CN210376215U - Soil humiture and conductivity measurement control system - Google Patents
Soil humiture and conductivity measurement control system Download PDFInfo
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- CN210376215U CN210376215U CN201921085544.7U CN201921085544U CN210376215U CN 210376215 U CN210376215 U CN 210376215U CN 201921085544 U CN201921085544 U CN 201921085544U CN 210376215 U CN210376215 U CN 210376215U
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Abstract
The utility model belongs to the technical field of the monitoring control system, a soil humiture and conductivity measurement control system is proposed, which comprises a controller, the controller is connected with conductivity measurement module, humidity measurement module, temperature measurement module, conductivity measurement module includes the conductivity measurement signal input part that connects gradually with the controller, filter circuit, first fortune circuit, second fortune circuit, rectifier circuit, signal conditioning circuit, second fortune circuit connection has conductivity measurement probe, signal conditioning circuit is connected with the controller, humidity measurement module includes the excitation source circuit of being connected with the controller, humidity measurement probe, the excitation source circuit, humidity measurement probe all with the exclusive OR gate circuit connection, exclusive OR gate circuit is connected with the controller. Through above-mentioned technical scheme, the problem among the prior art has been solved.
Description
Technical Field
The utility model belongs to the technical field of the monitor and control system, a soil humiture and conductivity measurement control system is related to.
Background
The existing sensor for measuring soil humidity in the current market is single, has single parameter, double parameters and few multi-parameter, thereby resulting in less measurement parameters or needing to set a plurality of sampling products to realize the measurement of each parameter. And the circuit structure of the conventional product is complicated, an analog circuit is adopted for measurement, a plurality of components are required, the cost is high, and the components are easy to damage, so that the measurement is unstable or cannot be measured.
SUMMERY OF THE UTILITY MODEL
The utility model provides a soil humiture and conductivity measurement control system has solved the problem among the prior art.
The technical scheme of the utility model is realized like this:
a soil temperature, humidity and conductivity measurement control system comprises
A controller connected with a conductivity measuring module, a humidity measuring module and a temperature measuring module,
the conductivity measuring module comprises a conductivity measuring signal input end, a filter circuit, a first operational amplifier circuit, a second operational amplifier circuit, a rectifying circuit and a signal regulating circuit which are sequentially connected with the controller, the second operational amplifier circuit is connected with a conductivity measuring probe, the signal regulating circuit is connected with the controller,
the humidity measurement module comprises an excitation source circuit and a humidity measurement probe which are connected with the controller, the excitation source circuit and the humidity measurement probe are both connected with an exclusive-OR gate circuit, and the exclusive-OR gate circuit is connected with the controller.
As a further technical solution, the first operational amplifier circuit includes a first operational amplifier connected to the filter circuit, the first operational amplifier is connected to the second operational amplifier circuit,
the second operational amplifier circuit comprises a second operational amplifier and a third operational amplifier which are sequentially connected with the first operational amplifier, the second operational amplifier is also connected with the conductivity measuring probe, and the third operational amplifier is connected with the rectifying circuit.
As a further technical solution, the rectifying circuit includes a rectifying diode connected to the third operational amplifier, the rectifying diode is connected to the signal conditioning circuit,
the signal conditioning circuit includes a fourth operational amplifier connected to the rectifier diode, the fourth operational amplifier being connected to the controller.
As a further technical solution, the filter circuit includes a first resistor and a first capacitor sequentially connected to the conductivity measurement signal input terminal, the first capacitor is connected to the inverting input terminal of the first operational amplifier, the non-inverting input terminal of the first operational amplifier is connected to ground, the output terminal of the first operational amplifier is connected to the non-inverting input terminal of the second operational amplifier,
the inverting input end of the second operational amplifier is connected with the conductivity measuring probe, the output end of the second operational amplifier is connected with the non-inverting input end of the third operational amplifier,
the inverting input end of the third operational amplifier is connected with the ground, the output end of the third operational amplifier is connected with the anode of the rectifier diode, the cathode of the rectifier diode is connected with the non-inverting input end of the fourth operational amplifier, the inverting input end of the fourth operational amplifier is connected with the ground, and the output end of the fourth operational amplifier is connected with the controller.
As a further technical solution, the excitation source circuit includes a voltage-controlled oscillator connected to the controller, the voltage-controlled oscillator is connected to the humidity measurement probe,
the exclusive-OR gate circuit comprises an exclusive-OR gate logic chip connected with the voltage-controlled oscillator and the humidity measuring probe, and the exclusive-OR gate logic chip is connected with the controller.
As a further technical scheme, the controller is further connected with a power supply module, the power supply module comprises a voltage input end, the voltage input end is sequentially connected with a first voltage conversion circuit and a second voltage conversion circuit, the second voltage conversion circuit is connected with a third voltage conversion circuit and a fourth voltage conversion circuit, the first voltage conversion circuit is further connected with a polarity reversal power supply converter,
the first voltage conversion circuit and the polarity inversion power converter are connected with the first operational amplifier,
the second voltage conversion circuit is connected with the controller,
the third voltage conversion circuit is connected with the controller, the signal conditioning circuit and the temperature measurement module,
the fourth voltage conversion circuit is connected with the excitation source circuit.
As a further technical solution, the temperature measuring module includes a second resistor and an NTC thermistor sequentially connected to the third voltage converting circuit, and the NTC thermistor is connected to the controller.
As a further technical solution, the controller is further connected with a communication module, the communication module includes a transceiver connected with the controller, and the transceiver is connected with a control terminal for remote control.
As a further technical scheme, the specific model of the controller is STM32F100C8T 6; the specific models of the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier are LM 224; the specific model of the voltage-controlled oscillator is LTC 6905-100; the specific model of the exclusive-OR gate logic chip is 74LVC1G86 GW; the specific model of the polarity reversal power converter is ICL 7660; the specific model of the transceiver is SN65HVD 12.
The utility model discloses a theory of operation and beneficial effect do:
1. the utility model provides a controller is connected with conductivity measurement module, humidity measurement module, temperature measurement module, consequently can realize the measurement to soil conductivity, soil humidity, soil temperature, and is multiple functional, can be applicable to more application scenarios, satisfies different user demands.
When the soil conductivity needs to be measured, the conductivity measuring probe is inserted into soil, the controller outputs a sinusoidal signal to the input end of a conductivity measuring signal, the sinusoidal signal is filtered by the filter circuit, then the sinusoidal signal becomes an alternating positive-negative alternating current signal through the blocking coupling capacitor and is transmitted to the first operational amplifier circuit, then the alternating current signal is transmitted to the second operational amplifier circuit, the output signal of the second operational amplifier circuit can be influenced by the change of the conductivity impedance of the soil, the output signal changes along with the change of the soil conductivity, the rectification circuit rectifies the output alternating current signal into a pulsating half-wave signal, the signal regulating circuit regulates the pulsating half-wave signal, the signal is regulated into a signal suitable for being collected by the controller and is transmitted to the controller, and therefore the measurement of the soil conductivity is completed.
When the soil humidity is measured, the humidity measuring probe is inserted into soil, the dielectric constant of the soil changes along with the change of the moisture to form a frequency change signal, the frequency change signal is fed back to the exclusive-OR gate circuit, the frequency of the frequency change signal is different from the frequency of the signal input to the exclusive-OR gate circuit by the excitation source circuit, and the exclusive-OR gate circuit changes along with the input change. When moisture exists in soil, the XOR gate circuit outputs a signal with a variable high and low level, and after filtering, a stable direct current voltage signal is output to the controller, so that the measurement of the soil humidity is realized.
2. The utility model provides a sinusoidal signal of controller output, first resistance in filter circuit, the low pass filtering of first electric capacity is under the effect, become positive negative alternating current signal through blocking coupling electric capacity, it is put to carry out fortune through first operational amplifier again, later in proper order through second operational amplifier, the fortune of third operational amplifier is put, the conductivity impedance's of soil change influences third operational amplifier's output signal, output signal changes along with the change of soil conductivity, alternating signal rectification after measuring soil conductivity becomes the pulsation half-wave signal through the rectifier diode. And the fourth operational amplifier adjusts the pulsating half-wave signal, so that the signal is adjusted to be suitable for the signal acquired by the controller, and the measurement of the soil conductivity is realized.
3. The utility model provides a voltage controlled oscillator produces high frequency signal as the excitation source at the during operation, and the dielectric constant of soil changes along with the change of moisture, and the frequency of excitation source transmission forms the signal of frequency change after advancing resistance, electric capacity and soil, and this signal feedback is to exclusive-or gate logic chip, and this signal is different with the frequency that the excitation source input exclusive-or gate logic chip, leads to exclusive-or gate logic chip to change along with the change of input. When moisture exists in soil, the XOR gate logic chip outputs signals with high and low level changes, and a first-order low-pass filter circuit is connected behind the XOR gate logic chip, so that stable direct-current voltage signals can be output to the controller due to high frequency, and the system can work stably.
4. The utility model provides a controller is connected with power module, and power module includes voltage input end, and the voltage of voltage input end input carries out voltage conversion through first voltage conversion circuit, second voltage conversion circuit, third voltage conversion circuit, fourth voltage conversion circuit, thereby converts into different voltage value and can stabilize the power supply for each module in the system to guarantee the steady operation of system.
5. The utility model provides a temperature measurement module adopts NTC thermistor to gather the temperature, and the temperature rises, and thermistor value reduces, and the temperature reduces, and thermistor value risees, adopts second resistance and NTC thermistor to establish ties again, according to the magnitude of voltage of partial pressure, reachs soil temperature and passes to the controller, realizes the measurement to soil temperature.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a schematic circuit diagram of a controller according to the present invention;
fig. 3 is a schematic circuit diagram of the conductivity measuring module according to the present invention;
FIG. 4 is a schematic circuit diagram of the humidity measuring module of the present invention;
fig. 5 is a schematic circuit diagram of a power module according to the present invention;
fig. 6 is a schematic circuit diagram of the temperature measuring module according to the present invention;
fig. 7 is a schematic circuit diagram of a communication module according to the present invention;
in the figure: 1-a controller, 2-a conductivity measurement module, 21-a conductivity measurement signal input terminal, 22-a filter circuit, 221-a first resistor, 222-a first capacitor, 23-a first operational amplifier circuit, 231-a first operational amplifier, 24-a second operational amplifier circuit, 241-a second operational amplifier, 242-a third operational amplifier, 25-a rectifier circuit, 251-a rectifier diode, 26-a signal conditioning circuit, 261-a fourth operational amplifier, 27-a conductivity measurement probe, 3-a humidity measurement module, 31-a drive source circuit, 311-a voltage-controlled oscillator, 32-a humidity measurement probe, 33-an exclusive OR gate circuit, 331-an exclusive OR gate logic chip, 4-a temperature measurement module, 5-a power supply module, 51-a voltage input terminal, 52-a first voltage conversion circuit, 53-a second voltage conversion circuit, 54-a third voltage conversion circuit, 55-a fourth voltage conversion circuit, 56-a polarity reversal power converter, 6-a communication module and 7-a control terminal.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in FIGS. 1 to 7, a soil temperature, humidity and conductivity measurement control system comprises
A controller 1, wherein the controller 1 is connected with a conductivity measuring module 2, a humidity measuring module 3 and a temperature measuring module 4,
the conductivity measurement module 2 comprises a conductivity measurement signal input end 21, a filter circuit 22, a first operational amplifier circuit 23, a second operational amplifier circuit 24, a rectifying circuit 25 and a signal regulating circuit 26 which are sequentially connected with the controller 1, the second operational amplifier circuit 24 is connected with a conductivity measurement probe 27, the signal regulating circuit 26 is connected with the controller 1,
the humidity measuring module 3 comprises an excitation source circuit 31 and a humidity measuring probe 32 which are connected with the controller 1, the excitation source circuit 31 and the humidity measuring probe 32 are both connected with an exclusive-or gate circuit 33, and the exclusive-or gate circuit 33 is connected with the controller 1.
The utility model provides a controller 1 is connected with conductivity measurement module 2, humidity measurement module 3, temperature measurement module 4, consequently can realize the measurement to soil conductivity, soil humidity, soil temperature, and is multiple functional, can be applicable to more application scenarios, satisfies different user demands.
When the soil conductivity needs to be measured, the conductivity measuring probe 27 is inserted into the soil, the controller 1 outputs a sinusoidal signal to the input end of the conductivity measuring signal, the sinusoidal signal is filtered by the filter circuit 22, then the sinusoidal signal becomes an alternating-current signal with positive and negative alternation through the blocking coupling capacitor and is transmitted to the first operational amplifier circuit 23 for operational amplification, then the alternating-current signal is transmitted to the second operational amplifier circuit for operational amplification, the output signal of the second operational amplifier circuit 24 can be influenced by the change of the conductivity impedance of the soil, the output signal changes along with the change of the soil conductivity, the rectifier circuit 25 rectifies the output alternating-current signal into a pulsating half-wave signal, the signal regulating circuit regulates the pulsating half-wave signal, the signal is regulated to be suitable for the signal collected by the controller 1 and is transmitted to the, therefore, the measurement of the conductivity of the soil is completed, the measurement circuit is stable and reliable, the structure is simple, and the damage rate of components can be reduced.
When the humidity of soil is measured, the humidity measuring probe 32 is inserted into the soil, the dielectric constant of the soil changes with the change of the moisture to form a frequency-changing signal, the frequency-changing signal is fed back to the exclusive-or gate circuit 33, the frequency of the frequency-changing signal is different from the frequency of the input to the exclusive-or gate circuit 33 from the excitation source circuit 31, and the exclusive-or gate circuit 33 changes with the change of the input. When moisture exists in the soil, the xor gate circuit 33 outputs a signal with a variable high and low level, and outputs a stable direct current voltage signal to the controller 1 after filtering, so that the measurement of the soil humidity is realized.
Further, the first operational amplifier circuit 23 includes a first operational amplifier 231 connected to the filter circuit 22, the first operational amplifier 231 is connected to the second operational amplifier circuit 24,
the second operational amplifier circuit 24 includes a second operational amplifier 241 and a third operational amplifier 242 sequentially connected to the first operational amplifier 231, the second operational amplifier 241 is further connected to the conductivity measuring probe 27, and the third operational amplifier 242 is connected to the rectifying circuit 25.
Further, the rectifying circuit 25 includes a rectifying diode 251 connected to the third operational amplifier 242, the rectifying diode 251 is connected to the signal conditioning circuit 26,
the signal conditioning circuit 26 includes a fourth operational amplifier 261 connected to the rectifying diode 251, and the fourth operational amplifier 261 is connected to the controller 1.
Further, the filter circuit 22 includes a first resistor 221 and a first capacitor 222 sequentially connected to the conductivity measurement signal input terminal 21, the first capacitor 222 is connected to the inverting input terminal of the first operational amplifier 231, the non-inverting input terminal of the first operational amplifier 231 is connected to ground, the output terminal of the first operational amplifier 231 is connected to the non-inverting input terminal of the second operational amplifier 241,
the inverting input of the second operational amplifier 241 is connected to the conductivity measurement probe 27, the output of the second operational amplifier 241 is connected to the non-inverting input of the third operational amplifier 242,
the inverting input terminal of the third operational amplifier 242 is connected to ground, the output terminal of the third operational amplifier 242 is connected to the anode of the rectifying diode 251, the cathode of the rectifying diode 251 is connected to the non-inverting input terminal of the fourth operational amplifier 261, the inverting input terminal of the fourth operational amplifier 261 is connected to ground, and the output terminal of the fourth operational amplifier 261 is connected to the controller 1.
The utility model provides a sinusoidal signal of controller 1 output, first resistance 221 in filter circuit 22, under the low pass filtering of first electric capacity 222, become positive negative alternating current signal through blocking direct coupling electric capacity, it puts to carry out fortune again through first operational amplifier 231, later in proper order through second operational amplifier 241, the fortune of third operational amplifier 242 is put, the change of the conductivity impedance of soil influences the output signal of third operational amplifier 242, output signal changes along with the change of soil conductivity, the alternating current signal rectification that rethread rectifier diode 251 will pass through after measuring soil conductivity becomes the pulsation half-wave signal. The fourth operational amplifier 261 adjusts the pulsating half-wave signal so as to adjust the signal to a signal suitable for the controller 1 to acquire, thereby realizing the measurement of the soil conductivity.
Further, the excitation source circuit 31 includes a voltage controlled oscillator 311 connected to the controller 1, the voltage controlled oscillator 311 is connected to the humidity measuring probe 32,
the exclusive-or gate 33 includes an exclusive-or gate logic chip 331 connected to both the voltage-controlled oscillator 311 and the humidity measurement probe 32, and the exclusive-or gate logic chip 331 is connected to the controller 1.
The utility model provides a voltage-controlled oscillator 311 produces high frequency signal as the excitation source at the during operation, and the dielectric constant of soil changes along with the change of moisture, and the frequency of excitation source transmission forms the signal of frequency change after advancing resistance, electric capacity and soil, and this signal feedback is to exclusive-or gate logic chip 331, and this signal is different with the frequency that the excitation source input exclusive-or gate logic chip 331, leads to exclusive-or gate logic chip 331 to change along with the change of input. When moisture exists in soil, the XOR gate logic chip 331 outputs signals with high and low level changes, a first-order low-pass filter circuit is connected behind the XOR gate logic chip 331, and because the frequency is high, stable direct-current voltage signals can be output to the controller 1, and the system can work stably.
Further, the controller 1 is further connected with a power module 5, the power module 5 comprises a voltage input end 51, the voltage input end 51 is connected with a first voltage conversion circuit 52 and a second voltage conversion circuit 53 in sequence, the second voltage conversion circuit 53 is connected with a third voltage conversion circuit 54 and a fourth voltage conversion circuit 55, the first voltage conversion circuit 52 is further connected with a polarity inversion power converter 56,
the first voltage conversion circuit 52 and the polarity inversion power converter 56 are connected to the first operational amplifier 231,
the second voltage conversion circuit 53 is connected to the controller 1,
the third voltage conversion circuit 54 is connected with the controller 1, the signal conditioning circuit 26 and the temperature measurement module 4,
the fourth voltage conversion circuit 55 is connected to the excitation source circuit 31.
The utility model provides a controller 1 is connected with power module 5, and power module 5 includes voltage input part 51, and the voltage that voltage input part 51 was inputed carries out voltage conversion through first voltage conversion circuit 52, second voltage conversion circuit 53, third voltage conversion circuit 54, fourth voltage conversion circuit 55, thereby converts into different voltage value and can stabilize the power supply for each module in the system to guarantee the steady operation of system.
Further, the temperature measuring module 4 includes a second resistor 41 and an NTC thermistor 42 sequentially connected to the third voltage converting circuit 54, and the NTC thermistor 42 is connected to the controller 1.
Further, the controller 1 is also connected with a communication module 6, the communication module 6 comprises a transceiver 61 connected with the controller 1, and the transceiver 61 is connected with a control terminal 7 for remote control.
The utility model provides a temperature measurement module 4 adopts NTC thermistor 42 to gather the temperature, and the temperature risees, and thermistor value reduces, and the temperature reduces, and thermistor value risees, adopts second resistance 41 and NTC thermistor 42 to establish ties again, according to the magnitude of voltage of partial pressure, reachs soil temperature and passes to controller 1, realizes the measurement to soil temperature.
Further, the specific model of the controller 1 is STM32F100C8T 6; the specific models of the first operational amplifier 231, the second operational amplifier 241, the third operational amplifier 242 and the fourth operational amplifier 261 are all LM 224; the specific model of the voltage-controlled oscillator 311 is LTC 6905-100; the specific model of the exclusive-or gate logic chip 331 is 74LVC1G86 GW; the specific model of the polarity reversing power converter 56 is ICL 7660; the specific model of the transceiver 61 is SN65HVD 12.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A soil temperature and humidity and conductivity measurement control system is characterized by comprising a controller (1), wherein the controller (1) is connected with a conductivity measurement module (2), a humidity measurement module (3) and a temperature measurement module (4),
the conductivity measurement module (2) comprises a conductivity measurement signal input end (21), a filter circuit (22), a first operational amplifier circuit (23), a second operational amplifier circuit (24), a rectifier circuit (25) and a signal regulating circuit (26) which are sequentially connected with the controller (1), the second operational amplifier circuit (24) is connected with a conductivity measurement probe (27), and the signal regulating circuit (26) is connected with the controller (1),
the humidity measurement module (3) comprises an excitation source circuit (31) and a humidity measurement probe (32), the excitation source circuit (31) and the humidity measurement probe (32) are connected with the controller (1), the excitation source circuit (31) and the humidity measurement probe (32) are connected with an exclusive-or gate circuit (33), and the exclusive-or gate circuit (33) is connected with the controller (1).
2. The soil humiture and conductivity measurement control system according to claim 1, wherein the first operational amplifier circuit (23) comprises a first operational amplifier (231) connected to the filter circuit (22), the first operational amplifier (231) being connected to the second operational amplifier circuit (24),
the second operational amplifier circuit (24) comprises a second operational amplifier (241) and a third operational amplifier (242) which are sequentially connected with the first operational amplifier (231), the second operational amplifier (241) is further connected with the conductivity measuring probe (27), and the third operational amplifier (242) is connected with the rectifying circuit (25).
3. A soil humiture and conductivity measurement control system according to claim 2, wherein said rectifying circuit (25) includes a rectifying diode (251) connected to said third operational amplifier (242), said rectifying diode (251) being connected to said signal conditioning circuit (26),
the signal conditioning circuit (26) comprises a fourth operational amplifier (261) connected to the rectifier diode (251), the fourth operational amplifier (261) being connected to the controller (1).
4. A soil temperature and humidity and conductivity measurement control system as claimed in claim 3, wherein said filter circuit (22) comprises a first resistor (221) and a first capacitor (222) connected in sequence with said conductivity measurement signal input terminal (21), said first capacitor (222) is connected with the inverting input terminal of said first operational amplifier (231), the non-inverting input terminal of said first operational amplifier (231) is connected with ground, the output terminal of said first operational amplifier (231) is connected with the non-inverting input terminal of said second operational amplifier (241),
the inverting input of the second operational amplifier (241) is connected to the conductivity measurement probe (27), the output of the second operational amplifier (241) is connected to the non-inverting input of the third operational amplifier (242),
the inverting input terminal of the third operational amplifier (242) is connected to ground, the output terminal of the third operational amplifier (242) is connected to the positive electrode of the rectifier diode (251), the negative electrode of the rectifier diode (251) is connected to the non-inverting input terminal of the fourth operational amplifier (261), the inverting input terminal of the fourth operational amplifier (261) is connected to ground, and the output terminal of the fourth operational amplifier (261) is connected to the controller (1).
5. A soil humiture and conductivity measurement control system according to claim 4, characterized in that, the excitation source circuit (31) includes a voltage controlled oscillator (311) connected with the controller (1), the voltage controlled oscillator (311) is connected with the humidity measurement probe (32),
the exclusive-OR gate circuit (33) comprises an exclusive-OR gate logic chip (331) connected with the voltage-controlled oscillator (311) and the humidity measuring probe (32), and the exclusive-OR gate logic chip (331) is connected with the controller (1).
6. The soil temperature, humidity and conductivity measurement control system according to claim 5, wherein the controller (1) is further connected with a power module (5), the power module (5) comprises a voltage input end (51), the voltage input end (51) is sequentially connected with a first voltage conversion circuit (52) and a second voltage conversion circuit (53), the second voltage conversion circuit (53) is connected with a third voltage conversion circuit (54) and a fourth voltage conversion circuit (55), the first voltage conversion circuit (52) is further connected with a polarity inversion power converter (56),
the first voltage conversion circuit (52) and the polarity inversion power converter (56) are both connected with the first operational amplifier (231),
the second voltage conversion circuit (53) is connected to the controller (1),
the third voltage conversion circuit (54) is connected with the controller (1), the signal conditioning circuit (26) and the temperature measurement module (4),
the fourth voltage conversion circuit (55) is connected to the excitation source circuit (31).
7. The system for measuring and controlling the temperature and the humidity of the soil and the electrical conductivity of claim 6, wherein the temperature measuring module (4) comprises a second resistor (41) and an NTC thermistor (42) which are sequentially connected with the third voltage converting circuit (54), and the NTC thermistor (42) is connected with the controller (1).
8. The soil temperature and humidity and conductivity measurement control system according to claim 7, wherein a communication module (6) is further connected to the controller (1), the communication module (6) comprises a transceiver (61) connected to the controller (1), and the transceiver (61) is connected to a control terminal (7) for remote control.
9. The soil temperature, humidity and conductivity measurement control system according to claim 8, wherein the specific model of the controller (1) is STM32F100C8T 6; the specific models of the first operational amplifier (231), the second operational amplifier (241), the third operational amplifier (242) and the fourth operational amplifier (261) are LM 224; the specific model of the voltage-controlled oscillator (311) is LTC 6905-100; the specific model of the exclusive-OR gate logic chip (331) is 74LVC1G86 GW; the specific model of the polarity reversal power converter (56) is ICL 7660; the specific model of the transceiver (61) is SN65HVD 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921085544.7U CN210376215U (en) | 2019-07-12 | 2019-07-12 | Soil humiture and conductivity measurement control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921085544.7U CN210376215U (en) | 2019-07-12 | 2019-07-12 | Soil humiture and conductivity measurement control system |
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| CN210376215U true CN210376215U (en) | 2020-04-21 |
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| CN201921085544.7U Active CN210376215U (en) | 2019-07-12 | 2019-07-12 | Soil humiture and conductivity measurement control system |
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| CN (1) | CN210376215U (en) |
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