CN204855436U - Soil moisture detection circuitry - Google Patents
Soil moisture detection circuitry Download PDFInfo
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- CN204855436U CN204855436U CN201520333975.6U CN201520333975U CN204855436U CN 204855436 U CN204855436 U CN 204855436U CN 201520333975 U CN201520333975 U CN 201520333975U CN 204855436 U CN204855436 U CN 204855436U
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- soil moisture
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- soil
- voltage
- testing circuit
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Abstract
The utility model is applicable to the field of electronic technology, a soil moisture detection circuitry is provided, including detection module, comparison module and the display module that connects gradually, the display module includes the LED lamp of three different colours, the display module is according to the LED lamp of the different colours of signal display of relatively module output. The utility model provides a soil moisture detection circuitry can realize the detection and the demonstration of different soil moisture states.
Description
Technical field
The utility model belongs to electronic technology field, particularly relates to a kind of soil moisture testing circuit.
Background technology
The temperature of soil is most important for the growth of crop, if can not reach the temperature required for crop, the crop yield of growth place and quality all can be affected.Soil moisture is too low can form soil drought, and the photosynthesis of plant just can not normally carry out, and the yield and quality of crop all can reduce, and serious lack of water will cause crop atrophy and death.The soil moisture is too high can worsen soil courage again, affects the activity of soil microorganism, the vital movements such as the breathing of crop root, growth is hindered, thus affects the normal growth of crop field upper part.
Routine can only show a kind of moisture condition to the detection of soil moisture, causes the judgement of plantation people to soil moisture to be inaccurate.
Utility model content
The object of the utility model embodiment is to provide a kind of soil moisture testing circuit, is intended to solve the problem that existing Humidity Detection can only show a kind of moisture condition.
The utility model embodiment is achieved in that a kind of soil moisture testing circuit, comprises the detection module, comparison module and the display module that connect successively; Described display module comprises the LED of three different colours, the LED of the Signal aspects different colours that described display module exports according to comparison module.
Further, described detection module comprises signal probe, grounded probe, the first resistance R5, the first electric capacity C1, described signal probe one end is for connecting soil, the other end connects the first resistance R5 and the first electric capacity C1, the other end of described first resistance R5 connects input voltage, the other end ground connection of described first electric capacity C1, described grounded probe one end for connecting soil, other end ground connection.
Further, described comparison module comprises three voltage comparators, and the dividing potential drop resistance of each voltage comparator is different.
Further, described comparison module also comprises three triodes, connects described three voltage comparators respectively, the output of described voltage comparator is oppositely inputted display module afterwards.
Further, also comprise voltage follow module, be connected between described detection module and comparison module.
Electric resistance of soil value change transitions is the change of voltage by soil moisture testing circuit of the present utility model, voltage detecting is carried out again by voltage comparator, drive the light on and off of the LED of red, green, blue three kinds of colors finally by LED drive circuit, LED presents the difference that different colors represents moisture condition in soil.Achieve detection and the display of different soil moisture state.
Accompanying drawing explanation
Fig. 1 is the structural drawing of the soil moisture testing circuit that the utility model embodiment one provides;
Fig. 2 is the circuit diagram of detection module in the soil moisture testing circuit that provides of the utility model embodiment one;
Fig. 3 is the circuit diagram of comparison module in the soil moisture testing circuit that provides of the utility model embodiment one;
Fig. 4 is the circuit diagram of display module in the soil moisture testing circuit that provides of the utility model embodiment one;
Fig. 5 is another circuit diagram of the soil moisture testing circuit that the utility model embodiment one provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the circuit that the utility model embodiment one provides comprises the detection module 10, comparison module 20 and the display module 30 that connect successively; Display module 30 comprises LED and the LED drive unit of three different colours, the LED of the Signal aspects different colours that display module 30 exports according to comparison module 20.
Detection module 10 detects the humidity of soil, because when soil moisture content changes, conductance also changes, the essence that conductance changes is the change of electric resistance of soil value, the electric resistance of soil value detected is converted into voltage signal by detection module 10, export comparison module 20 to, voltage detecting is carried out by comparison module, finally driven the light on and off of the LED of red, green, blue three kinds of colors by the LED drive unit of display module 30 according to testing result, LED presents the difference that different colors represents moisture condition in soil.
As shown in Figure 2, detection module 10 comprises signal probe IN, grounded probe GND, the first resistance R5, the first electric capacity C1, signal probe IN one end is for connecting soil, the other end connects the first resistance R5 and the first electric capacity C1, the other end of the first resistance R5 connects input voltage VCC, the other end ground connection of the first electric capacity C1, grounded probe one end for connecting soil, other end ground connection.
As shown in Figure 3, comparison module 20 comprises three voltage comparators U1A, U2A, U2B, the dividing potential drop resistance of each voltage comparator is different, resistance R2, R3, R6, R10, R12, R13 are reference voltage bleeder circuit, each voltage comparator is all designed with two reference voltage bleeder circuits, and the resistance of these three groups of reference voltage bleeder circuits is different, export so have different results after over-voltage comparator.With the bleeder circuit of reference shown in Fig. 3 for example (can arrange the resistance with reference to bleeder circuit in actual design as required), resistance R2, R3, R6, R10, R12, R13 are respectively 50K, 100K, 100K, 100K, 100K, 50K.The signal that signal probe IN exports exports three digital signal G, B, R respectively after over-voltage comparator U1A, U2A, U2B process.Comparison module 20 also comprises triode Q1, Q2, Q3, oppositely uses for giving LED driver element.
As shown in Figure 4, comparison module 20 by digital signal G, B, R oppositely after export display module 30 to, driving LED lamp D1, D2, D3, LED D1, D2, D3 are respectively three kinds of color different colours.The signal exported has two states high level (representing with 1), low level (representing with 0), when the driest moisture of soil moisture is low, the incoming level of LED D1, D2, D3 is 0,0,0, at this moment bright while of LED D1, D2, D3, externally demonstrate three kinds of blend of colors colors.When soil moisture is suitable, the incoming level of LED D1, D2, D3 is 1,0,0, at this moment only have LED D2, D3 bright, externally demonstrate the blend color of two kinds of colors (as blue, red), when soil moisture moisture is sufficient, the incoming level of LED D1, D2, D3 is 1,1,0, at this moment only have LED D3 bright.
As shown in Figure 5, the utility model also can comprise a voltage follow module 40, be connected between detection module 10 and comparison module 20, the voltage signal that detection module 10 detects is input in voltage follow module 40, voltage follow module 40 can improve the impedance of input circuit, avoid metering circuit on the impact of circuit-under-test, improve accuracy of detection.
Electric resistance of soil value change transitions is the change of voltage by soil moisture testing circuit of the present utility model, voltage detecting is carried out again by voltage comparator, drive the light on and off of the LED of red, green, blue three kinds of colors finally by LED drive circuit, LED presents the difference that different colors represents moisture condition in soil.Achieve detection and the display of different soil moisture state.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (5)
1. a soil moisture testing circuit, is characterized in that, comprises the detection module, comparison module and the display module that connect successively; Described display module comprises the LED of three different colours, the LED of the Signal aspects different colours that described display module exports according to comparison module.
2. soil moisture testing circuit as claimed in claim 1, it is characterized in that, described detection module comprises signal probe, grounded probe, the first resistance R5, the first electric capacity C1, described signal probe one end is for connecting soil, the other end connects the first resistance R5 and the first electric capacity C1, and the other end of described first resistance R5 connects input voltage, the other end ground connection of described first electric capacity C1, described grounded probe one end for connecting soil, other end ground connection.
3. soil moisture testing circuit as claimed in claim 1 or 2, it is characterized in that, described comparison module comprises three voltage comparators, and the dividing potential drop resistance of each voltage comparator is different.
4. soil moisture testing circuit as claimed in claim 3, it is characterized in that, described comparison module also comprises three triodes, connects described three voltage comparators respectively, the output of described voltage comparator is oppositely inputted display module afterwards.
5. soil moisture testing circuit as claimed in claim 1 or 2, is characterized in that, also comprise voltage follow module, be connected between described detection module and comparison module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520333975.6U CN204855436U (en) | 2015-05-20 | 2015-05-20 | Soil moisture detection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520333975.6U CN204855436U (en) | 2015-05-20 | 2015-05-20 | Soil moisture detection circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204855436U true CN204855436U (en) | 2015-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520333975.6U Expired - Fee Related CN204855436U (en) | 2015-05-20 | 2015-05-20 | Soil moisture detection circuitry |
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| CN (1) | CN204855436U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106332352A (en) * | 2016-08-31 | 2017-01-11 | 江苏开元太阳能照明有限公司 | Solar garden lamp control system based on single-chip microcomputer |
-
2015
- 2015-05-20 CN CN201520333975.6U patent/CN204855436U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106332352A (en) * | 2016-08-31 | 2017-01-11 | 江苏开元太阳能照明有限公司 | Solar garden lamp control system based on single-chip microcomputer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20180520 |
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| CF01 | Termination of patent right due to non-payment of annual fee |