Rice field water layer condition monitoring device combined with unmanned aerial vehicle

Abstract

The invention provides a rice field water layer condition monitoring device combined with an unmanned aerial vehicle, and relates to the technical field of water layer condition monitoring. The rice field water layer condition monitoring device combined with the unmanned aerial vehicle comprises the unmanned aerial vehicle, a hollow pipe body, a slidable sleeve, a field surface platform, a hollow platform, a water level stabilizing cylinder, a first metal detection piece, a second metal detection piece, an LED indicator lamp and a circuit element module. According to the invention, the field surface platform is arranged, so that the metal detection sheet can automatically descend along with the field surface when the rice field is dry and settled; when the water layer of the rice field is in different conditions, the LED indicator lamp at the top of the device can display different colors; the device is installed in different fields in a rice irrigation area, the water layer conditions of the multiple fields can be quickly known by uploading the colors of the LED indicator lamps through the consumer-level unmanned aerial vehicle, and real-time monitoring of the water layer conditions of the large-area rice field is efficiently achieved.

Description

Technical Field

[0001] This invention relates to the field of water layer condition monitoring technology, and specifically to a paddy field water layer condition monitoring device that combines a drone with a water layer condition monitoring device. Background Technology

[0002] Rice is one of the major food crops, requiring a large amount of water during its growth. Maintaining suitable water levels in paddy fields is crucial for ensuring stable and high grain yields. Currently, with the vigorous advancement of irrigation modernization, higher demands are being placed on water conservation and efficiency in agricultural production. For rice irrigation areas, the ability to quickly and extensively monitor paddy field water levels in real time has become fundamental for scientifically formulating irrigation and drainage plans and rationally allocating water resources, and is a key aspect of promoting the modernization of rice irrigation areas.

[0003] Existing methods for monitoring paddy field water levels include installing water level sensors and remote sensing inversion. However, existing water level sensors suffer from high costs, complex installation, difficult maintenance, and a tendency to detach from the paddy field surface during alternating wet and dry periods, making large-scale installation in irrigated areas difficult. Remote sensing inversion, on the other hand, is susceptible to weather conditions, has low processing efficiency, and poor generalization ability of the inversion model, thus limiting its widespread application in irrigated areas. Summary of the Invention

[0004] The purpose of this invention is to provide a paddy field water layer condition monitoring device that combines drones, which can quickly obtain the water layer condition of paddy fields and efficiently realize real-time monitoring of water layer conditions in large-area paddy fields.

[0005] To achieve the above objectives, the present invention provides a paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV), comprising a UAV, a hollow tube body, a sliding sleeve, a platform at the field surface, a hollow platform, a water level stabilizing cylinder, a first metal detector, a second metal detector, an LED indicator, and a circuit component module. The bottom end of the hollow tube body is inserted into the plow pan of the paddy field to be monitored; a sliding sleeve is fitted onto the hollow tube body and can slide freely along the hollow tube body; the field surface platform and the hollow platform are fixed to the lower and upper ends of the sliding sleeve, respectively, and can slide together with the sliding sleeve; the two ends of the water level stabilizing cylinder are fixedly connected to the field surface platform and the hollow platform, respectively; the first metal detector and the second metal detector are both fixed inside the hollow platform; LED indicator lights are set at the top of the hollow tube body; The first metal detector, the second metal detector, and the LED indicator are all electrically connected to the circuit element module. The circuit element module is used to control the LED indicator to emit different colors of light according to the equivalent capacitance of the first metal detector, the second metal detector, and the water in the paddy field to be monitored. The drone is used to identify the color of the light emitted by the LED indicator and upload it to the user terminal so that the user can know the water level of the rice field to be monitored based on the color of the light emitted by the LED indicator.

[0006] According to the present invention, a paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) is provided, wherein the upper end of a first metal detector is fixed inside a hollow platform and the lower end is in contact with the platform on the field surface; the upper end of a second metal detector is fixed inside a hollow platform and the lower end is at a predetermined distance from the platform on the field surface.

[0007] According to the present invention, a combined UAV-based paddy field water level monitoring device includes a circuit component module comprising two capacitor three-point oscillation circuits, two amplification and comparison circuits, and a single-chip main control circuit; each metal detector is equipped with a capacitor three-point oscillation circuit and an amplification and comparison circuit. The three-point capacitor oscillator circuit is used to provide a stable high-frequency excitation signal for the corresponding metal detector and obtain the output value; the amplifier and comparator circuit is used to amplify the output value of the three-point capacitor oscillator circuit and convert the analog signal into a digital signal; the single-chip main control circuit is used to receive and parse the digital signal, and generate control commands according to the preset logic to drive the LED indicator to act, so that the LED indicator emits different colors of light under different paddy field water layer conditions. According to the present invention, a paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) includes LED indicator lights: a blue LED, a green LED, and a red LED. The LED indicator lights emit different colors of light under different paddy field water level conditions, including: When the water depth on the field surface is higher than the preset distance, the LED blue light illuminates; when there is a water layer on the field surface but the water depth is lower than the preset distance, the LED green light illuminates; when there is no water layer on the field surface, the LED red light illuminates. According to the present invention, a paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) further includes a battery and a fixed bracket; the fixed bracket is fixed to the top of the hollow tube body, and the battery and circuit element module are mounted on the fixed bracket; the battery is used to power the circuit element module, and the circuit element module is electrically connected to the first metal detection plate and the second metal detection plate through wires. According to the present invention, a paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) further includes a first wire protection sleeve and a second wire protection sleeve; the first wire protection sleeve is fixed on a hollow platform and can slide together with a sliding sleeve; the second wire protection sleeve is fixed on a hollow tube body, is L-shaped, and includes a horizontal hollow tube and a vertical hollow tube connected vertically, and the first wire protection sleeve can slide on the vertical hollow tube; the wire passes through the first wire protection sleeve and the second wire protection sleeve. According to the present invention, a paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) further includes a solar panel and a connecting pipe; one end of the connecting pipe is fixedly connected to the top of the hollow tube body, and the other end of the connecting pipe is fixed to the solar panel; the solar panel is electrically connected to a storage battery.

[0008] The paddy field water level monitoring device provided by the present invention also includes a limiting plate; the limiting plate is fixedly installed at the lower end of the hollow tube body, and the platform at the field surface is located above the limiting plate. According to the present invention, a paddy field water level monitoring device for a combined unmanned aerial vehicle (UAV) is provided, wherein small holes are provided on both sides of the water level stabilizing cylinder, and gauze is covered on the small holes. The paddy field water level monitoring device provided by the present invention also includes an LED indicator bracket; the LED indicator bracket is fixed to the top of the hollow tube body, and the LED indicator is fixed on the LED indicator bracket. This invention has at least the following technical effects: This invention provides a combined UAV-based paddy field water level monitoring device, comprising a UAV, a hollow tube body, a sliding sleeve, a field surface platform, a hollow platform, a water level stabilizing cylinder, a first metal detector, a second metal detector, LED indicator lights, and circuit component modules. By setting up a field surface platform, the metal detector automatically descends with the paddy field as it dries and settles. The LED indicator lights on the top of the device display different colors depending on the paddy field water level. By installing this device in different paddy fields within a paddy irrigation area and transmitting the LED indicator light colors using a consumer-grade UAV, the water level conditions of multiple fields can be quickly determined, efficiently achieving real-time monitoring of water levels in large-area paddy fields. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] In the attached diagram: Figure 1 This is a front view of the paddy field water level monitoring device combined with an unmanned aerial vehicle (UAV) according to the present invention; Figure 2 This is a side view of the paddy field water level monitoring device of the present invention (solar panel omitted). Figure 3 This is a side view of the sliding sleeve of the paddy field water level monitoring device of the present invention after it has slid (solar panel omitted). Figure 4 for Figure 1 Sectional view 1-1; Figure 5 for Figure 1 Sectional view 2-2; Figure 6 This is a schematic diagram of the circuit principle of the circuit element module of the present invention. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0012] The following detailed description of some embodiments of the present invention will be provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0013] Please see Figure 1 , Figure 2 and Figure 3 This invention proposes an automatic monitoring device for paddy field water level conditions using a combined UAV suitable for large-area rice irrigation areas. The device includes a UAV (not shown), a hollow tube body 1, a limiting plate 2, a sliding sleeve 3, a field surface platform at the lower part of the sleeve (hereinafter referred to as the field surface platform) 4, a hollow platform at the upper part of the sleeve (hereinafter referred to as the hollow platform) 5, a water level stabilizing cylinder 6, a first metal detector 7, a second metal detector 8, a first wire protection sleeve 10, a second wire protection sleeve 11, an LED indicator bracket 12, an LED indicator 13, a solar panel 14, a connecting pipe 15, a storage battery 16, a fixing bracket 17, and a circuit element module 18.

[0014] Specifically, this drone is a consumer-grade drone. Consumer-grade drones refer to micro-drones primarily used for personal and household consumption. Compared to industrial-grade drones, they are inexpensive, easy to deploy, and can perform flight missions without a professional license. Since this invention only requires the drone to identify the color of the LED indicator 13, a consumer-grade drone can acquire the color of the LED indicator 13 and upload it to the user terminal, allowing the user to determine the water level of the paddy field to be monitored based on the color of the light emitted by the LED indicator 13. Furthermore, modern consumer-grade drones can also perform constant-speed cruise and time-lapse photography of designated areas to acquire the color of the light emitted by the LED indicator 13. When this automatic water level monitoring device is widely installed in the paddy irrigation area, the user can quickly determine the water level of the corresponding field by using the user terminal to determine the color of the light emitted by the LED indicator 13 of the automatic water level monitoring device in different fields, as transmitted back by the drone.

[0015] It should be noted that for some smaller rice irrigation areas, the user terminal can be a remote control or a mobile phone. Users can directly view the real-time color images transmitted by the drone on the remote control or mobile phone. Based on the color images, they can know the color of the light emitted by the LED indicator 13, and thus directly determine the water level of the rice field to be monitored.

[0016] The hollow tube body 1 is a PVC pipe with an outer diameter of 8 cm and a wall thickness of 2 mm. Its total length is 175 cm, and the bottom end is a cone with a height of 5 cm, which makes it easy to insert into the plow pan of the paddy field to be monitored.

[0017] like Figure 4 and Figure 5 As shown, the limiting plate 2 is fixedly installed at the lower end of the hollow tube body 1, 30 cm away from the cone at the lower end of the hollow tube body 1. Its dimensions are 30 cm × 8.4 cm × 0.5 cm. It is used to prevent the sliding sleeve 3 from slipping off the hollow tube body 1 when storing and transporting the device, and can also be used to assist in judging whether the burial depth of the hollow tube body 1 meets the predetermined requirements.

[0018] A sliding sleeve 3, made of PVC, is fitted onto the hollow tube body 1 and can slide freely along the hollow tube body 1 (down to the limiting plate 2). Its outer diameter is 8.4 cm, the wall thickness is 2 mm, and the height is 10 cm. Because the paddy field is in a state of alternating wet and dry conditions, the surface will sink after the paddy field dries out and is exposed to sunlight. This sliding sleeve 3 is used to ensure that the metal detector plate descends synchronously with the surface of the paddy field.

[0019] The lower platform 4 of the sleeve is fixed to the bottom of the sliding sleeve 3 and can slide together with the sliding sleeve 3. Its dimensions are 30 cm × 30 cm × 0.2 cm. When the field surface settles, the lower platform 4 of the sleeve can always remain on the field surface, thus ensuring that the sliding sleeve 3 descends synchronously with the field surface and that the two metal detection plates 7 and 8 do not detach from the field surface.

[0020] The upper hollow platform 5 of the sleeve, made of PVC, is fixed to the top of the sliding sleeve 3 and can slide together with the sliding sleeve 3. Two metal detection plates are inserted into the upper hollow platform 5 from below. The connection between the metal detection plates and the upper hollow platform 5 should be tightly sealed to ensure no water leakage, and the two metal detection plates should be fixed in place. The dimensions of the upper hollow platform 5 are 8 cm × 6 cm × 1 cm, and the wall thickness is 2 mm.

[0021] The water level stabilizing cylinder 6 is fixedly connected at both ends to the field surface platform 4 and the hollow platform 5, respectively. Made of PVC, it is fixed between the lower part of the sleeve (field surface platform 4) and the upper part (hollow platform 5). Small holes 9 with a diameter of 1 cm are opened on both sides to ensure that water from the field surface can flow smoothly into the water level stabilizing cylinder 6. To prevent siltation, gauze should be covered over the small holes 9. The water level stabilizing cylinder 6 is 9 cm high, has an outer diameter of 4 cm, and a wall thickness of 2 mm.

[0022] The upper end of the first metal detector 7 is fixed inside the hollow platform 5, and the lower end is close to the platform 4 on the field surface. It is connected to a capacitor three-point oscillating circuit in the circuit element module 18 to detect whether there is a water layer on the field surface. The upper end of the second metal detector 8 is fixed inside the hollow platform 5, and the lower end is spaced at a preset distance from the platform 4 on the field surface, such as 6 cm. It is connected to another capacitor three-point oscillating circuit in the circuit element module 18 to detect whether the water depth on the field surface exceeds the preset distance (such as 6 cm).

[0023] Both the first wire protection sleeve 10 and the second wire protection sleeve 11 are made of PVC. One of them (the first wire protection sleeve 10) is fixed to the hollow platform 5 at the top of the sleeve and can slide together with the sliding sleeve 3. Its height is 15.5 cm, its outer diameter is 2 cm, and its wall thickness is 2 mm. The other (the second wire protection sleeve 11) is fixed to the hollow tube body 1 and cannot slide. It is L-shaped and consists of a horizontally placed horizontal hollow tube and a vertically placed vertical hollow tube connected together. Its outer diameter is 1.6 cm, its wall thickness is 2 mm, its horizontal section length is 6 cm, and its vertical section height is 17 cm. A small hole is provided at the connection between the second wire protection sleeve 11 and the hollow tube body 1 for holding the wire (… Figure 1 , Figure 2 , Figure 3 (The blue dashed line in the middle) connects to the hollow tube body 1. The first wire protection sleeve 10 can slide on the vertical hollow tube.

[0024] The circuit component module 18 is fixedly mounted on the mounting bracket 17. The mounting bracket 17 is fixed to the top of the hollow tube body 1. The circuit component module 18 connects to two metal detector plates 7 and 8, the LED indicator 13, and the battery 16. Four LED indicator brackets 12, each 5 cm long and spaced 5.8 cm apart, are fixed to the top of the hollow tube body 1. The LED indicator 13 is fixed to the LED indicator brackets 12, with a radius of 8 cm to ensure the drone can observe the color of the light.

[0025] The battery 16 is fixedly mounted on the mounting bracket 17. One end of the battery 16 is connected to the solar panel 14, and the other end is connected to the microcontroller in the circuit element module 18. The battery 16 and the mounting bracket 17 are located inside the hollow tube body 1. The bottom of the mounting bracket 17 is 5 cm away from the top of the hollow tube body 1, and the mounting bracket 17 is 0.5 cm thick.

[0026] The solar panel 14 is fixed to the connecting pipe 15. The solar panel 14 provides clean energy to the entire circuit, suitable for outdoor scenarios without power supply, and charges the battery 16. The connecting pipe 15 is made of PVC, with one end fixed to the hollow tube body 1 and the other end fixed to the solar panel 14. The connecting pipe 15 is 20 cm long, 1 cm in outer diameter, and 2 mm thick. A small hole is made at the connection point between the hollow tube body 1 and the connecting pipe 15 to facilitate the connection of wires from the solar panel 14 through the connecting pipe 15 to the battery 16.

[0027] The circuit element module 18 is used to control the LED indicator 13 to emit different colors of light based on the equivalent capacitance of the first metal detector 7, the second metal detector 8, and the water in the paddy field to be monitored. In other words, it controls the LED indicator 13 to emit different colors of light according to different water levels in the paddy field. The circuit element module 18 connects the first metal detector 7, the second metal detector 8, the battery 16, and the LED indicator 13, and includes two capacitor three-point oscillation circuits, two amplification and comparison circuits, and a single-chip main control circuit.

[0028] like Figure 6 As shown, each metal detector is equipped with a capacitor three-point oscillator circuit and an amplification and comparison circuit. The electrical signal is input to the main control circuit, such as a microcontroller, through the amplification and comparison circuit. The microcontroller then performs logical judgments to determine the different water levels in the paddy field. The three-point capacitive oscillator circuit (hereinafter referred to as the oscillator circuit) is used to provide a stable high-frequency excitation signal for the corresponding metal detector and obtain an output value. When the water level in the paddy field changes, the equivalent capacitance formed by the metal detector and the water will change, which will cause the output value of the oscillator circuit to change.

[0029] The amplification and comparison circuit is used to amplify the output value of the oscillation circuit, improve the anti-interference capability, and convert the analog signal into a digital signal, providing a basis for the subsequent single-chip main control circuit to identify the water layer condition.

[0030] The single-chip main control circuit is used to receive and parse digital signals, realize the judgment of the water level in the paddy field, and generate control commands according to preset logic to drive the LED indicator 13 to act, so as to complete the function of the LED indicator 13 emitting different colors of light under different water level conditions.

[0031] In one specific embodiment, the first metal detector 7 is used to detect the presence or absence of a water layer on the field surface, and the second metal detector 8 is used to detect whether the water depth on the field surface exceeds 6 cm. Each metal detector is connected to an oscillation circuit. The three-point capacitive oscillation circuit (such circuits are already available on the market and will not be described in detail here) is an LC sinusoidal oscillation circuit. Its core structure is a frequency selection network formed by an inductor (L) and two series capacitors (C), combined with the voltage divider feedback of the capacitors to achieve "positive feedback," that is, the phase of the feedback signal is consistent with the phase of the input signal, satisfying the phase balance condition of oscillation. When the capacitance changes, it will cause the frequency (f) and amplitude (Q) of the oscillation circuit output to change.

[0032] Connecting the metal detector to the oscillating circuit creates an equivalent capacitance between the metal detector and the water, affecting the total capacitance of the oscillating circuit. The metal detector can be considered a "sensitive probe" of the oscillating circuit; when the water level changes, this equivalent capacitance changes, consequently altering the frequency (f) and amplitude (Q) output by the oscillating circuit. In this invention, taking the second metal detector 8 as an example, the equivalent capacitance formed by the second metal detector 8 and the water is higher when the water depth exceeds 6 cm than when the water depth is below 6 cm. Therefore, when the water level drops from above 6 cm to below 6 cm, this equivalent capacitance decreases, leading to an increase in the frequency (f) and amplitude (Q) output by the oscillating circuit. This change in frequency (f) and amplitude (Q) can be considered a "water level sensitive signal" and is output to subsequent circuits.

[0033] The "water level sensitive signal" output by the three-point capacitive oscillator circuit is amplified by the transistor (such as 8050) in the "amplifier circuit" to prevent the weak signal from being interfered with or attenuated during transmission, and to ensure that the subsequent circuit can identify it stably.

[0034] Because water level changes continuously, the equivalent capacitance also changes continuously, resulting in continuous changes in both the "water level sensitive signal" and the "amplified water level signal." To achieve the function of "identifying whether the water level has reached the bottom of the metal detector," this invention also includes a "comparison circuit" to process the continuously changing water level signal. Therefore, the "amplified water level signal" is input to the "comparison circuit," which uses an LM393 dual-voltage comparator as its core. First, a reference voltage is preset. For the first metal detector 7, the reference voltage is the voltage when there is just no water layer on the field surface; for the second metal detector 8, the reference voltage is the voltage when the water layer depth on the field surface is exactly 6 cm. The water level signal is compared with the preset reference voltage. When the input water level signal voltage is higher than the reference voltage, the comparator outputs a high level; when it is lower, it outputs a low level. After this processing, the continuously changing water level signal is converted into high and low level digital signals, adapting to the subsequent digital signal processing requirements of the microcontroller.

[0035] The digital signal output from the amplification and comparison circuit is received by the single-chip microcontroller. This digital signal is processed in the STC89C51 microcontroller according to the pre-programmed water level judgment logic. The processing result is sent as a control command to the subsequent LED indicator 13 via the microcontroller's I / O port. The LED indicator 13 includes a blue LED, a green LED, and a red LED. When the water level on the paddy field is higher than 6cm, the blue LED receives a low level and illuminates. When there is water on the surface but the water depth is less than 6cm, the green LED receives a low level and illuminates. When there is no water on the surface, the red LED receives a low level and illuminates.

[0036] The method of using this invention is as follows: 1. The present invention provides a paddy field water layer condition monitoring device.

[0037] 2. Insert the bottom end of the hollow tube into the plow pan of the paddy field to be monitored. It should be noted that the bottom end of the hollow tube should be inserted at least 40 cm below the field surface to ensure that the entire device is firmly inserted into the plow pan; the solar panel should be placed in a north-south orientation.

[0038] 3. Slide the sliding sleeve so that the platform at the bottom of the sleeve is just above the field surface.

[0039] 4. Connect the circuit. Depending on the water level in the field, the LED indicator light on the device will display different colors.

[0040] 5. Install this device in several representative fields within the irrigation area.

[0041] 6. Launch the drone at the appropriate time. Based on the color displayed by the LED indicator light uploaded by the drone, the user can learn about the water level of the paddy field to be monitored through the user terminal.

[0042] The working principle of this invention is as follows: An automatic water level monitoring device is installed in paddy fields. The platform of the device is level with the field surface and automatically descends with the field as the paddy dries up and settles. When there is no water layer on the field surface, neither of the two metal detectors detects water, and the LED indicator on the top of the device lights up red, indicating that the paddy field is short of water and irrigation should be carried out in time. When there is a water layer on the field surface, but the water depth is less than 6 cm, only the first metal detector detects water, and the LED indicator on the top of the device lights up green, indicating that the water layer in the paddy field is at a suitable depth. When there is a water layer on the field surface, and the water depth is greater than 6 cm, both metal detectors detect water, and the LED indicator on the top of the device lights up blue, indicating that the rice is waterlogged and drainage is needed in time. When this device is installed over a large area in the rice irrigation area, drones can be launched at appropriate times, and the water level of the corresponding rice irrigation area can be determined based on the color of the LED indicator displayed by the drone.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Traditional water level monitoring sensors are expensive, and their readings are unstable and prone to large errors when applied to paddy field water level monitoring, making subsequent maintenance difficult. This invention does not aim for precise monitoring of paddy field water levels, but rather displays the water layer status in a low-cost manner, possessing the potential for large-scale installation in paddy irrigation areas. When the LED indicator is red, it indicates that the paddy field has no water layer and should be irrigated promptly; when the LED indicator is green, it indicates that the paddy field is at a suitable water depth; when the LED indicator is blue, it indicates that the paddy field is waterlogged and should be drained promptly. This device can provide a reliable basis for formulating irrigation and drainage plans. 2. Under alternating wet and dry conditions, the surface of paddy fields will sink, causing traditional water level monitoring sensors to easily detach from the field surface, resulting in inaccurate readings. To solve this problem, this invention designs a platform on the device that can sink synchronously with the field surface, ensuring that the metal detection plate does not detach from the field surface; 3. Existing remote sensing methods for monitoring paddy field moisture rely on interpreting spectral or thermal infrared images from drones to retrieve field moisture levels. This process is complex, inefficient, and lacks accuracy. Furthermore, the drones and cameras used are industry-grade, resulting in high costs. This invention, based on the color of LED indicator lights in the aforementioned device, combined with a consumer-grade drone, can quickly and accurately determine the paddy field water level. Moreover, this consumer-grade drone is less expensive and can be easily deployed in multiple locations within the irrigation area for large-scale monitoring.

[0044] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. It should be understood that the invention is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A combined UAV-based paddy field water level monitoring device, characterized in that, Includes a drone, a hollow tube body, a sliding sleeve, a field platform, a hollow platform, a water level stabilizing cylinder, a first metal detector, a second metal detector, LED indicator lights, and circuit component modules; The bottom end of the hollow tube body is inserted into the plow pan of the paddy field to be monitored; a sliding sleeve is fitted onto the hollow tube body and can slide freely along the hollow tube body; the field surface platform and the hollow platform are fixed to the lower and upper ends of the sliding sleeve, respectively, and can slide together with the sliding sleeve; the two ends of the water level stabilizing cylinder are fixedly connected to the field surface platform and the hollow platform, respectively; the first metal detector and the second metal detector are both fixed inside the hollow platform; LED indicator lights are set at the top of the hollow tube body; The first metal detector, the second metal detector, and the LED indicator are all electrically connected to the circuit element module. The circuit element module is used to control the LED indicator to emit different colors of light according to the equivalent capacitance of the first metal detector, the second metal detector, and the water in the paddy field to be monitored. The drone is used to identify the color of the light emitted by the LED indicator and upload it to the user terminal so that the user can know the water level of the rice field to be monitored based on the color of the light emitted by the LED indicator.

2. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 1, characterized in that, The upper end of the first metal detector is fixed inside the hollow platform, and the lower end is in contact with the platform on the field surface; the upper end of the second metal detector is fixed inside the hollow platform, and the lower end is at a predetermined distance from the platform on the field surface.

3. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 2, characterized in that, The circuit element module includes two capacitor three-point oscillator circuits, two amplification and comparison circuits, and a single-chip main control circuit; each metal detector is equipped with a capacitor three-point oscillator circuit and an amplification and comparison circuit. The capacitor three-point oscillation circuit is used to provide a stable high-frequency excitation signal for the corresponding metal detector and obtain an output value; the amplification and comparison circuit is used to amplify the output value of the capacitor three-point oscillation circuit and convert the analog signal into a digital signal; the single-chip main control circuit is used to receive and parse the digital signal, and generate control commands according to preset logic to drive the LED indicator to act, so that the LED indicator emits different colors of light under different paddy field water layer conditions.

4. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 3, characterized in that, The LED indicator light includes blue, green, and red LEDs; the LED indicator light emits different colors of light under different paddy field water levels, including: When the water depth on the field surface is higher than the preset distance, the LED blue light illuminates; when there is a water layer on the field surface but the water depth is lower than the preset distance, the LED green light illuminates; when there is no water layer on the field surface, the LED red light illuminates.

5. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 3, characterized in that, It also includes a storage battery and a mounting bracket; the mounting bracket is fixed to the top of the hollow tube body, and the storage battery and circuit element module are mounted on the mounting bracket; the storage battery is used to power the circuit element module, and the circuit element module is electrically connected to the first metal detection plate and the second metal detection plate through wires.

6. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 5, characterized in that, It also includes a first wire protection sleeve and a second wire protection sleeve; the first wire protection sleeve is fixed to the hollow platform and can slide together with the sliding sleeve; the second wire protection sleeve is fixed to the hollow tube body, and is L-shaped, including a horizontal hollow tube and a vertical hollow tube connected vertically, and the first wire protection sleeve can slide on the vertical hollow tube; the wire passes through the first wire protection sleeve and the second wire protection sleeve.

7. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 5, characterized in that, It also includes a solar panel and a connecting pipe; one end of the connecting pipe is fixedly connected to the top of the hollow tube body, and the other end of the connecting pipe is fixed to the solar panel; the solar panel is electrically connected to the battery.

8. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 1, characterized in that, It also includes a limiting plate; the limiting plate is fixedly installed at the lower end of the hollow tube body, and the platform at the field surface is located above the limiting plate.

9. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 1, characterized in that, The water level stabilizing cylinder has small holes on both sides, and the small holes are covered with gauze.

10. The paddy field water level monitoring device using a combined unmanned aerial vehicle (UAV) according to claim 1, characterized in that, It also includes an LED indicator bracket; the LED indicator bracket is fixed to the top of the hollow tube body, and the LED indicator is fixed on the LED indicator bracket.

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