US-12618791-B2 - Soil moisture detection device and system

Abstract

The present disclosure discloses a soil moisture detection device, a first pole and a second pole are set in soil, a power supply switch circuit is controlled through a main control chip, an external voltage is added to a signal oscillation source, voltage is converted into an oscillation signal by the signal oscillation source, oscillation signal reaches a first pole through a first capacitor and a first inductor. When the soil between the first pole and second pole is completely dry, the two are equivalent to an open circuit, and a waveform detection unit can collect strong oscillation signal corresponding to frequency. When the soil between the first pole and second pole is moist, the oscillation signal is transmitted from the first pole to the second pole through the moist soil, an intensity of the oscillation signal corresponding to the frequency collected by the waveform detection unit changes.

Inventors

• Zhongdong HUANG
• Jie Yang

Assignees

• Fujian Tiancheng Baode Intelligent Technology Co., Ltd.

Dates

Publication Date

20260505

Application Date

20231207

Priority Date

20231024

Claims (19)

1. 1 . A soil moisture detection device, comprising: a probe providing with an electrode and contacting soil, a first capacitor, a first inductor, a first resistor, a waveform detection unit, a main control chip, and an oscillation signal source; wherein the electrode comprises a first pole and a second pole; an output end of the oscillation signal source is electrically connected to an end of the first resistor, an input end of the waveform detection unit, and the first pole through the first capacitor, the first inductor; the second pole is grounded; and an output end of the waveform detection unit is connected to a voltage detection end of the main control chip; wherein the soil moisture detection device further comprises a second capacitor; one ends of the first capacitor, the first inductor and the first resistor are respectively connected to an end of the second capacitor; and the other end of the second capacitor is connected to one of the two poles.
2. 2 . The soil moisture detection device according to claim 1 , wherein the probe is provided with at least two probes, and the first pole and the second pole are located on two different probes.
3. 3 . A soil detection system, comprising the soil moisture detection device according to claim 2 .
4. 4 . The soil moisture detection device according to claim 2 , wherein the probe is provided with at least three probes; the soil moisture detection device further comprises a functional unit providing on a probe different from the first pole and the second pole, and a signal output end of the functional unit is connected to a functional detection end of the main control chip; wherein the functional unit is a temperature sensing unit or a pH waveform detection unit.
5. 5 . A soil detection system, comprising the soil moisture detection device according to claim 4 .
6. 6 . The soil moisture detection device according to claim 4 , further comprising a temperature sensing unit, an output end of the temperature sensing unit is connected to a temperature detection end of the main control chip.
7. 7 . A soil detection system, comprising the soil moisture detection device according to claim 6 .
8. 8 . The soil moisture detection device according to claim 6 , further comprising a switching unit, wherein an input end of the switching unit is connected to the output end of the waveform detection unit, and the other input end of the switching unit is connected to an end of the temperature sensing unit or PH waveform detection unit; an output end of the switching unit is connected to the voltage detection end of the main control chip, and a control end of the switching unit is connected to a control end of the main control chip.
9. 9 . A soil detection system, comprising the soil moisture detection device according to claim 8 .
10. 10 . The soil moisture detection device according to claim 8 , further comprising a switching unit, wherein an input end of the switching unit is connected to the output end of the waveform detection unit, and the other input end of the switching unit is connected to an end of the temperature sensing unit or PH waveform detection unit; an output end of the switching unit is connected to the voltage detection end of the main control chip, and a control end of the switching unit is connected to a control end of the main control chip.
11. 11 . A soil detection system, comprising the soil moisture detection device according to claim 10 .
12. 12 . The soil moisture detection device according to claim 1 , wherein the first pole and the second pole are provided on a same probe.
13. 13 . A soil detection system, comprising the soil moisture detection device according to claim 12 .
14. 14 . The soil moisture detection device according to claim 12 , further comprising a pH waveform detection unit, which is provided between two poles, and an output end of the pH waveform detection unit is connected to a pH detection end of the main control chip.
15. 15 . A soil detection system, comprising the soil moisture detection device according to claim 14 .
16. 16 . The soil moisture detection device according to claim 1 , further comprising a display unit and a wireless transmission unit, wherein the wireless transmission unit is connected to the main control chip and transmits humidity parameters to the display unit through the wireless transmission unit.
17. 17 . The soil moisture detection device according to claim 1 , wherein the output end of the waveform detection unit is connected to the voltage detection end of the main control chip through a second resistor or a follower circuit unit.
18. 18 . The soil moisture detection device according to claim 1 , the oscillation signal source is a crystal oscillator or MCU.
19. 19 . A soil detection system, comprising the soil moisture detection device according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202311382808.6, filed on Oct. 24, 2023, which is hereby incorporated by reference in its entirety. TECHNICAL FIELD The present disclosure relates to the field of soil moisture detection technologies, and in particular, to a soil moisture detection device and system. BACKGROUND The existing soil hygrometers is resistance type, which involves inserting two metal probes into the soil and measuring soil moisture by creating a voltage difference between two electrodes. This involves controlling a small amount of current between the two electrodes and calculating a change in resistance value. By associating the change with soil moisture, the soil moisture can be measured. The principle is that as a moisture content in the soil increases, the number of ions in water correspondingly increases, that is, a loading capacity becomes stronger. By detecting a relative number of loaded ions, the humidity of the soil can be obtained. However, in practice, even if the soil contains same moisture content, the number of ions may not be the same, and an ability of current flowing may also be different. This may result in different soils with the same humidity, and different humidity results can be detected. Therefore, resistance type soil hygrometer has a problem of poor measurement accuracy. For example, CN216350474U, entitled with soil moisture, conductivity, and temperature monitoring device, the device includes a power module for supplying power to the device; contact electrodes for contacting with soil and detecting moisture and electrical conductivity in the soil; a moisture detection module for detecting soil moisture, which is composed of three stainless steel metal rods and connected to internal circuits. When collecting soil conductivity, a microcontroller sends I2C bus commands through EC-SCL and EC-SDA pins of AD5933 to initiate impedance conversion. After conversion, an impedance value of the equivalent impedance RX is read, and the soil conductivity is calculated. Thus, the measurement of soil moisture is realized. This measurement method has the aforementioned issues. SUMMARY Therefore, it is necessary to provide a soil moisture detection device to improve accuracy of soil moisture detection. To achieve the above objectives, the present disclosure provides a soil moisture detection device, which includes a probe providing with an electrode and contacting soil; a first capacitor, a first inductor, a first resistor, a waveform detection unit, a main control chip, and an oscillation signal source; the electrode includes a first pole and a second pole; an output end of the oscillation signal source is electrically connected to an end of the first resistor, an input end of the waveform detection unit, and the first pole through the first capacitor, the first inductor; the second pole is grounded; and an output end of the waveform detection unit is connected to a voltage detection end of the main control chip. In an embodiment of the present disclosure, the probe is provided with at least two probes, and the first pole and the second pole are located on two different probes. In an embodiment of the present disclosure, the probe is provided with at least three probes; the soil moisture detection device further includes a functional unit providing on a probe different from the first pole and the second pole, and a signal output end of the functional unit is connected to a functional detection end of the main control chip; the functional unit is a temperature sensing unit or a pH waveform detection unit. In an embodiment of the present disclosure, the first pole and the second pole are provided on a same probe. In an embodiment of the present disclosure, the soil moisture detection device further includes a temperature sensing unit, an output end of the temperature sensing unit is connected to a temperature detection end of the main control chip; or the soil moisture detection device further includes a pH waveform detection unit, which is provided between two poles, and an output end of the pH waveform detection unit is connected to a pH detection end of the main control chip. In an embodiment of the present disclosure, the soil moisture detection device further includes a switching unit, an input end of the switching unit is connected to the output end of the waveform detection unit, and the other input end of the switching unit is connected to an end of the temperature sensing unit or PH waveform detection unit; an output end of the switching unit is connected to the voltage detection end of the main control chip, and a control end of the switching unit is connected to a control end of the main control chip. In an embodiment of the present disclosure, the soil moisture detection device further includes a display unit and a wireless transmission unit, the wireless transmission unit is connected to the main control