CN207036751U - Soil moisture sensor - Google Patents
Soil moisture sensor Download PDFInfo
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- CN207036751U CN207036751U CN201720957936.2U CN201720957936U CN207036751U CN 207036751 U CN207036751 U CN 207036751U CN 201720957936 U CN201720957936 U CN 201720957936U CN 207036751 U CN207036751 U CN 207036751U
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Abstract
The utility model discloses a kind of soil moisture sensor, including the first housing being imbedded in soil and the second housing being placed in outside soil, first housing forward end is provided with two pieces of pole plates, is provided with constant-current source in first shell body, two pieces of pole plates electrically connect with constant-current source both positive and negative polarity respectively；Microprocessor, display driver circuit and power circuit are provided with the second shell body, the second housing tip is provided with display unit；Microprocessor is used to gather voltage between two-plate, and the resistance of soil is calculated according to the relation of voltage and electric current, and soil water content is calculated and by soil water content output display according to the relation of electric resistance of soil and soil moisture；Display unit is used to show soil water content；Display driver circuit is used to drive display unit to show；Power circuit is used to provide constant voltage for microprocessor and constant-current source.It is higher that this programme solves current soil moisture sensor cost, the problem of not being suitable in daily life measuring potting soil moisture.
Description
Technical field
It the utility model is related to determining soil moisture field, and in particular to a kind of soil moisture sensor.
Background technology
Usually need to water to potted plant in our life, when raising flowers, but in many families, watering is more
Be a kind of timing behavior（Pour how many daily）, empirical in other words behavior（What how others watered）, or even the family to having
For front yard, watering is to have remembered just watering once in a while.These modes for potted plant, all without science, be unfavorable for it is potted plant in
The growth of plant.
Under this background, we just contemplate is measured using sensor to soil moisture, is then tied according to measurement
Fruit determines irrigation amount again, to ensure the science of watering.But we are inquired about after pertinent literature, present soil moisture is found
Detection method of content has TDR (time domain reflectometry), FDR (frequency domain bounce technique) and SWR (standing wave ratio method), and wherein TDR and FDR are states
Outer patented technology, measurement accuracy is higher, but because process circuit complexity causes cost high, a TDR is up to tens thousand of
Dollar, a FDR is up to several thousand dollars；SWR soil moisture content sensors employ sophisticated signal source by measuring standing wave ratio
Method can make cost be reduced to 600 yuans.But based on the soil moisture sensor of the above method because cost is higher, it is uncomfortable
For being measured in daily life to potting soil moisture, therefore it is badly in need of a kind of low soil moisture sensing of cost at present
Device.
Utility model content
The utility model is intended to provide a kind of soil moisture sensor, with solve current soil moisture sensor cost compared with
Height, the problem of not being suitable in daily life measuring potting soil moisture.
Base case provided by the utility model is：Soil moisture sensor, including the first housing being imbedded in soil
And the second housing being placed in outside soil, first housing forward end are provided with two pieces of pole plates, constant-current source, institute are provided with first shell body
Two pieces of pole plates are stated to electrically connect with constant-current source both positive and negative polarity respectively；Be provided with the second shell body microprocessor, display driver circuit and
Power circuit, the second housing tip are provided with display unit；
Microprocessor is used to gather the voltage between two-plate, and the resistance of soil is calculated according to the relation of voltage and electric current,
Soil water content is calculated and by soil water content output display according to the relation of electric resistance of soil and soil moisture；
Display unit is used to show soil water content；
Display driver circuit is used to drive display unit to show；
Power circuit is used to provide constant voltage for microprocessor and constant-current source；
Constant-current source is used to provide constant electric current for two pieces of pole plates.
The operation principle of base case：First housing is imbedded in soil, and the second housing is placed in outside soil, wherein this programme
Using the resistance of electric current-voltage four-end method measurement soil, the both positive and negative polarity of the constant-current source in the first housing respectively with two blocks of pole plate electricity
Connect, there is electric current to flow through between two-plate, electrical potential difference certainly will be produced, by between microprocessor two pieces of pole plates of collection in the second housing
Voltage, and then calculate according to R=U/I the resistance of soil, microprocessor is according to the relation of electric resistance of soil and soil water content
P= F（R）, the content of the soil moisture currently measured is drawn, and containing for the soil moisture currently measured is shown by display unit
Amount.
The beneficial effect of base case is：Electric resistance of soil is obtained by two electrode plates being embedded in soil in this programme,
The content of current soil moisture is obtained according to the relation of soil water content, implementation process is simple, and cost is relatively low, is adapted to daily
The potted plant cultivation of life, wherein obtaining the less operand of microprocessor of method of resistance using four-end method, improve measurement
The accuracy of data.
Further, microprocessor uses STC12C5A60S2 single-chip microcomputers.Beneficial effect：STC12C5A60S2 single-chip microcomputers have
A/D translation functions, and arithmetic speed is fast, low in energy consumption, strong antijamming capability, and it is cheap.
Further, pole plate uses alumina plate.Beneficial effect：Because of alumina plate good weatherability, in the soil buried for a long time
It is not easy corrosion, oxidation and gets rusty, it is ensured that the accuracy of measurement data.
Further, the plate spacing of two pieces of pole plates is 5cm.Beneficial effect：The distance is optimum measurement distance.
Further, plate dimensions 5*10cm.Beneficial effect：Controlled while the quantity of electric charge needed for measurement accuracy is met
Cost is made.
Further, the second housing is attached on flowerpot using double faced adhesive tape gluing.Beneficial effect：Second housing passes through double faced adhesive tape glue
Paste on flowerpot, be easy to the placement of the second housing, also allow for observing the measured value that display unit is shown on the second housing.
Brief description of the drawings
Fig. 1 is the schematic front view of the utility model embodiment；
Fig. 2 is the theory diagram of the utility model embodiment；
Fig. 3 is the utility model embodiment and soil water content graph of a relation.
Embodiment
The utility model is described in further detail below by embodiment：
Reference in Figure of description includes：First housing 1, pole plate 11, constant-current source 12, the second housing 2, power supply electricity
Road 21, microprocessor 22, display driver circuit 23, display unit 24.
Embodiment is substantially as shown in Figure 1 and Figure 2：
Soil moisture sensor includes the first housing 1 being imbedded in soil and the second housing 2 being placed in outside soil, the
Two housings 2 are pasted on flowerpot by double faced adhesive tape, and double faced adhesive tape can use 3M double faced adhesive tapes, be easy to the placement of the second housing 2, also allow for
Observe the measured value that display unit 24 is shown on the second housing 2.The front end of first housing 1 is provided with two pieces of pole plates 11, in the first housing 1
Provided with constant-current source 12, two pieces of pole plates 11 electrically connect with the both positive and negative polarity of constant-current source 12 respectively；Be provided with second housing 2 microprocessor 22,
Display driver circuit 23 and power circuit 21, the top of the second housing 2 are provided with display unit 24；Microprocessor 22 is used to gather the two poles of the earth
Voltage between plate 11, the resistance of soil is calculated according to the relation of voltage and electric current, according to electric resistance of soil and the pass of soil moisture
System calculates soil water content and by soil water content output display；Display unit 24 is used to show soil water content；
Display driver circuit 23 is used to drive display unit 24 to show；Power circuit 21 is used to provide for microprocessor 22 and constant-current source 12
Constant voltage；Constant-current source 12 is used to provide constant electric current for two pieces of pole plates 11.
Pole plate 11 wherein in the present embodiment uses alumina plate, because of alumina plate good weatherability, is imbedded in soil for a long time
In be not easy corrosion, oxidation and to get rusty, it is ensured that the accuracy of measurement data, the size of pole plate 11 are 5*10cm, and plate spacing is 5cm,
Cost is also controlled while not only meeting the quantity of electric charge needed for measurement accuracy.Due to without the size of current to constant-current source 12
It is adjusted, therefore the constant-current source 12 of the present embodiment uses two NPN type triodes, utilizes the metastable be voltages of triode
As benchmark, current values are：I=Vbe/R, due to not using particular components, it can effectively reduce cost；Microprocessor 22 is adopted
With with A/D translation function STC12C5A60S2 single-chip microcomputers, its arithmetic speed is fast, low in energy consumption, strong antijamming capability, and price is just
Preferably.Display unit 24 uses common cathode charactron charactron in the present embodiment, and display driver circuit 23 selects 74HC573 chips,
Power circuit 21 uses three terminal regulator to export burning voltage as microprocessor 22 and current source supply.
In use, the first housing 1 is imbedded in soil completely, the second housing 2 is pasted on flowerpot, is powered, first shell
The both positive and negative polarity of constant-current source 12 in body 1 electrically connects with two pieces of pole plates 11 respectively, has electric current to flow through between two-plate 11, certainly will produce electricity
Potential difference, the voltage between two pieces of pole plates 11 is gathered by the microprocessor 22 in the second housing 2, and then calculated and be unearthed according to R=U/I
The resistance of earth, microprocessor 22 is according to electric resistance of soil and relation P=F of soil water content（R）, draw the soil currently measured
The content of moisture, wherein F are the coefficient of relationship of the electric resistance of soil and soil moisture obtained by experiment, and pass through display unit 24
The content of the soil moisture currently measured is shown, poultry feeders determine irrigation amount according to measurement result, ensure the science of watering.
The present embodiment obtains electric resistance of soil by two electrode plates 11 being embedded in soil, according to the pass of soil water content
System obtains the content of current soil moisture, and implementation process is simple, and cost is relatively low, is adapted to the potted plant cultivation of daily life, wherein
The less operand of microprocessor 22 of method of resistance is obtained using four-end method, improves the accuracy of measurement data.
Wherein the relation of electric resistance of soil and soil water content is obtained by testing, and specific experiment step is as follows：
1st, suitable flowerpot is chosen；
2nd, 2KG soil is weighed as experimental material；
3rd, the 2KG soil weighed is dried；
4th, the soil after drying is put into flowerpot；
5th, apply 500g pressure to the soil in flowerpot, reach the porosity of planting pot；
6th, the clear water of 15-20 milliliters is added into flowerpot, and flowerpot is sealed；
7th, 8 hours are stood, waits moisture to spread completely；
8th, the resistance of soil is measured, and records R；
9th, the soil taken out in flowerpot is weighed, and records m1；
10th, the soil drying of taking-up is weighed, and records m2；
11st, calculating soil water content, P=（m1-m2）/m1；
12nd, repeat step 5,6,7,8,9,10, and the amount of the clear water added every time is different, obtains multiple R and P；
13rd, with mathematical tool software, R and P are fitted, obtain R and P functional relation, P=F（R）, its relation song
Line chart is as shown in Figure 3.
Above-described is only embodiment of the present utility model, and the general knowledge such as known concrete structure and characteristic is herein in scheme
Do not describe excessively, the affiliated technology neck of utility model before one skilled in the art know the applying date or priority date
All ordinary technical knowledges in domain, prior art all in the field can be known, and it is normal before the date with applying
The ability of laboratory facilities is advised, one skilled in the art can be complete with reference to self-ability under the enlightenment that the application provides
It is apt to and implements this programme, it is real that some typical known features or known method should not turn into one skilled in the art
Apply the obstacle of the application.It should be pointed out that for those skilled in the art, the premise of the utility model structure is not being departed from
Under, several modifications and improvements can also be made, these should also be considered as the scope of protection of the utility model, and these are all without influence
The effect and practical applicability that the utility model is implemented.This application claims protection domain should be with the content of its claim
It is defined, the record such as embodiment in specification can be used for the content for explaining claim.
Claims (6)
1. soil moisture sensor, it is characterised in that including the first housing being imbedded in soil and be placed in outside soil
Two housings, first housing forward end are provided with two pieces of pole plates, are provided with constant-current source in first shell body, two pieces of pole plates respectively with perseverance
The both positive and negative polarity electrical connection of stream source；Microprocessor, display driver circuit and power circuit, the second housing top are provided with the second shell body
End is provided with display unit；
Microprocessor is used to gather the voltage between two-plate, and the resistance of soil is calculated according to the relation of voltage and electric current, according to
The relation of electric resistance of soil and soil moisture calculates soil water content and by soil water content output display；
Display unit is used to show soil water content；
Display driver circuit is used to drive display unit to show；
Power circuit is used to provide constant voltage for microprocessor and constant-current source；
Constant-current source is used to provide constant electric current for two pieces of pole plates.
2. soil moisture sensor according to claim 1, it is characterised in that the microprocessor uses
STC12C5A60S2 single-chip microcomputers.
3. soil moisture sensor according to claim 2, it is characterised in that the pole plate uses alumina plate.
4. soil moisture sensor according to claim 3, it is characterised in that the plate spacing of two pieces of pole plates is 5cm.
5. soil moisture sensor according to claim 4, it is characterised in that the plate dimensions are 5*10cm.
6. according to the soil moisture sensor described in claim any one of 1-5, it is characterised in that second housing is using double
Face gluing is attached on flowerpot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720957936.2U CN207036751U (en) | 2017-08-02 | 2017-08-02 | Soil moisture sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720957936.2U CN207036751U (en) | 2017-08-02 | 2017-08-02 | Soil moisture sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207036751U true CN207036751U (en) | 2018-02-23 |
Family
ID=61474246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720957936.2U Active CN207036751U (en) | 2017-08-02 | 2017-08-02 | Soil moisture sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207036751U (en) |
-
2017
- 2017-08-02 CN CN201720957936.2U patent/CN207036751U/en active Active
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