Wireless paddy field water level and soil temperature and humidity sensor

Abstract

The present invention belongs to the technical field of water level and temperature and humidity detection, and relates to a wireless paddy field water level and soil temperature and humidity sensor. It comprises: a cylinder cover, a control cylinder body and a core sensing module; the cylinder cover comprises an antenna and a switch; the core sensing module comprises a water level sensing probe, a humidity sensing probe and a temperature sensing probe; the control cylinder body comprises a circuit board and a battery, and a water level conduit channel is arranged in the center; the circuit board comprises a main control chip, a wireless communication module and a sensing circuit module. The main control chip adopts an ultra-low power consumption 8-bit single-chip microcomputer; the wireless communication module adopts Zigbee wireless network transmission; the sensor circuit module comprises a humidity acquisition part, a temperature acquisition part and a water level acquisition part. The present invention has the advantages of low cost, high precision and good reliability, etc., can realize long-term real-time online monitoring of temperature, humidity and water level, improves agricultural planting efficiency, and has good application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of water level and temperature and humidity detection, and relates to a wireless paddy field water level and soil temperature and humidity sensor. Background Art

[0002] Crop growth requires a suitable environment. Temperature, humidity and water level are the most important environmental factors for normal crop growth. Therefore, accurate and real-time knowledge of paddy field water level and soil temperature and humidity is of great significance to agricultural production practice. Online real-time monitoring of paddy field water level and soil temperature and humidity is conducive to saving agricultural inputs and maintaining appropriate soil moisture conditions; it is conducive to guiding farmers to irrigate rationally, making effective use of water resources and creating a good environment for crop growth.

[0003] At present, most of the temperature, humidity and water level sensors on the market generally have problems such as high power consumption, high cost and low automation, which are not suitable for long-term work in the field, and the actual application effect in the field of farmland monitoring needs to be improved. Based on this, the present invention designs a wireless paddy field water level and soil temperature and humidity sensor, which has the advantages of low power consumption, long service life, stable operation, real-time and accurate data transmission, etc., and can realize online monitoring of paddy field water level and soil temperature and humidity for a long time, meet actual production needs, and have good application prospects. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to provide a wireless paddy field water level and soil temperature and humidity sensor that can be used in agriculture with low cost, low power consumption, good timeliness, easy installation and long-distance multi-point wireless communication.

[0005] The technical solution of the present invention is:

[0006] A wireless paddy field water level and soil temperature and humidity sensor, which is used for wirelessly monitoring paddy field water level and soil temperature and humidity data, comprises: a cylinder cover, a control cylinder and a core sensor module; the cylinder cover is installed and connected to the upper end of the control cylinder; the core sensor module is connected to the bottom end of the control cylinder through a card plate; the cylinder cover comprises a switch and an antenna; the control cylinder comprises a circuit board and a battery, and a water level conduit channel is provided in the center; the core sensor module comprises a water level sensor probe, a humidity sensor probe and a temperature sensor probe; the water level sensor probe is placed in the water level conduit, and a water level probe is installed at the lower end; the humidity sensor probe and the temperature sensor probe are located on opposite sides of the lower section of the water level conduit; two resistance alloy probes at the bottom of the humidity sensor probe pass through the bottom of the core sensor module; a platinum probe at the bottom of the temperature sensor probe passes through the bottom of the core sensor module, and a metal protective shell is covered on the outside of the platinum probe, which is sealed and fixed with a waterproof nut; the circuit board comprises a main control chip, a sensor circuit module and a wireless communication module.

[0007] The upper part of the tube cover is provided with a recessed part, in which the switch and the antenna are embedded.

[0008] The control cylinder has a recessed portion for installing the battery, a pair of PCB positioning pieces are arranged on both sides of the cylinder wall, and a circuit board is installed on the rear side.

[0009] Air pressure balance pipes are provided on opposite sides of the water level conduit; an air pressure balance hole is opened on the top of the air pressure balance pipe, the upper section is communicated with the water level conduit, the middle section is fixed to the center of the control cylinder, and the lower section is fixed to the temperature sensor probe housing and the humidity sensor probe housing by bolts.

[0010] The water level sensing probe is equipped with water level probes of different lengths and a number greater than 1.

[0011] The core sensor module is provided with a reference identification circle on the outside to indicate the insertion depth of the sensor, and a water inlet hole is provided in the middle.

[0012] The antenna is electrically connected to the wireless communication module and uses the Zigbee network for wireless transmission; the humidity signal line and the temperature signal line are respectively passed through two threading holes at the bottom of the control cylinder and are electrically connected to the sensor circuit module.

[0013] Preferably, the main control chip adopts an STM8L051 series ultra-low power 8-bit single-chip microcomputer.

[0014] Preferably, the water level sensing probe is equipped with 6 water level probes, the lengths of which are evenly distributed between 10 and 250 mm.

[0015] Preferably, multi-point wireless communication can be performed through the antenna to finally upload the data to the target server for storage.

[0016] Preferably, the platinum probe adopts a Pt100 high-precision four-wire platinum thermal resistor.

[0017] In summary, the beneficial effects of the present invention are:

[0018] 1. The entire sensor structure is compact, not easy to damage, and has little disturbance to crops;

[0019] 2. The monitoring mode can be switched automatically. When there is no water, the humidity is measured. When there is water, the water level is automatically switched to measure.

[0020] 3. When multiple sensors work at the same time, they can automatically establish a wireless transmission network to increase the data transmission distance;

[0021] 4.Using ultra-low power microcontroller and peripheral devices, the fixed data acquisition cycle enables the sensor to work in a dormant low-power state most of the time, extending the battery life;

[0022] 5. This sensor can monitor water levels within a non-continuous height of 250mm, which can meet the use requirements in most agricultural water level fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram showing an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure of the control cylinder of the present invention.

[0025] Figure 3 It is an internal cross-sectional view of the core sensor module of the present invention.

[0026] In the figure: 1. Cylinder cover; 2. Control cylinder; 3. Core sensor module; 4. Platinum probe; 5. Alloy probe; 6. Reference identification circle; 7. Switch; 8. Antenna; 9. PCB positioning plate; 10. Circuit board; 11. Water level sensor probe; 12. Main control chip; 13. Air pressure balance tube; 14. Threading hole; 15. Air pressure balance hole; 16. Battery; 17. Water level probe; 18. Water level conduit; 19. Humidity signal line; 20. Humidity sensor probe; 21. Waterproof nut; 22. Temperature sensor probe; 23. Water inlet hole; 24. Card; 25. Temperature signal line. DETAILED DESCRIPTION

[0027] Now combined with the attached Figure 1 ——3 Describe the embodiments of the present invention in detail and further describe the present invention in detail.

[0028] A wireless paddy field water level and soil temperature and humidity sensor, which is used for wirelessly monitoring paddy field water level and soil temperature and humidity data, comprises: a cylinder cover 1, a control cylinder 2 and a core sensor module 3; the cylinder cover 1 is installed and connected to the upper end of the control cylinder 2; the core sensor module 3 is connected to the bottom end of the control cylinder 2 through a card plate 24; the cylinder cover 1 comprises a switch 7 and an antenna 8; the control cylinder 2 comprises a circuit board 10 and a battery 16, and a water level conduit 18 channel is provided in the center; the core sensor module 3 comprises a water level sensor probe 11, a humidity sensor probe 20 and a temperature sensor probe 22; the water The level sensing probe 11 is placed in the water level conduit 18, and a water level probe 17 is installed at the lower end; the humidity sensing probe 20 and the temperature sensing probe 22 are located on opposite sides of the lower section of the water level conduit 18; the two resistance alloy probes 5 at the bottom of the humidity sensing probe 20 pass through the bottom of the core sensing module 3; a platinum probe 4 at the bottom of the temperature sensing probe 22 passes through the bottom of the core sensing module 3, and the platinum probe 4 is covered with a metal protective shell and sealed and fixed with a waterproof nut 21; the circuit board 10 includes a main control chip 12, a sensor circuit module and a wireless communication module.

[0029] The upper part of the tube cover 1 is provided with a recessed portion, in which the switch 7 and the antenna 8 are embedded.

[0030] The control cylinder 2 has a recessed portion for mounting a battery 16 , a pair of PCB positioning pieces 9 are provided on both sides of the cylinder wall, and a circuit board 10 is installed on the rear side.

[0031] Air pressure balance pipes 13 are provided on opposite sides of the water level conduit 18; an air pressure balance hole 15 is opened at the top of the air pressure balance pipe 13, the upper section of which is connected to the water level conduit 18, the middle section is fixed to the center of the control cylinder 2, and the lower section is fixed to the outer casing of the temperature sensor probe 22 and the outer casing of the humidity sensor probe 20 by bolts.

[0032] The water level sensing probe 11 is equipped with water level probes 17 of different lengths and a number greater than 1.

[0033] The core sensor module 3 is provided with a reference identification circle 6 on the outside to indicate the insertion depth of the sensor, and a water inlet hole 23 is provided in the middle.

[0034] The antenna 8 is electrically connected to the wireless communication module and adopts the Zigbee network for wireless transmission; the humidity signal line 19 and the temperature signal line 25 are respectively passed through two threading holes 14 at the bottom of the control cylinder 2 and are electrically connected to the sensor circuit module.

[0035] The steps for using the wireless paddy field water level and soil temperature and humidity sensor are as follows:

[0036] a. Insert the platinum probe 4 and the alloy probe 5 vertically into the position to be tested;

[0037] b. Continue to adjust the sensor position so that the part below the reference mark circle 6 is completely buried in the soil, ensuring that the reference mark circle 6 and the surrounding land are at the same level. After confirmation, reinforce the sensor.

[0038] c. Turn on the top switch 7 and the sensor starts working;

[0039] d. Start measuring temperature, humidity or water level, and feed back the detected value to the main control chip 12;

[0040] e. Repeat step d to test the environment multiple times to ensure the reliability of the data;

[0041] f. The main control chip 12 performs algorithms such as verification and validity judgment on the data and takes the average value, and sends the water level and temperature and humidity data to the remote service base station via the wireless communication module;

[0042] g, the sensor enters sleep state;

[0043] h. Set the sampling interval as needed and repeat steps d to g to achieve real-time monitoring of data.

[0044] In the present invention, the principle of the sensor is: the sensing circuit module is divided into a humidity acquisition part, a temperature acquisition part and a water level acquisition part. The humidity acquisition part is formed by connecting a humidity probe, a voltage divider bias circuit and an operational amplifier in sequence. A pair of humidity probes are made of a special metal alloy, which is acid and alkali resistant, and the resistivity under different humidity is obtained in the form of simulated resistance. The temperature acquisition part circuit adopts a three-wire connection method of a constant current source; the output lead of the platinum resistor is connected to the IN- of the instrument amplifier AD620, supporting the measurement temperature range of -20°C to +70°C, which meets most usage scenarios. The water level acquisition part uses multiple 304 stainless steel electrodes, and uses the conductivity of the liquid to detect the water level height. When the water level rises to touch the bottom of the electrode, a potential signal is generated. After the water level signal is input into the main control chip for processing through the Schmitt trigger, the corresponding water level relationship is obtained. Finally, all data is sent to the remote service base station for processing and display through the wireless communication transmission module.

[0045] The embodiments described above through the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention. For those skilled in the art, modifications and parameter substitutions can be made to the present embodiment without departing from the principle and spirit of the present invention. The scope of the present invention is determined by the attached claims and their equivalents.

Claims

1. A wireless paddy field water level and soil temperature and humidity sensor, which is used to wirelessly monitor paddy field water level and soil temperature and humidity data, comprising: A cylinder cover (1), a control cylinder (2) and a core sensor module (3); the cylinder cover (1) is installed and connected to the upper end of the control cylinder (2); the core sensor module (3) is connected to the lower end of the control cylinder (2) through a clamping plate (24); the cylinder cover (1) comprises a switch (7) and an antenna (8); the control cylinder (2) comprises a circuit board (10) and a battery (16), and a water level conduit (18) channel is provided at the center; the core sensor module (3) comprises a water level sensor probe (11), a humidity sensor probe (20) and a temperature sensor probe (22); the water level sensor probe (11) is placed in the water level conduit (18), and a water level probe (17) is installed at the lower end; the humidity sensor probe (20) and the temperature sensor probe (22) are located on opposite sides of the lower section of the water level conduit (18); two resistance alloy probes (5) at the bottom of the humidity sensor probe (20) The temperature sensor probe (22) is provided with a platinum probe (4) at the bottom thereof and passes through the bottom of the core sensor module (3); the platinum probe (4) is covered with a metal protective shell and sealed and fixed by a waterproof nut (21); the circuit board (10) comprises a main control chip (12), a sensor circuit module and a wireless communication module; the control cylinder (2) has a recessed portion for installing a battery (16), a pair of PCB positioning pieces (9) are provided on both sides of the cylinder wall, and a circuit board (10) is installed on the rear side; air pressure balance pipes (13) are provided on opposite sides of the water level conduit (18); an air pressure balance hole (15) is provided at the top of the air pressure balance pipe (13), the upper section of which is communicated with the water level conduit (18), the middle section is fixed to the center of the control cylinder (2), and the lower section is fixed to the outer shell of the temperature sensor probe (22) and the outer shell of the humidity sensor probe (20) by bolts.

2. The wireless paddy field water level and soil temperature and humidity sensor according to claim 1 is characterized in that: The upper part of the tube cover (1) is provided with a recessed portion, in which the switch (7) and the antenna (8) are embedded.

3. The wireless paddy field water level and soil temperature and humidity sensor according to claim 1 is characterized in that: The water level sensing probe (11) is equipped with water level probes (17) of different lengths and a number greater than 1.

4. The wireless paddy field water level and soil temperature and humidity sensor according to claim 1, characterized in that: The core sensor module (3) is provided with a reference identification circle (6) on the outside for indicating the insertion depth of the sensor, and a water inlet hole (23) in the middle.

5. The wireless paddy field water level and soil temperature and humidity sensor according to claim 1, characterized in that: The antenna (8) is electrically connected to the wireless communication module and uses a Zigbee network for wireless transmission; the humidity signal line (19) and the temperature signal line (25) respectively pass through two threading holes (14) located at the bottom of the control cylinder (2) and are electrically connected to the sensor circuit module.

Images