CN214669046U - Conduit type soil moisture content monitoring device - Google Patents
Conduit type soil moisture content monitoring device Download PDFInfo
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- CN214669046U CN214669046U CN202120139513.6U CN202120139513U CN214669046U CN 214669046 U CN214669046 U CN 214669046U CN 202120139513 U CN202120139513 U CN 202120139513U CN 214669046 U CN214669046 U CN 214669046U
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Abstract
The utility model relates to a conduit-type soil moisture content monitoring device, which comprises a moisture content detecting component, a temperature monitoring component, a signal monitoring circuit and a communication circuit; the soil moisture content detection assembly comprises a probe, a hollow pipe and an oscillating circuit, the probe comprises at least one pair of metal rings, the pair of metal rings are arranged in the hollow pipe at intervals, the temperature monitoring assembly is arranged in the hollow pipe, the pair of metal rings and the temperature monitoring assembly are respectively electrically connected with the input end of the signal monitoring circuit, the output end of the signal monitoring circuit is electrically connected with the input end of the communication circuit, and the output end of the communication circuit is in communication connection with an external receiving terminal. The utility model discloses a with probe and temperature monitoring subassembly setting in the hollow tube to bury in the soil, and cooperate signal monitoring circuit can directly survey moisture and the temperature of the multilayer degree of depth in the soil, the installation is simple, does not destroy the section, and is little to the soil body disturbance, has realized the measurement of incessant many degrees of depth, has shortened measuring time, has improved measurement of efficiency.
Description
Technical Field
The utility model relates to a soil parameter measurement technical field especially relates to a ducted soil moisture content monitoring devices.
Background
Proper moisture content of soil is an important condition for plant growth, and crop growth is affected by excessive or insufficient moisture content. The soil humidity is too low, so that soil drought is formed, photosynthesis can not be normally carried out, and the yield and the quality of crops are reduced; too high soil humidity deteriorates soil air permeability, affects the activities of soil microorganisms, and hinders the life activities of crop roots such as respiration and growth.
The soil moisture measurement mode includes direct measurement and indirect measurement. The common direct measurement method is a drying and weighing method, samples need to be taken to a laboratory for drying measurement and calculation, and the method has high precision, but has long time consumption and poor real-time property, and is not suitable for continuous multilayer depth measurement occasions. Indirect measurement methods include dielectric methods, and commonly used are frequency domain reflectometry and time domain reflectometry.
At present, most devices for measuring soil moisture are in probe contact type measurement, the depth of soil to be measured is limited, and the soil is easily corroded for a long time, so that the measurement precision is influenced.
Disclosure of Invention
The utility model aims to solve the technical problem that not enough to above-mentioned prior art provides a ducted soil moisture content monitoring devices, and the device buries soil back, the moisture and the temperature of the multilayer degree of depth in the direct survey soil. The installation is simple, does not destroy the section, and is little to the soil body disturbance. The device realizes the measurement of uninterrupted multiple depths, shortens the measurement time and improves the measurement efficiency.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a conduit type soil moisture content monitoring device comprises a moisture content detection assembly, a temperature monitoring assembly, a signal monitoring circuit and a communication circuit, wherein the signal monitoring circuit is used for monitoring and processing signals output by the detection assembly;
the soil moisture content detection assembly comprises a probe, a hollow pipe, an oscillating circuit and a PCB (printed circuit board), wherein the probe comprises at least one pair of metal rings, the metal rings are arranged in the hollow pipe at intervals, the metal rings are arranged in the hollow pipe and are electrically connected with two input ends of the signal monitoring circuit in a corresponding mode, the temperature monitoring assembly, the signal monitoring circuit and the communication circuit are arranged in the hollow pipe on the PCB, the output end of the temperature monitoring assembly is electrically connected with another input end of the signal monitoring circuit, the output end of the signal monitoring circuit is electrically connected with the input end of the communication circuit, and the output end of the communication circuit is in communication connection with an external receiving terminal.
The utility model has the advantages that: the utility model discloses a ducted soil moisture content monitoring devices, through with the probe, the temperature monitoring subassembly, signal monitoring circuit and communication circuit set up in the hollow tube, and bury in soil, the signal monitoring circuit can directly survey the moisture and the temperature of the multilayer degree of depth in the soil according to the signal of probe and temperature monitoring subassembly collection, the installation is simple, do not destroy the section, it is little to the soil body disturbance, the measurement of incessant many degree of depth has been realized, measuring time has been shortened, the measurement of efficiency is improved, probe and soil non-contact measurement, can not influence measurement accuracy because of soil corrosion, the product life is prolonged.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further: the number of the metal rings is multiple pairs, and the multiple pairs of the metal rings are arranged in the hollow pipe at intervals along the length direction of the hollow pipe.
The beneficial effects of the further scheme are as follows: through will many pairs of the becket along the length direction of hollow tube each other the interval sets up in the hollow tube, can measure to the humidity of the different degree of depth of soil like this to be favorable to improving measurement accuracy.
Further: the signal monitoring circuit comprises a preprocessing circuit, a signal processing circuit and a main control circuit, wherein the preprocessing circuit is used for performing frequency division processing on the signal output by the detection assembly;
the output end of the oscillating circuit is electrically connected with the input end of the preprocessing circuit, the output end of the preprocessing circuit is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit is electrically connected with one signal input end of the main control circuit, the output end of the temperature monitoring assembly is electrically connected with the other signal output and input end of the main control circuit, and the output end of the main control circuit is electrically connected with the input end of the communication circuit.
The beneficial effects of the further scheme are as follows: the preprocessing circuit can perform frequency division processing on the sine wave oscillation signals output by the oscillation circuit, and the signal processing circuit converts the sine wave oscillation signals into square wave signals, so that the main control circuit can calculate the frequency of the square wave signals conveniently according to the square wave signals, the main control circuit calculates a function relation of soil humidity and signal frequency by adopting a data fitting method, and the soil humidity can be calculated according to the function relation.
Further: the temperature monitoring subassembly adopts the temperature sensor that the model is DS18B20, temperature sensor sets up in the hollow tube, just temperature sensor with the inner wall contact setting of hollow tube.
The beneficial effects of the further scheme are as follows: by placing the temperature sensor in contact with the inner wall of the hollow tube, this allows the temperature sensor to measure the temperature in the soil relatively accurately.
Further: the oscillating circuit comprises a common-mode inductor T1, an inductor L1, a resistor R4, a resistor R5, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C10 and an oscillator chip U4, wherein a pair of metal rings are respectively and electrically connected with a pin 1 and a pin 4 of the common-mode inductor T1, a pin 2 and a pin 3 of the common-mode inductor T1 are respectively and electrically connected with two ends of the inductor L1, a pin 2 of the common-mode inductor T1 is electrically connected with a signal input end of the oscillator chip U4, a pin 3 of the common-mode inductor T1 is electrically connected with a feedback input end of the oscillator chip U4 through the resistor R5, a feedback input end of the oscillator chip U4 is grounded through the capacitor C10, an automatic gain control input end of the oscillator chip U4 is grounded through the capacitor C6, a power supply input end of the oscillator chip U4 is electrically connected with an external power supply VCC, the power supply input end of the oscillator chip U4 is grounded through the capacitor C5, the output end of the oscillator chip U4 is electrically connected with the input end of the preprocessing circuit through the capacitor C8, and the ground end of the oscillator chip U4 is grounded.
The beneficial effects of the further scheme are as follows: LC oscillation is formed by the probe and the oscillator circuit to generate high-frequency sine wave oscillation signals, and when the soil humidity changes, the corresponding soil dielectric constant is different, the equivalent capacitance of the probe also changes, and the oscillation frequency of the oscillator is indirectly changed.
Further: the preprocessing circuit comprises a capacitor C4, a resistor R9, a capacitor C7, a capacitor C9, a resistor R10 and a frequency division chip U3, the output end of the oscillating circuit is electrically connected with the input end of the frequency dividing chip, the power supply input end of the frequency dividing chip U3 is electrically connected with an external power supply VCC, the power supply input end of the frequency division chip U3 is grounded through the capacitor C4, the first frequency division control input end and the first frequency division control input end of the frequency division chip U3 are both grounded, the third frequency division control input end of the frequency division chip U3 is electrically connected with an external power supply VCC through the resistor R9, the output end of the frequency division chip U3 is grounded through the resistor R10, the output end of the frequency division chip U3 is electrically connected with the input end of the signal processing circuit through the capacitor C7, the grounding end of the frequency division chip U3 is grounded, and the XX end of the frequency division chip U3 is grounded through the capacitor C9.
The beneficial effects of the further scheme are as follows: the preprocessing circuit can be used for carrying out frequency reduction processing on the sine wave oscillating signal output by the oscillating circuit.
Further: the signal processing circuit comprises a resistor R2, a resistor R3, a capacitor C2 and an operational amplifier U1, wherein a non-inverting input end of the operational amplifier U1 is electrically connected with an output end of the preprocessing circuit, an inverting input end of the operational amplifier U1 is electrically connected with an external power supply VCC through the resistor R2, an inverting input end of the operational amplifier U1 is grounded through the resistor R3, a positive power supply input end of the operational amplifier U1 is electrically connected with the external power supply VCC, a positive power supply input end of the operational amplifier U1 is grounded through the capacitor C2, a negative power supply input end of the operational amplifier U1 is grounded, and an output end of the operational amplifier U1 is electrically connected with a signal input end of the main control circuit.
The beneficial effects of the further scheme are as follows: the signal processing circuit can convert the signals subjected to frequency reduction processing into square wave signals, so that the main control circuit can conveniently collect the signals; the main control circuit collects square wave frequency signals, and corresponding humidity values can be calculated.
Further: the main control circuit adopts a 51-series single chip microcomputer.
Further: and the communication circuit adopts an RS485 communication module.
Drawings
Fig. 1 is a schematic structural view of a conduit-type soil moisture content monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a conduit-type soil moisture content monitoring device according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an oscillator circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a preprocessing circuit according to an embodiment of the present invention;
fig. 5 is a circuit schematic diagram of a signal processing circuit according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a probe 2, a hollow pipe 3 and a PCB;
11. a metal ring.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1 and 2, a conduit-type soil moisture monitoring device includes a moisture detecting component, a temperature monitoring component, a signal monitoring circuit for monitoring and processing the signal output by the detecting component, and a communication circuit;
the subassembly is surveyed to soil moisture content includes probe 1, hollow tube 2, oscillating circuit and PCB board 3, the probe includes at least a pair of becket 11, and is a pair of becket 11 relative interval sets up in the hollow tube 2, and a pair of becket 11 respectively with two inputs of signal monitoring circuit correspond the electricity and connect, temperature monitoring subassembly, signal monitoring circuit and communication circuit all set up in the hollow tube 2 on the PCB board 3, the output of temperature monitoring subassembly with another input electricity of signal monitoring circuit is connected, the output of signal monitoring circuit with communication circuit's input electricity is connected, communication circuit's output and outside receiving terminal communication connection.
The utility model discloses a ducted soil moisture content monitoring devices is through setting up probe and temperature monitoring subassembly in hollow tube to bury in soil, and cooperate signal monitoring circuit can directly survey moisture and the temperature of the multilayer degree of depth in the soil, the installation is simple, does not destroy the section, and is little to the soil body disturbance, has realized the measurement of incessant many degree of depth, has shortened measuring time, has improved measurement of efficiency.
In one or more embodiments of the present invention, the number of the metal rings 11 is a plurality of pairs, and the plurality of pairs of the metal rings 11 are disposed in the hollow tube 2 at intervals along the length direction of the hollow tube 2. Through will many pairs the becket 11 is along the length direction of hollow tube 2 separates the setting each other and is in the hollow tube 2, can measure to the humidity of the different degree of depth of soil like this to be favorable to improving measurement accuracy, probe and soil non-contact measurement can not influence measurement accuracy because of soil corrosion, have improved product life.
The utility model discloses in, the measurement principle of soil moisture: based on the FDR frequency domain reflection principle, the dielectric constant of the medium is measured according to the change of the oscillation frequency of the electromagnetic wave in different media by utilizing the oscillation of an LC circuit, and the soil moisture is calculated through a certain corresponding relation. The probe is buried in the soil, the corresponding soil dielectric constant is different when the soil humidity changes, and the capacitance of the probe is changed along with the change of the soil humidity, so that the oscillation frequency of the oscillator is indirectly changed, and the moisture content is measured by the change of the capacitance. How to calculate specifically is prior art, and it is no longer elaborated on in this utility model to this is also not the content that the utility model claims.
It needs to point out very much, the utility model discloses a ducted soil moisture content monitoring devices can be according to the needs of measuring the soil degree of depth, and the soil layering of the different degree of depth is measured to extension becket 11 and temperature sensor, has shown five layers becket 11's situation in FIG. 1, and the soil degree of depth that corresponds respectively is 10cm, 20cm, 30cm, 40cm, 50cm, can set up and adjust in a flexible way as required in reality.
The embodiment of the utility model provides an in, the hollow tube adopts high-quality plastic tubing, and the probe dress is in the plastic hollow tube, and non-contact measurement does not receive the corruption influence of acid-base salt in the soil, and the measurement depth is customizable, makes things convenient for the rapid survey of multilayer degree of depth soil. The embodiment of the utility model provides an in, hollow tube 2 is the upper end opening lower extreme and seals the setting to cooperate the upper cover, can seal the upper end of hollow tube 2, wherein, the activity of PCB board 3 sets up in hollow tube 2, conveniently packs into PCB board 3 in the hollow tube 2, perhaps takes out from hollow tube 2, and becket 11 sets up on the inner wall of setting at hollow tube 2, works as PCB board 3 packs into during in the hollow tube 2, all beckets 11 are once passed to PCB board 3.
In one or more embodiments of the present invention, the signal monitoring circuit includes a preprocessing circuit, a signal processing circuit, and a main control circuit, which are used for performing frequency division processing on the signal output by the detection component; the output end of the oscillating circuit is electrically connected with the input end of the preprocessing circuit, the output end of the preprocessing circuit is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit is electrically connected with one signal input end of the main control circuit, the output end of the temperature monitoring assembly is electrically connected with the other signal output and input end of the main control circuit, and the output end of the main control circuit is electrically connected with the input end of the communication circuit. The preprocessing circuit can perform frequency division processing on the sine wave oscillation signals output by the oscillation circuit, and the signal processing circuit converts the sine wave oscillation signals into square wave signals, so that the main control circuit can calculate the frequency of the square wave signals conveniently according to the square wave signals, the main control circuit calculates a function relation of soil humidity and signal frequency by adopting a data fitting method, and the soil humidity can be calculated according to the function relation.
Optionally, in one or more embodiments of the present invention, the temperature monitoring assembly employs a temperature sensor of model DS18B20, the temperature sensor is disposed in the hollow tube, and the temperature sensor is disposed in contact with the inner wall of the hollow tube. By placing the temperature sensor in contact with the inner wall of the hollow tube, this allows the temperature sensor to measure the temperature in the soil relatively accurately.
As shown in fig. 3, in one or more embodiments of the present invention, the oscillation circuit includes a common mode inductor T1, an inductor L1, a resistor R4, a resistor R5, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C10, and an oscillator chip U4, a pair of the metal rings is electrically connected to the pin 1 and the pin 4 of the common mode inductor T1, the pin 2 and the pin 3 of the common mode inductor T1 are electrically connected to two ends of the inductor L1, the pin 2 of the common mode inductor T1 is electrically connected to the signal input terminal of the oscillator chip U4, the pin 3 of the common mode inductor T1 is electrically connected to the feedback input terminal of the oscillator chip U4 through the resistor R5, the feedback input terminal of the oscillator chip U4 is electrically connected to ground through the capacitor C10, the automatic gain control input terminal of the oscillator chip U4 is electrically connected to ground through the capacitor C6, the power supply input terminal of the oscillator chip U4 is electrically connected to VCC, the power supply input end of the oscillator chip U4 is grounded through the capacitor C5, the output end of the oscillator chip U4 is electrically connected with the input end of the preprocessing circuit through the capacitor C8, and the ground end of the oscillator chip U4 is grounded. LC oscillation is formed by the probe and the oscillator circuit to generate high-frequency sine wave oscillation signals, and when the soil humidity changes, the corresponding soil dielectric constant is different, the equivalent capacitance of the probe also changes, and the oscillation frequency of the oscillator is indirectly changed. In the embodiment of the present invention, the oscillator chip U4 adopts the oscillation chip whose existing model is MC100EL 1648D.
As shown in fig. 4, in one or more embodiments of the present invention, the preprocessing circuit includes a capacitor C4, a resistor R9, a capacitor C7, a capacitor C9, a resistor R10, and a frequency-dividing chip U3, an output terminal of the oscillating circuit is electrically connected to an input terminal of the frequency-dividing chip, a power input terminal of the frequency-dividing chip U3 is electrically connected to an external power VCC, a power input terminal of the frequency-dividing chip U3 is grounded via the capacitor C4, a first frequency-dividing control input terminal and a first frequency-dividing control input terminal of the frequency-dividing chip U3 are both grounded, a third frequency-dividing control input terminal of the frequency-dividing chip U3 is electrically connected to the external power VCC via the resistor R9, an output terminal of the frequency-dividing chip U3 is grounded via the resistor R10, an output terminal of the frequency-dividing chip U3 is electrically connected to an input terminal of the signal processing circuit via the capacitor C7, a ground terminal of the frequency-dividing chip U3 is grounded, the XX end of the frequency division chip U3 is grounded through the capacitor C9. The preprocessing circuit can be used for carrying out frequency reduction processing on the sine wave oscillating signal output by the oscillating circuit. The embodiment of the utility model provides an in, frequency division chip U3 adopts the current model to be MC 12080's frequency division chip.
As shown in fig. 5, in one or more embodiments of the present invention, the signal processing circuit includes a resistor R2, a resistor R3, a capacitor C2 and an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is electrically connected to an output terminal of the preprocessing circuit, an inverting input terminal of the operational amplifier U1 is electrically connected to the external power VCC through the resistor R2, an inverting input terminal of the operational amplifier U1 is grounded through the resistor R3, a positive power input terminal of the operational amplifier U1 is electrically connected to the external power VCC, a positive power input terminal of the operational amplifier U1 is grounded through the capacitor C2, a negative power input terminal of the operational amplifier U1 is grounded, and an output terminal of the operational amplifier U1 is electrically connected to a signal input terminal of the main control circuit. The signal processing circuit can convert the signals subjected to frequency reduction processing into square wave signals, so that the main control circuit can conveniently collect the signals; the main control circuit collects square wave frequency signals, and corresponding humidity values can be calculated. The operational amplifier U1 employs an existing LMV7239M5 operational amplifier chip.
Optionally, in one or more embodiments of the present invention, the main control circuit adopts a 51-series single chip microcomputer.
Optionally, in one or more embodiments of the present invention, the communication circuit employs an RS485 communication module.
The utility model discloses in the device probe part buries soil, the soil dielectric constant that corresponds when soil moisture changes is different, and the electric capacity of probe has also changed thereupon, has indirectly changed the oscillation frequency of oscillator, and LC oscillating circuit's frequency is:
the change of the frequency is influenced by the change of the inductance L and the capacitance C, and the change of the oscillation frequency depends on the change of the capacitance due to the adoption of the fixed inductance value, and the change of the capacitance is influenced by the soil outside the sleeve between the two copper rings, so the water content of the soil can be inverted through the analysis of the frequency.
The utility model discloses but humidity and the temperature of rapid survey measuring multilayer degree of depth soil have improved measurement of efficiency, and probe and soil non-contact measurement can not influence measurement accuracy because of soil corrosion, have improved product life.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. A conduit type soil moisture content monitoring device is characterized by comprising a moisture content detection component, a temperature monitoring component, a signal monitoring circuit and a communication circuit, wherein the signal monitoring circuit is used for monitoring and processing signals output by the detection component;
the soil moisture content detection assembly comprises a probe (1), a hollow tube (2), an oscillating circuit and a PCB (printed circuit board) (3), wherein the probe comprises at least one pair of metal rings (11), the metal rings (11) are arranged in the hollow tube (2) at relative intervals, the metal rings (11) are respectively electrically connected with two corresponding input ends of the signal monitoring circuit, the temperature monitoring assembly, the signal monitoring circuit and the communication circuit are arranged in the hollow tube (2) on the PCB (3), the output end of the temperature monitoring assembly is electrically connected with another input end of the signal monitoring circuit, the output end of the signal monitoring circuit is electrically connected with the input end of the communication circuit, and the output end of the communication circuit is in communication connection with an external receiving terminal.
2. A ducted soil moisture content monitoring device according to claim 1, characterized in that the number of said metal rings (11) is a plurality of pairs, and a plurality of pairs of said metal rings (11) are arranged in said hollow tube (2) at intervals from each other along the length direction of said hollow tube (2).
3. The ducted soil moisture content monitoring device according to claim 1, wherein the signal monitoring circuit comprises a preprocessing circuit for performing frequency division processing on the signal output by the detection component, a signal processing circuit and a main control circuit temperature monitoring component;
the output end of the oscillating circuit is electrically connected with the input end of the preprocessing circuit, the output end of the preprocessing circuit is electrically connected with the input end of the signal processing circuit, the output end of the signal processing circuit is electrically connected with one signal input end of the main control circuit, the output end of the temperature monitoring assembly is electrically connected with the other signal output and input end of the main control circuit, and the output end of the main control circuit is electrically connected with the input end of the communication circuit.
4. The ducted soil moisture content monitoring device according to claim 3, wherein the temperature monitoring assembly is a DS18B20 temperature sensor, the temperature sensor is arranged in the hollow pipe and is in contact with the inner wall of the hollow pipe.
5. The ducted soil moisture content monitoring device according to claim 3, wherein the oscillation circuit comprises a common mode inductor T1, an inductor L1, a resistor R4, a resistor R5, a capacitor C5, a capacitor C6, a capacitor C8, a capacitor C10 and an oscillator chip U4, a pair of the metal rings are electrically connected to No. 1 and No. 4 pins of the common mode inductor T1 respectively, No. 2 and No. 3 pins of the common mode inductor T1 are electrically connected to two ends of the inductor L1 respectively, No. 2 pin of the common mode inductor T1 is electrically connected to a signal input terminal of the oscillator chip U4, No. 3 pin of the common mode inductor T1 is electrically connected to a feedback input terminal of the oscillator chip U4 through the resistor R5, the feedback input terminal of the oscillator chip U4 is grounded through the capacitor C10, an automatic gain control input terminal of the oscillator chip U4 is grounded through the capacitor C6, oscillator chip U4's power input end is connected with external power source VCC electricity, oscillator chip U4's power input end with pass through electric capacity C5 ground connection, oscillator chip U4's output passes through electric capacity C8 with preprocessing circuit's input electricity is connected, oscillator chip U4's ground connection.
6. The ducted soil moisture content monitoring device according to claim 5, wherein the pre-processing circuit comprises a capacitor C4, a resistor R9, a capacitor C7, a capacitor C9, a resistor R10 and a frequency-dividing chip U3, the output terminal of the oscillating circuit is electrically connected with the input terminal of the frequency-dividing chip, the power input terminal of the frequency-dividing chip U3 is electrically connected with an external power VCC, the power input terminal of the frequency-dividing chip U3 is grounded through the capacitor C4, the first frequency-dividing control input terminal and the first frequency-dividing control input terminal of the frequency-dividing chip U3 are both grounded, the third frequency-dividing control input terminal of the frequency-dividing chip U3 is electrically connected with the external power VCC through the resistor R9, the output terminal of the frequency-dividing chip U3 is grounded through the resistor R10, and the output terminal of the frequency-dividing chip U3 is electrically connected with the input terminal of the signal processing circuit through the capacitor C7, the grounding end of the frequency division chip U3 is grounded, and the XX end of the frequency division chip U3 is grounded through the capacitor C9.
7. The ducted soil moisture monitoring device according to claim 6, wherein said signal processing circuit comprises a resistor R2, a resistor R3, a capacitor C2 and an operational amplifier U1, wherein the non-inverting input terminal of said operational amplifier U1 is electrically connected to the output terminal of said preprocessing circuit, the inverting input terminal of said operational amplifier U1 is electrically connected to the external power source VCC through said resistor R2, the inverting input terminal of said operational amplifier U1 is grounded through said resistor R3, the positive power input terminal of said operational amplifier U1 is electrically connected to the external power source VCC, the positive power input terminal of said operational amplifier U1 is grounded through said capacitor C2, the negative power input terminal of said operational amplifier U1 is grounded, and the output terminal of said operational amplifier U1 is electrically connected to a signal input terminal of said main control circuit.
8. The conduit-type soil moisture content monitoring device of claim 3, wherein the main control circuit adopts 51 series single-chip microcomputer.
9. A ducted soil moisture content monitoring device as claimed in any one of claims 1 to 7, wherein the communication circuit employs an RS485 communication module.
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| CN202120139513.6U CN214669046U (en) | 2021-01-19 | 2021-01-19 | Conduit type soil moisture content monitoring device |
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| CN202120139513.6U CN214669046U (en) | 2021-01-19 | 2021-01-19 | Conduit type soil moisture content monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117405861A (en) * | 2023-12-15 | 2024-01-16 | 逸文环境发展有限公司 | Be used for prosthetic soil detection device of soil heavy metal soil moisture content |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117405861A (en) * | 2023-12-15 | 2024-01-16 | 逸文环境发展有限公司 | Be used for prosthetic soil detection device of soil heavy metal soil moisture content |
| CN117405861B (en) * | 2023-12-15 | 2024-03-08 | 逸文环境发展有限公司 | Be used for prosthetic soil detection device of soil heavy metal soil moisture content |
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