In this embodiment, the power supply device includes a battery 101 and a solar panel 102 that provides electric energy for the battery 101, the battery 101 supplies power to the heating wire 11 and the sub-controller 4, and controls the heating wire 11 through the sub-controller 4 heating. The solar panel 102 can store electricity for the storage battery 101 under the sunlight, thereby increasing the service life of the storage battery 101 and making full use of natural resources.

In this embodiment, the analog-to-digital converter 3, the sub-controller 4 and the sub-wireless module 5 are all arranged in a casing 103, the casing 103 is sealed and externally insulated, and the casing 103 is in the shape of a cuboid. An arc-shaped groove 105 is opened on the side wall of the body 103, and straps are fixed on both sides of the groove 105; an inverted "V"-shaped guard plate 104 is fixed on the upper surface of the housing 103, and the guard plate 104 Notches corresponding to the grooves 105 are defined on the board 104 . When in use, the housing 103 is fixed to the trunk 108 below the two thermal probes through the groove 105 and the strap, and the inverted "V"-shaped guard plate 104 is fixed on the housing 103, which can reduce rainwater on the housing 103 in rainy days. Staying and accumulating on the upper surface prevents leakage of electricity from the casing and increases the service life of the casing 103.

In this embodiment, several vertical reinforcing ribs 106 are fixed on the surface of the groove 105 . Arrange in this way, after casing 103 is tied on the trunk 108, reinforcing rib 106 exists between trunk 108 and the casing, can make there is gap between casing 103 and trunk 108, when rainwater flows down along trunk 108 like this , will not flow to the casing 103, thereby reducing the possibility of electric leakage in the casing 103 and increasing the service life of the casing 103.

In this embodiment, the tail of the thermal probe is wrapped with a thermal insulation layer 107 so as to isolate the influence of the external temperature environment.

In this embodiment, the mobile terminal 9 includes a mobile phone and a computer.

Working method and principle: First, insert two heat probes into the tree trunk. The heat probes contain sensitive thermistors, which can realize temperature-voltage conversion. The first thermal probe 1 is continuously heated by the electric heating wire, and the heating method adopts timing heating, the time is controlled by the sub-controller 4, and the second thermal probe 2 is used as the reference end; the heat generated by the first thermal probe 1 will be transferred to the bottom, different heat The thermistor resistance of the two thermal probes will be different, and the voltage difference between the two ends of the thermal probe will also be different, so as to meet the demand for analog-to-digital conversion; then, after the temperature-voltage conversion of the thermal probe, use the modulus The converter 3 collects the voltage difference, and transmits the collected data to the sub-controller 4, calculates the temperature difference between the two ends through the relationship formula between the temperature and voltage of the thermistor, and then calculates the temperature difference between the two ends by The standard equation can be used to obtain the instantaneous liquid flow density ( is the maximum temperature difference between day and night; is the instantaneous temperature difference, that is, the measured value; is the instantaneous liquid flow density); finally, the collected data is edited into a short message format in the sub-controller 4, and the edited short message is sent to the information processing and transmission system by the sub-wireless module 5. The sub-wireless module 5 and the main wireless module 6 play the role of wireless transmission data in the utility model, and are mainly used to collect the data collected, and the sub-wireless module 5 is set as a data transmission mode; the main wireless module 6 is set as a data receiving mode. mode, summarizing and receiving the data sent by each sub-wireless module, and after the received data information is analyzed and processed by the main controller 7, it is read from the serial port of the GSM network module 8 and sent to the corresponding mobile terminal 9 through the network, so that the user You can understand the growth of plants through smart mobile devices.

In this embodiment, the specific model of the analog-to-digital converter 3 is AD7725, the sub-controller 4 and the main controller 7 both use STM32 series control chips, and the sub-wireless module 5 and the main wireless module 6 use NRF24L01 wireless modules.

The above embodiments are only used to illustrate the utility model, but not to limit the utility model. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the utility model. , so all equivalent technical solutions also belong to the category of the utility model, and the patent protection scope of the utility model should be defined by the claims.

Claims (7)

1. A trunk runoff monitoring device based on a wireless sensor network, comprising an information processing transmission system, several collection systems electrically connected to the information processing transmission system, a mobile terminal (9) and a power supply device, the collection system comprising Thermal probe, analog-to-digital converter (3), sub-controller (4), sub-wireless module (5); the information processing and transmission system includes a main wireless module (6), a main controller (7) and a GSM network module ( 8), characterized in that: the thermal probe is slender and made of Pt100 thermistor, there are two thermal probes, namely the first thermal probe (1) and the second thermal probe (2), the A heating wire (11) is wound on the first thermal probe (1), the tops of the two thermal probes are vertically inserted into the tree trunk (108), and the first thermal probe (1) is located on the second thermal probe (2 ), the other ends of the two thermal probes are electrically connected to the analog-to-digital converter (3), the analog-to-digital converter (3) is electrically connected to the sub-controller (4), and the analog-to-digital converter The device (3) is used to convert the temperature signal of the thermal probe into a voltage signal, and transmit the voltage signal to the sub-controller (4); the sub-controller (4) and the sub-wireless module (5 ), the sub-wireless module (5) is electrically connected to the main wireless module (6), the main wireless module (6) is electrically connected to the main controller (7), and the main controller ( 7) electrically connected to the GSM network module, the GSM network module communicates with the mobile terminal (9) through a mobile network; the power supply device supplies power to the sub-controller (4) and the heating wire (11), The sub-controller (4) is electrically connected with the heating wire (11), and controls the heating of the heating wire (11). 2. A tree trunk runoff monitoring device based on a wireless sensor network according to claim 1, characterized in that: the end of the thermal probe in contact with the tree trunk (108) is sharp, and its side wall is provided with Acme thread. 3. The trunk runoff monitoring device based on wireless sensor network according to claim 1, characterized in that: the power supply device includes a storage battery (101) and a solar panel (102) that provides electric energy for the storage battery (101) ), the storage battery (101) supplies power to the heating wire (11) and the sub-controller (4). 4. The trunk runoff monitoring device based on wireless sensor network according to claim 1, characterized in that: the analog-to-digital converter (3), the sub-controller (4) and the sub-wireless module (5) are all set Inside the casing (103), the casing (103) is sealed and externally insulated, the casing (103) is in the shape of a cuboid, and an arc-shaped groove (105) is opened on the side wall of the casing (103), Both sides of the groove are fixed with straps; the upper surface of the housing (103) is fixed with an inverted "V"-shaped guard (104), and the guard (104) is provided with a Groove (105) corresponding breach. The trunk runoff monitoring device based on wireless sensor network according to claim 4, characterized in that: the surface of the groove (105) is fixed with several vertical reinforcing ribs (106). 6. The tree trunk runoff monitoring device based on wireless sensor network according to claim 1, characterized in that: the tail of the thermal probe is wrapped with a thermal insulation layer (107). 7. The trunk runoff monitoring device based on wireless sensor network according to claim 1, characterized in that: the mobile terminal (9) includes a mobile phone and a computer.