CN101625333B - Intelligent type moisture sensor - Google Patents
Intelligent type moisture sensor Download PDFInfo
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- CN101625333B CN101625333B CN200910041711.2A CN200910041711A CN101625333B CN 101625333 B CN101625333 B CN 101625333B CN 200910041711 A CN200910041711 A CN 200910041711A CN 101625333 B CN101625333 B CN 101625333B
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Abstract
The invention discloses an intelligent type moisture sensor which comprises a circuit board arranged between an upper shell and a lower shell as well as a sensor perfused between an upper sensor shell and a lower sensor shell; wherein the circuit board is provided with a singlechip MCU and an auxiliary circuit, and two-way input/output end P2 pin of the MCU is connected with a test circuit with low energy consumption. The test circuit is a RC circuit consisting of a variable resistance RT1, a fixed resistance R2, a fixed resistance R3 and a capacitor C1. The variable resistance RT1 is connected with a P2.0 pin of the MCU, the fixed resistance R2 is connected with a P2.1 pin of the MCU, and the fixed resistance R3 is connected with a P2.2 pin of the MCU. Three subcircuits of the variable resistance RT1, the fixed resistance R2 and the fixed resistance R3 are connected with each other in parallel, then are connected with the capacitor C1 in series and finally in ground connection. The intelligent type moisture sensor is little in energy consumption and long in service life, and can be in good synchronization with the moisture change of the tested environment.
Description
Technical field
The present invention relates to a kind of intelligent type moisture sensor, relate in particular to the special sensor of a kind of resistance-type moisture.
Background technology
The moisture transducer principle having on market now mainly contains: the principles such as microwave measurement, electromagnetic field of high frequency condenser type principle, specific inductive capacity, the power consumption of these products is larger, cannot meet the long-time requirement of using of battery power supply system.Also have macromolecule moisture transducer, but macromolecule moisture transducer is after absorbing moisture, if when the moisture of surrounding environment diminishes, in macromolecule moisture transducer, moisture cannot diminish, and shows as: can absorb water, can not discharge moisture.
CN2575668 Multiside biological chip; include netted plastic protective cover, porous ceramics filtering layer, the wet gypsum body of sense, metal electrode and jointly form by being connected the connected transmitter being formed by Ad μ C812 single-chip microcomputer and peripheral circuit thereof of wire with it; can be used for the occasions such as the irrigation of agriculture land for growing field crops, the fertilising of warmhouse booth nutrient solution, the irrigation of lawn, field trees and maintenance, realize soil moisture content is carried out to real-time on-line measurement.
Summary of the invention
For the shortcoming of prior art, the technical problem to be solved in the present invention is to provide little, the long-life intelligent type moisture sensor of a kind of power consumption.
For solving the problems of the technologies described above the technical scheme of taking, be: a kind of intelligent type moisture sensor, be included in the circuit board between upper and lower shell and be poured in the sensor between upper and lower sensor shell, described circuit board is provided with single-chip microprocessor MCU and auxiliary circuit, is connected with the test circuit of low-power consumption at the two-way input/output terminal P2 pin of single-chip microprocessor MCU.
Further, in above-mentioned intelligent type moisture sensor, the RC circuit that described test circuit is comprised of variable resistor RT1, fixed resistance R2, fixed resistance R3, capacitor C 1; Variable resistor RT1 is connected with the P2.0 pin of single-chip microprocessor MCU, and fixed resistance R2 is connected with the P2.1 pin of single-chip microprocessor MCU, and fixed resistance R3 is connected with the P2.2 pin of single-chip microprocessor MCU; Three branch roads of variable resistor RT1, fixed resistance R2, fixed resistance R3 and connect after ground connection after series capacitance C1 again.Described auxiliary circuit comprises the single-chip microprocessor MCU program debug circuit CON7 connected with the two-way input/output terminal P1 pin of single-chip microprocessor MCU, the power circuit being connected with the power supply input pin VCC of single-chip microprocessor MCU, the crystal oscillator Y1 being connected with the clock signal input XIN/ output XOUT of single-chip microprocessor MCU, the reset circuit being connected with the reset signal input end RST/NMI pin of MCU.
Described reset circuit is ground connection after power input VCC connects with resistance R 4, capacitor C 3, and the node of resistance R 4 and capacitor C 3 is connected with the reset signal input end RST/NMI pin of single-chip microprocessor MCU.
Further again: above-mentioned intelligent type moisture sensor, described sensor is symmetricly set on the both sides of circuit board.In order well to change and to synchronize with test environment moisture, described sensor material is to synchronize the medium layer of variation with the moisture of test environment, and described medium layer is gypsum.Described sensor is also enclosed with part exploring electrode, and exposed electrode is connected with the test circuit on circuit board by flexible cord.Described upper casing and upper sensor shell are spliced into complete upper shell, and lower casing and lower sensor shell are spliced into complete lower house, and upper-lower casing is combined into a complete cavity by O-ring seal.In described cavity, be also provided with the supplying cell being connected with circuit board, described cavity is elliposoidal.On described circuit board, be also provided with display screen, on described upper casing, be also provided with and conveniently see the transparency window that shows data.
Compared with prior art: intelligent type moisture sensor of the present invention, be included in the circuit board between upper and lower shell and be poured in the sensor between upper and lower sensor shell, described circuit board is provided with single-chip microprocessor MCU and auxiliary circuit, is connected with the test circuit of low-power consumption at the two-way input/output terminal P2 pin of MCU.So this moisture transducer power consumption is little, the life-span is long, adopts ultralow low-power consumption in circuit design, be applicable to the long-time electric power system of battery.The lithium battery of one joint 2Ah can be worked and be reached more than 6 years, at standby mode electric current, is less than 10uA, and mode of operation electric current is less than 1mA.Further, the resistance value that the present invention has utilized a kind of medium reduces with the increase of test environment moisture, if moisture diminishes, in medium, moisture can be synchronous preferably, and the method that can demarcate by experiment like this need to be surveyed the place of moisture medium moisture transducer for other.By measuring the resistance value of medium sensor, just can obtain the moisture in measured object surrounding environment.
Accompanying drawing explanation
Fig. 1 is the circuit structure schematic diagram of the embodiment of the present invention;
Fig. 2 is structure explosive view of the present invention;
Wherein 1 circuit board, 2 upper casings, 3 lower casings, 4 upper sensor shells, 5 lower sensor shells, 6 exploring electrodes, 7 O-ring seals, 8 supplying cells, 9 display screens, 10 transparency windows.
Embodiment
For the ease of those skilled in the art will recognize that below in conjunction with preferred embodiment of the present invention and coordinating accompanying drawing, structure of the present invention and specific works method are described in detail as after.
With reference to Fig. 1-2: a kind of intelligent type moisture sensor, be included in the circuit board 1 between upper and lower shell 2,3 and be poured in the sensor between upper and lower sensor shell 4,5, described circuit board is provided with single-chip microprocessor MCU and auxiliary circuit, is connected with the test circuit of low-power consumption at the two-way input/output terminal P2 pin of single-chip microprocessor MCU.
The RC circuit that described test circuit is comprised of variable resistor RT1, fixed resistance R2, fixed resistance R3, capacitor C 1; Variable resistor RT1 is connected with the P2.0 pin of MCU, and fixed resistance R2 is connected with the P2.1 pin of single-chip microprocessor MCU, and fixed resistance R3 is connected with the P2.2 pin of single-chip microprocessor MCU; Three branch roads of variable resistor RT1, fixed resistance R2, fixed resistance R3 and connect after ground connection after series capacitance C1 again.
Described auxiliary circuit comprises the single-chip microprocessor MCU program debug circuit CON7 connected with the two-way input/output terminal P1 pin of single-chip microprocessor MCU, the power circuit being connected with the power supply input pin VCC of single-chip microprocessor MCU, the crystal oscillator Y1 being connected with the clock signal input XIN/ output XOUT of single-chip microprocessor MCU, the reset circuit being connected with the reset signal input end RST/NMI pin of single-chip microprocessor MCU.
Described reset circuit is ground connection after power input VCC connects with resistance R 4, capacitor C 3, and the node of resistance R 4 and capacitor C 3 is connected with the reset signal input end RST/NMI pin of single-chip microprocessor MCU.
Described sensor is symmetricly set on the both sides of circuit board 1.In order well to change with test environment moisture, synchronize, described sensor material be and the synchronous medium layer of variation of the moisture of test environment that described medium layer is gypsum.Described sensor is also enclosed with part exploring electrode 6, and exposed electrode is connected with the test circuit on circuit board 1 by flexible cord.
Described upper casing 2 is spliced into complete upper shell with upper sensor shell 4, and lower casing 3 is spliced into complete lower house with lower sensor shell 5, and upper-lower casing is combined into a complete cavity by O-ring seal 7.In described cavity, be also provided with the supplying cell 8 being connected with circuit board 1, described cavity is elliposoidal.
On described circuit board 1, be also provided with display screen 9, on described upper casing, be also provided with and conveniently see the transparency window 10 that shows data.
Above-mentioned intelligent type moisture sensor is when work, and described single-chip microprocessor MCU is selected the MSP430 series monolithic MCU of the Ti of the minimum merit lowest power consumption of industry; At standby mode, be 0.6uA, mode of operation is 200uA.During work, first P2.0, P2.1, P2.2 are made as to low level output, C1 are discharged to and discharge.P2.0, P2.2 are set to input state, P2.1 is made as high level output, by R2 resistance, C1 is charged, the zero clearing of single-chip microcomputer internal timer also starts timing, detect P2.2 mouth state, when P2.2 mouth detects as high level, when the voltage on C1 reaches the door embedding voltage of single-chip microcomputer high level input, under single-chip microcomputer timer record from starting to be charged to the time T 1 that P2.2 mouth changes high level into.P2.0, P2.1, P2.2 are made as to low level output, C1 are discharged to and discharge.P2.1, P2.2 are set to input state again, P2.0 is made as high level output, by RT1 resistance, C1 is charged, the zero clearing of single-chip microcomputer internal timer also starts timing, detect P2.2 mouth state, when P2.2 mouth detects as high level, under single-chip microcomputer timer record from starting to be charged to the time T 2 that P2.2 mouth changes high level into.The resistance of described variable resistor RT1 changes with the change of moisture, and T1/R2=T2/RT1, i.e. RT1=T2 * R2/T1, and variable resistor RT1 is moisture sensor resistance value.By single-chip microprocessor MCU, calculate the resistance of resistance R T1, it is as shown in table 1 that the method by the interpolation of tabling look-up obtains moisture ratio value.
Table 1: experimental data measured value
In this embodiment: R3=150K Ω; R2=200K Ω (+-1) %; C1=0.1uF; C3=10uF; R4=100K; C2=0.1uF; Y1=32.768KHz
It should be noted that, these are only preferred embodiment of the present invention, conceive under prerequisite not departing from the present invention, any subtle change that the present invention is done and be equal to replacement, all belongs to protection scope of the present invention.
Claims (3)
1. an intelligent type moisture sensor, be included in the circuit board (1) between upper and lower shell (2,3) and be poured in the sensor between upper and lower sensor shell (4,5), it is characterized in that: described circuit board is provided with single-chip microprocessor MCU and auxiliary circuit, at the two-way input/output terminal P2 pin of single-chip microprocessor MCU, be connected with the test circuit of low-power consumption;
The RC circuit that described test circuit is comprised of variable resistor RT1, fixed resistance R2, fixed resistance R3, capacitor C 1; Variable resistor RT1 is connected with the P2.0 pin of single-chip microprocessor MCU, and fixed resistance R2 is connected with the P2.1 pin of single-chip microprocessor MCU, and fixed resistance R3 is connected with the P2.2 pin of single-chip microprocessor MCU; Three branch roads of variable resistor RT1, fixed resistance R2, fixed resistance R3 and connect after ground connection after series capacitance C1 again;
Described auxiliary circuit comprises the single-chip microprocessor MCU program debug circuit CON7 connected with the two-way input/output terminal P1 pin of single-chip microprocessor MCU, the power circuit being connected with the power input VCC of single-chip microprocessor MCU, the crystal oscillator Y1 being connected with the clock signal input XIN/ output XOUT of single-chip microprocessor MCU, the reset circuit being connected with the reset signal input end RST/NMI pin of single-chip microprocessor MCU;
Described reset circuit is ground connection after power input VCC connects with resistance R 4, capacitor C 3, and the node of resistance R 4 and capacitor C 3 is connected with the reset signal input end RST/NMI pin of single-chip microprocessor MCU;
Described sensor material is to synchronize the medium layer changing with the moisture of test environment, and described medium layer is gypsum; Described sensor is also enclosed with part exploring electrode (6), and exposed electrode is connected with the test circuit on circuit board (1) by flexible cord;
Described upper casing (2) is spliced into complete upper shell with upper sensor shell (4), lower casing (3) and lower sensor shell 5) be spliced into complete lower house, upper-lower casing is combined into a complete cavity by O-ring seal (7);
In described cavity, be also provided with the supplying cell being connected with circuit board (1), described cavity is elliposoidal.
2. intelligent type moisture sensor according to claim 1, is characterized in that: described sensor is symmetricly set on the both sides of circuit board (1).
3. intelligent type moisture sensor according to claim 2, is characterized in that: on described circuit board (1), be also provided with display screen (9), be also provided with and conveniently see the transparency window (10) that shows data on described upper casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910041711.2A CN101625333B (en) | 2009-08-05 | 2009-08-05 | Intelligent type moisture sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910041711.2A CN101625333B (en) | 2009-08-05 | 2009-08-05 | Intelligent type moisture sensor |
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| Publication Number | Publication Date |
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| CN101625333A CN101625333A (en) | 2010-01-13 |
| CN101625333B true CN101625333B (en) | 2014-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910041711.2A Expired - Fee Related CN101625333B (en) | 2009-08-05 | 2009-08-05 | Intelligent type moisture sensor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036532B (en) * | 2011-10-10 | 2016-10-12 | 神讯电脑(昆山)有限公司 | Automatic testing circuit for low power elements |
| CN103472096B (en) * | 2013-09-06 | 2015-05-06 | 武汉凯特复兴科技有限责任公司 | Measurement method for circuit of resistance-type moisture measurement sensor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4816748A (en) * | 1986-08-28 | 1989-03-28 | Nippon Mining Co., Ltd. | Electronic thermohygrometer with square-wave pulse signal generator |
| CN2575668Y (en) * | 2002-11-01 | 2003-09-24 | 北京农业信息技术研究中心 | Multiside biological chip |
| CN2596327Y (en) * | 2003-02-17 | 2003-12-31 | 中国农业大学 | New intelligent sensor for temperature and humidity |
| CN101236188A (en) * | 2007-01-31 | 2008-08-06 | 北京林业大学 | Soil moisture wireless measuring apparatus |
-
2009
- 2009-08-05 CN CN200910041711.2A patent/CN101625333B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4816748A (en) * | 1986-08-28 | 1989-03-28 | Nippon Mining Co., Ltd. | Electronic thermohygrometer with square-wave pulse signal generator |
| CN2575668Y (en) * | 2002-11-01 | 2003-09-24 | 北京农业信息技术研究中心 | Multiside biological chip |
| CN2596327Y (en) * | 2003-02-17 | 2003-12-31 | 中国农业大学 | New intelligent sensor for temperature and humidity |
| CN101236188A (en) * | 2007-01-31 | 2008-08-06 | 北京林业大学 | Soil moisture wireless measuring apparatus |
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| CN101625333A (en) | 2010-01-13 |
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