CN201477059U - Digital soil moisture temperature sensor - Google Patents
Digital soil moisture temperature sensor Download PDFInfo
- Publication number
- CN201477059U CN201477059U CN2009201633877U CN200920163387U CN201477059U CN 201477059 U CN201477059 U CN 201477059U CN 2009201633877 U CN2009201633877 U CN 2009201633877U CN 200920163387 U CN200920163387 U CN 200920163387U CN 201477059 U CN201477059 U CN 201477059U
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- soil moisture
- chip microcomputer
- temperature sensor
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Abstract
The utility model relates to a digital soil moisture temperature sensor comprising a shell, a circuit board, a probe and a connecting line, wherein the shell is internally sheathed with the circuit board, the left end of the shell is connected with the connecting line and the right end thereof is fixed with the probe which is internally provided with a thermistor; the circuit board is provided with a crystal oscillator which is connected with a measuring circuit by a two-stage amplifier, and the measuring circuit is connected with the probe; the circuit board is also provided with a power supply module, a single chip microcomputer and an digital-to-analog converter which is connected with the thermistor and the soil moisture measuring circuit; and the digital-to-analog converter is connected on the single chip microcomputer which is provided with an external port for external communication, and the communication port adopts a single bus mode. The digital soil moisture temperature sensor has the benefit that the structural design is reasonable and simple, the use is convenient, the measuring speed is fast, the accuracy is high, the stability is good, the volume is small and the appearance is exquisite; and the single bus transmission is adopted and has far transmission distance and no measuring signal loss, so that the digital soil moisture temperature sensor is beneficial to guaranteeing measuring accuracy.
Description
Technical field
The utility model relates to a kind of soil moisture, temperature sensor, especially a kind of digitizing soil moisture temperature sensor.
Background technology
Existing soil moisture, temperature measurement equipment are mainly on the market: independent simulation output (soil moisture) humidity sensor and independent PT1000 temperature sensor, simulation output (soil moisture) humidity sensor is by independent signal wire the simulating signal of measuring to be transmitted, and the simulating signal that passes out is handled obtaining the soil moisture value by the collecting device of rear end; The PT1000 temperature sensor also is by independent signal wire the simulating signal of measuring to be transmitted, and the analog passband signal that the passes out collecting device of end later handled obtains soil moisture value, and there is following shortcoming in use in this equipment:
1); Each moisture, temperature measurement equipment all need an independent probe to go deep in the soil, cause same point to measure and insert two independent sensors, cause that soil is loosening, the original position structure of too much destruction soil;
2); The simulating signal transmission of each measuring probe needs independently data line, is unfavorable for the use of long distance, multiple probe measurement (engineering or system or scheme) equipment;
3); Simulating signal has the loss of signal in transmission, influence measurement result;
4); Soil moisture and temperature signal nonlinearity erron are big, need do curve fitting by the collecting device of rear end;
5); Form the measuring system complicated integral structure, when using in a large number, the cable of use is many, the waste cable, and the cost height uses inconvenient.
6) soil moisture measurement signal source instability is subject to the influence of soil water content and environment temperature.
The utility model content
The purpose of this utility model provides a kind of digitizing soil moisture temperature sensor, has overcome the said goods complicated integral structure, the deficiency that integrated cost is high and use is inconvenient.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of digitizing soil moisture temperature sensor, comprise, shell, circuit board, probe and connecting line, be nested with circuit board in the described shell, the shell left end connects connecting line, connecting line connecting circuit plate, shell right-hand member stationary probe is provided with thermistor in the probe, thermistor in probe and the probe is connected with circuit board, can the while measured soil moisture and the soil moisture by probe; One crystal oscillator is set on the described circuit board, crystal oscillator connects metering circuit by two amplifiers, the described amplifier of connecting with crystal oscillator also is connected an agc circuit, and the amplifier of connecting with metering circuit is the emitter-base bandgap grading output amplifier, and emitter-base bandgap grading output amplifier and agc circuit are connected; Described metering circuit connects the probe of measuring humidity, the constant current source on the thermistor connecting circuit plate in the probe; Power module, single-chip microcomputer and digital to analog converter also are set on the described circuit board, and digital to analog converter connects thermistor, and digital to analog converter is connected the metering circuit that is connected on the probe by dc amplification circuit; Digital to analog converter is connected on the single-chip microcomputer, and described single-chip microcomputer is provided with the outside port that carries out PERCOM peripheral communication, and outside port adopts SDI-12 consensus standard interface, and the outside port of the communication interface of unibus connects anti-thunder and lightning circuit.
On the described single-chip microcomputer setting circuit board in the enclosure, single-chip microcomputer is PIC18F25K20, and single-chip microcomputer is by IIC interface linking number weighted-voltage D/A converter, and single-chip microcomputer connects agc circuit; Also write data processing module and power initiation module in the described single-chip microcomputer; Also be provided with the humidity matched curve of two common type soil and one in the described single-chip microcomputer and make particular curve by oneself.
Described thermistor is PT1000.
The beneficial effect of digitizing soil moisture temperature sensor described in the utility model is: humidity, temperature survey combine, and avoid many probes to use together, cause soil disturbance; Reasonable in design, simple, easy to use, measuring speed is fast, precision is high, good stability, little, the exquisite appearance of volume; The employing digital information transmits, and no measuring-signal transmission loss helps ensureing measuring accuracy; Adopt the transmission of unibus hardware, avoid the not enough problem of passage, the use of saving cable reduces input cost.
Description of drawings
Fig. 1 is the structural representation of the described digitizing soil moisture of the utility model embodiment temperature sensor;
Fig. 2 is the schematic diagram of the described digitizing soil moisture of the utility model embodiment temperature sensor;
Fig. 3 is the partial circuit diagram of the described digitizing soil moisture of the utility model embodiment temperature sensor.
Among the figure:
1, shell; 2, circuit board; 3, probe; 4, connecting line; 5, thermistor; 6, single-chip microcomputer; 7, power module; 8, digital to analog converter; 9, amplifier; 10, data processing module; 11, power initiation module; 12, crystal oscillator; 13, AGC automatic gain control/compensation; 14, constant current source; 15, outside port; 16, metering circuit; 17, dc amplification circuit; 18, anti-thunder and lightning circuit.
Embodiment
As illustrated in fig. 1 and 2, the described digitizing soil moisture of the utility model embodiment temperature sensor, comprise connecting line 4, shell 1, circuit board 2, probe 3, be nested with circuit board 2 in the described shell 1, shell 1 left end connects connecting line 4, connecting line 4 connecting circuit plates 2, shell 1 right-hand member is fixed four probes 3, thermistor 5 is set in the probe 3, thermistor 5 in probe 3 and the probe 3 is connected with circuit board 2, measure humidity by probe 3, thermistor 5 is measured temperature and measurement result is carried out adopting connecting line 4 to transmit after data-switching, the processing; One crystal oscillator 12 is set on the described circuit board 2, crystal oscillator 12 connects metering circuit 16 by two amplifiers 9, the described amplifier of connecting with crystal oscillator 12 9 also is connected an agc circuit 13, the amplifier of connecting with metering circuit 16 9 is the emitter-base bandgap grading output amplifier, emitter-base bandgap grading output amplifier and agc circuit 13 are connected, the stability that the sine wave that crystal oscillator 12 is sent by two amplifiers 9 amplifies and work in coordination with by agc circuit 13 the enhancing sine wave, thereby avoided because the signal source changes in amplitude that different moistures causes improves the precision of measuring; Described metering circuit 16 connects the probe 3 of measuring humidity, the constant current source 14 on the thermistor 5 place in circuit plates 2 in the probe 3; Single-chip microcomputer 6 and digital to analog converter 8 also are set on the described circuit board 2, digital to analog converter 8 inserts the thermistor 5 that embodies temperature gap, digital to analog converter 8 is connected the metering circuit 16 that is connected on the probe 3 by dc amplification circuit 17, and the analog signal conversion of thermistor 5 or probe 3 being measured by digital to analog converter 8 becomes data; Digital to analog converter 8 is connected on the single-chip microcomputer 6, digital-to-analogue converter 8 converts measure analog signals to and is sent to single-chip microcomputer 6 behind the data message and carries out data processing, and the connecting line 4 that the outside port 15 that utilizes single-chip microcomputer 6 connects transmits, the outside port 15 of the communication interface of described unibus inserts an anti-thunder and lightning circuit 18, makes this circuit possess lightning protection electric work energy by anti-thunder and lightning circuit 18.
One power module 7 also is set on the described circuit board 2, provides power supply for entire circuit by single-chip microcomputer 6 control power modules 7.
Described single-chip microcomputer 6 is arranged on the circuit board 2 in the shell 1, can directly temperature, humidity sensor be set and other settings be adjusted and setting value, makes that the digital signal of connecting line 4 outputs is regular, easy to control, and comparative etc. is arranged; Described single-chip microcomputer 6 is PIC18F25K20, and single-chip microcomputer 6 is by IIC interface linking number weighted-voltage D/A converter 8, and single-chip microcomputer 6 connects agc circuit 13; Also write a data processing module 10 in the described single-chip microcomputer 6, write a power initiation module 11 in the single-chip microcomputer 6, power initiation program 11 controllable power 7 are to digital to analog converter 8 and constant current source 14 power supplies; Also be provided with the humidity matched curve of two common type soil in the described single-chip microcomputer 6, and can set a particular curve, so that improve measuring accuracy according to the soil characteristic that client oneself measures.
The outside port 15 of described single-chip microcomputer 6 adopts SDI-12 consensus standard interface.
Described thermistor 5 is PT1000, but is-20～80 ℃ by the temperature range of PT1000 measured soil.
Described soil moisture measurable range is 0-100%.
Described agc circuit 13 is automatic gain control/compensation, and its effect is when signal source is strong, makes its Gain Automatic reduction; When signal is more weak, makes its Gain Automatic increasing again, thereby guaranteed that the homogeneity of strong and weak signals improves the stability of signal source, has guaranteed the precision of soil moisture measurement.
The described digitizing soil moisture of the utility model embodiment temperature sensor, in use, described adc circuit 13 is 16bit, the built-in 1-8 beneficial amplifier that doubles, the input of two-way difference, the one tunnel as soil moisture measurement usefulness, and one the tunnel measures as the soil moisture and to use.Finish the conversion of simulating signal, communicate, and give single-chip microcomputer 6 result transmission of conversion by IIC interface and single-chip microcomputer 6 to digital signal.
Its principle is: under the normal temperature state, the specific inductive capacity of water is about 80, and the specific inductive capacity of solid phase of soil material is about 3～5, and the specific inductive capacity of air is 1, influencing soil dielectric constant mainly is water percentage, and the specific inductive capacity in the soil body mainly depends on volumetric water content of soil.
Soil moisture measurement is: adopts crystal oscillator 12 to produce high-frequency signals, and is transferred on the parallel metal probe 3, and the signal of generation and the signal that returns stack, the amplitude by measuring-signal comes the measured soil moisture.Ionic conductivity in 3 pairs of soil of probe is insensitive, specific inductive capacity by probe 3 measured soil, because the specific inductive capacity of water is approximately 80, the specific inductive capacity of soil matrix is generally 3-5, and the specific inductive capacity of air is 1, in effective measurement volumes scope, the specific inductive capacity of soil depends primarily on the content of moisture in the soil like this.
Produce the 100MHZ sine wave by crystal oscillator 12, amplify through signal amplifier 9, and carry out automatic gain by the agc circuit 13 that signal amplifier 9 connects and control, signal amplifies through emitter-base bandgap grading output amplifier (amplifier 9) after agc circuit 13 regulation and control are amplified again, and send to probe 3 by metering circuit 16, metering circuit 16 compares signal amplitude and the difference of reference source amplitude, i.e. the soil moisture specific inductive capacity of probe 3 simultaneously.
The signal one tunnel of emitter-base bandgap grading output amplifier 2 outputs is transferred to agc circuit 13, and purpose is by agc circuit control signal amplifier 9, makes metering circuit 16 can obtain a signal that amplitude is highly stable; Simultaneously, another road is transferred to reference source and probe 3; And the signal of the reaction soil water content that produces through dc amplification circuit 17 measurement by magnification circuit 16, signal output 0-2000mV is corresponding to soil moisture content 0-100%.
After single-chip microcomputer 6 received acquisition instructions, single-chip microcomputer 6 was at first put high level by the RB mouth and is started power supply, and put high level directly to digital to analog converter 8 and constant current source 14 power supplies by the RC5 mouth.After power supply is stablized 1 second, start digital to analog converter 8 and measure, measuring finishes closes the corresponding power supply in back to reduce power consumption.
Above-described embodiment, the utility model embodiment a kind of more preferably just, the common variation that those skilled in the art carries out in the technical solutions of the utility model scope and replacing all should be included in the protection domain of the present utility model.
Claims (6)
1. digitizing soil moisture temperature sensor, comprise shell, circuit board, probe and connecting line, be nested with circuit board in the described shell, the shell left end connects connecting line, connecting line connecting circuit plate, shell right-hand member stationary probe is characterized in that: thermistor is set in the probe, and the thermistor in probe and the probe is connected with circuit board; Its circuit structure is: a crystal oscillator is set on the circuit board, crystal oscillator connects metering circuit by two amplifiers, the signal amplifier of connecting with metering circuit is the emitter-base bandgap grading output amplifier, the constant current source on the thermistor connecting circuit plate in the described metering circuit linking probe, probe; Power module, single-chip microcomputer and digital to analog converter also are set on the described circuit board, and digital to analog converter connects thermistor, and digital to analog converter is connected the metering circuit that is connected on the probe by dc amplification circuit; Described digital to analog converter is connected on the single-chip microcomputer, and single-chip microcomputer is provided with the outside port that carries out PERCOM peripheral communication, and outside port adopts single bus interface.
2. digitizing soil moisture temperature sensor according to claim 1 is characterized in that: single-chip microcomputer is PIC18F25K20, and single-chip microcomputer is by IIC interface linking number weighted-voltage D/A converter; Also write data processing module and power initiation module in the described single-chip microcomputer.
3. digitizing soil moisture temperature sensor according to claim 2 is characterized in that: also be provided with the humidity matched curve of two common type soil and one in the single-chip microcomputer and make particular curve by oneself.
4. digitizing soil moisture temperature sensor according to claim 1 is characterized in that: the outside port of the communication interface of unibus connects an anti-thunder and lightning circuit.
5. digitizing soil moisture temperature sensor according to claim 1, it is characterized in that: the communication protocol of outside port has adopted the SDI-12 agreement.
6. digitizing soil moisture temperature sensor according to claim 1 is characterized in that: be provided with agc circuit in the soil moisture measurement circuit of sensor, described agc circuit is connected on the amplifier of connecting with crystal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201633877U CN201477059U (en) | 2009-07-09 | 2009-07-09 | Digital soil moisture temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201633877U CN201477059U (en) | 2009-07-09 | 2009-07-09 | Digital soil moisture temperature sensor |
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| Publication Number | Publication Date |
|---|---|
| CN201477059U true CN201477059U (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201633877U Expired - Fee Related CN201477059U (en) | 2009-07-09 | 2009-07-09 | Digital soil moisture temperature sensor |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916504A (en) * | 2010-07-16 | 2010-12-15 | 天津市国土资源和房屋管理局 | Distributed tandem earth-layer fine temperature measurement and wire transmission and acquisition system |
| CN102494803A (en) * | 2011-12-02 | 2012-06-13 | 中国科学院东北地理与农业生态研究所 | Electronic digital-display speed-reading geothermometer |
| CN102650607A (en) * | 2012-04-28 | 2012-08-29 | 中国科学院地理科学与资源研究所 | Method and device for determining moisture content of aerobic fermentation material |
| CN102735888A (en) * | 2011-04-13 | 2012-10-17 | 致茂电子(苏州)有限公司 | Probe structure and probe manufacturing method |
| CN103308566A (en) * | 2013-06-25 | 2013-09-18 | 华北电力大学 | Coal-water integrated sensor |
| CN106033085A (en) * | 2015-04-15 | 2016-10-19 | 中国农业科学院农业信息研究所 | Soil salinity and alkalinity positioning and monitoring device |
| CN106953631A (en) * | 2016-01-06 | 2017-07-14 | 精工爱普生株式会社 | Circuit arrangement, oscillator, electronic equipment and moving body |
| CN108051485A (en) * | 2017-12-14 | 2018-05-18 | 北京雨根科技有限公司 | Soil moisture measurement method and soil moisture sensor |
| US10890548B2 (en) | 2017-11-23 | 2021-01-12 | Industrial Technology Research Institute | Resistive gas sensor and gas sensing method therefor |
-
2009
- 2009-07-09 CN CN2009201633877U patent/CN201477059U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916504A (en) * | 2010-07-16 | 2010-12-15 | 天津市国土资源和房屋管理局 | Distributed tandem earth-layer fine temperature measurement and wire transmission and acquisition system |
| CN101916504B (en) * | 2010-07-16 | 2012-11-14 | 天津市国土资源和房屋管理局 | Distributed tandem earth-layer fine temperature measurement and wire transmission and acquisition system |
| CN102735888A (en) * | 2011-04-13 | 2012-10-17 | 致茂电子(苏州)有限公司 | Probe structure and probe manufacturing method |
| CN102494803A (en) * | 2011-12-02 | 2012-06-13 | 中国科学院东北地理与农业生态研究所 | Electronic digital-display speed-reading geothermometer |
| CN102650607A (en) * | 2012-04-28 | 2012-08-29 | 中国科学院地理科学与资源研究所 | Method and device for determining moisture content of aerobic fermentation material |
| CN102650607B (en) * | 2012-04-28 | 2015-10-07 | 中国科学院地理科学与资源研究所 | A kind of method and apparatus measuring moisture content of aerobic fermentation material |
| CN103308566A (en) * | 2013-06-25 | 2013-09-18 | 华北电力大学 | Coal-water integrated sensor |
| CN106033085A (en) * | 2015-04-15 | 2016-10-19 | 中国农业科学院农业信息研究所 | Soil salinity and alkalinity positioning and monitoring device |
| CN106953631A (en) * | 2016-01-06 | 2017-07-14 | 精工爱普生株式会社 | Circuit arrangement, oscillator, electronic equipment and moving body |
| US10890548B2 (en) | 2017-11-23 | 2021-01-12 | Industrial Technology Research Institute | Resistive gas sensor and gas sensing method therefor |
| CN108051485A (en) * | 2017-12-14 | 2018-05-18 | 北京雨根科技有限公司 | Soil moisture measurement method and soil moisture sensor |
| CN108051485B (en) * | 2017-12-14 | 2023-07-25 | 北京雨根科技有限公司 | Soil moisture measuring method and soil moisture sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20120709 |