CN107167569A - A kind of portable moisture analyzer - Google Patents
A kind of portable moisture analyzer Download PDFInfo
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- CN107167569A CN107167569A CN201710400422.1A CN201710400422A CN107167569A CN 107167569 A CN107167569 A CN 107167569A CN 201710400422 A CN201710400422 A CN 201710400422A CN 107167569 A CN107167569 A CN 107167569A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/02—Food
- G01N33/10—Starch-containing substances, e.g. dough
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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Abstract
The invention discloses a kind of portable moisture analyzer, it is characterised in that including：Data acquisition module, main control module；The data acquisition module, weight and detection for gathering cereal to be detected flow through the frequency of the electric current of the cereal to be detected, and the data acquisition module includes：Pressure acquisition submodule and frequency collection submodule；The main control module, by for the computation rule by default settings, according to the weight and the frequency of the cereal to be detected, determining the moisture value of the cereal to be detected, wherein, the main control module by model PIC18F458 singlechip group into.Using the embodiment of the present invention, using the teaching of the invention it is possible to provide the moisture analyser in terms of a kind of small volume, carrying.
Description
Technical field
The present invention relates to water analysis technical field, more particularly to a kind of portable moisture analyzer.
Background technology
Cereal moisture percentage is the ratio of the moisture and weight included in specific cereal, be influence one of grain quality it is important
Factor.In practical application, cereal moisture percentage may decide that the security of grain storage, similarly cereal processing technology and circulation
Process needs to use.For example need to be dried in the process of cereal, drying is to reach moisture in reduction cereal
Purpose, typically using with hot blast or directly being heated to cereal, to reduce the moisture content of cereal, but be dried to assorted
Degree can stop, it is necessary to be determined by the cereal moisture percentage obtained.So that, can not in the process to cereal
Influence cereal nutritional ingredient and quality.
Moisture analyser volume of the prior art is larger, is unfavorable for carrying with, therefore it provides a kind of small volume, just
In the Moisture Meter of carrying be urgent problem to be solved.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of portable moisture analyzer, it is desirable to provide a kind of volume
Moisture analyser small, easy to carry.
To solve prior art problem, the embodiments of the invention provide a kind of portable moisture analyzer, including：Data are adopted
Collect module, main control module；
The data acquisition module, the cereal to be detected is flowed through for gathering the weight of cereal to be detected and detecting
The frequency of electric current, the data acquisition module includes：Pressure acquisition submodule and frequency collection submodule；Pressure acquisition
Module includes：The data that pressure sensor is collected are sent to AD converter by resistance R10 and resistance R14, the AD conversion
The model HX711 of device, the connection voltage VCC of pin 1 of the AD converter is simultaneously grounded, and pass through inductance by electric capacity C8, C9
L1 is connected with pin 16, and the pin 2 of the AD converter is connected to triode Q4 base stage, the triode by resistance R11
Q4 emitter stage is connected with the electric capacity VCC, and the colelctor electrode of the triode Q4 is connected with the pin 3 of the AD converter, and
The pin 3 is connected with voltage VDD, and the voltage VDD is connected by the pin 4 of AD converter described in resistance R12, described to draw
Pin 4 is connected and is grounded with the pin 5 of the AD converter by resistance R15, and the pin 6 of the AD converter passes through electric capacity C15
Ground connection, the pin 7 and pin 8 of the AD converter respectively with the data of the pressure sensor respectively with the resistance R10 and
The resistance R14 is connected, for receiving the data that the pressure sensor is collected, the pin 11 and pin of the AD converter
12 are connected with the main control module respectively；Frequency collection submodule includes：The data that capacitance sensor is collected pass through resistance R1
Transmit to inductance LH1 pin 1, the pin 3 of the inductance LH1, pin 4 and draw after the wave filter of electric capacity C1 and electric capacity C3 compositions
Pin 5 is connected, and is connected with voltage VCC, and the voltage VCC is grounded by electric capacity C2；The pin 5 of the inductance LH1 passes through
Resistance R2 and inductance LH1 pin 2 is connected to triode Q1 colelctor electrode, the colelctor electrode and emitter stage of the triode Q1
Between shunt capacitance C4, triode Q1 emitter stage pass through the electric capacity C8 and resistance R8 that are connected in parallel ground connection, three pole
Pipe Q1 base stage is connected by resistance R4 with voltage VCC, and is connected by resistance R7 with diode D1 anode, the diode
D1 minus earth；The base stage of the triode is grounded by electric capacity C6；The triode Q1 passes through electric capacity C5 and triode Q2
Base stage be connected, the base stage of the triode Q2 be connected by resistance R5 with the colelctor electrode of the triode Q2 and with voltage VCC
It is connected, the triode Q2 is grounded by resistance R9；The base stage that the triode Q2 emitter stages pass through electric capacity C7 and triode Q3
It is connected, and the base stage of the triode Q3 is connected by resistance R6 with the colelctor electrode of the triode Q3, and the triode Q3
Colelctor electrode be connected by resistance R3 with electric capacity L1 with voltage VCC, the grounded emitter of the triode Q3, the triode Q3
Colelctor electrode be connected with pulse counter, the output end of the pulse counter is connected with the main control module, the pulsimeter
The model of number device：74HC4024D；
The main control module, by for the computation rule by default settings, according to the described heavy of the cereal to be detected
Amount and the frequency, determine the moisture value of the cereal to be detected, wherein, the main control module is by model PIC18F458's
Singlechip group into.
Optionally, the data acquisition module also includes the temperature value of environment where being used to gather the cereal to be detected
Temperature acquisition submodule, the temperature acquisition submodule includes：Temperature sensor is connected with electric capacity C11, and the electric capacity C11
One end is connected to voltage VCC by resistance R9, and the other end passes through resistance R13, electric capacity by being connected to the main control module
C13 is grounded；
The main control module, for the computation rule by default settings, according to the weight of the cereal to be detected,
The frequency and the temperature value, determine the moisture value of the cereal to be detected.
Optionally, in addition to：Alarm module,
The alarm module, is alarmed for the main control module according to the moisture value；The alarm module includes：
Voice command chip U7 and loudspeaker SPK1, the Voice command chip U7 pin 2 and pin 3 are connected with SPK1, institute's predicate
Sound control chip U7 pin 1 and it is connected with electric capacity C14 one end, the other end of the electric capacity C14 and the Voice command core
Piece U7 pin 5 is connected；Pin 6, pin 7 and the pin 8 of the Voice command chip U7 is connected with the main control module respectively,
Wherein, the model of the Voice command chip U7：SC8035.
Optionally, in addition to：Key-press module, the key-press module includes：Push button signalling output module U5, the button letter
Number output module U5 pin 1 to pin 7 is respectively：KEY_OK, KEY_UP, KEY_DOWN, KEY_CHOOSE, ground connection, KEY
ON/OFF_DOWN, KEY ON/OFF, the push button signalling output module U5 pin 1 to pin 4 respectively with button S2, S3,
S4, S5 are connected, and the pin 7 of the push button signalling output module U5 is connected with button S1 one end, and is connected to triode Q5's
Base stage, the collector and emitter of the triode Q5 is grounded respectively；The base stage of the triode Q5 is with photoelectrical coupler U6's
Pin 3 is connected, and the pin 4 of the photoelectrical coupler U6 is connected to operating voltage by resistance；The photoelectrical coupler U6's draws
Pin 1 and pin 2 are connected with the main control module.
Compared with prior art, portable moisture analyzer of the invention has the advantages that：
(1) a kind of, portable moisture analyzer of the invention, can provide a kind of small volume, moisture easy to carry point
Analyzer；
(2) a kind of, portable moisture analyzer of the invention, by obtaining ambient temperature, eliminates temperature value and treats
The influence of grain temperature is detected, the accuracy rate that moisture analyser measurement detection cereal obtains moisture value can be further improved；
(3), a kind of portable moisture analyzer of the invention, can be alarmed according to measurement result, can remind use
Family measurement result, so that user is further processed, and is constantly in the monitor state to equipment without user, improves use
Experience at family.
(4), a kind of portable moisture analyzer of the invention, passes through moisture acquisition module total Weight acquisition circuit and frequency
Rate Acquisition Circuit realizes the collection to moisture, it is possible to increase the accuracy of the measurement result of condenser type moisture analyser, improves
The performance of moisture analyser；
(5), a kind of portable moisture analyzer of the invention, the parameter into trip temperature, moisture is provided for by button,
The man-machine interaction of moisture analyser of the present invention can be strengthened.
Brief description of the drawings
Fig. 1 is the circuit diagram of the acquisition module of the present invention；
Fig. 2 is the circuit diagram of the voltage conversion of the present invention；
Fig. 3 is the circuit diagram of the display circuit of the present invention；
Fig. 4 is the circuit diagram of main control module；
Fig. 5 is the circuit diagram of temperature acquisition；
Fig. 6 is the circuit diagram of alarm module；
Fig. 7 is the circuit diagram of key-press module.
Embodiment
To make the purpose, technical scheme and advantage of invention of greater clarity, below by accompanying drawing and embodiment, to this
Inventive technique scheme is further elaborated.However, it should be understood that specific embodiment described herein is only to solve
Technical solution of the present invention is released, the scope of technical scheme is not intended to limit the invention.
A kind of portable moisture analyzer is provided to solve the prior art problem embodiment of the present invention, is referring to Fig. 1, Fig. 1
The circuit diagram of data acquisition module；
The data acquisition module, the cereal to be detected is flowed through for gathering the weight of cereal to be detected and detecting
The frequency of electric current, the data acquisition module includes：Pressure acquisition submodule and frequency collection submodule；Pressure acquisition
Module includes：The data that pressure sensor is collected are sent to AD converter by resistance R10 and resistance R14, the AD conversion
The model HX711 of device, the connection voltage VCC of pin 1 of the AD converter is simultaneously grounded, and pass through inductance by electric capacity C8, C9
L1 is connected with pin 16, and the pin 2 of the AD converter is connected to triode Q4 base stage, the triode by resistance R11
Q4 emitter stage is connected with the electric capacity VCC, and the colelctor electrode of the triode Q4 is connected with the pin 3 of the AD converter, and
The pin 3 is connected with voltage VDD, and the voltage VDD is connected by the pin 4 of AD converter described in resistance R12, described to draw
Pin 4 is connected and is grounded with the pin 5 of the AD converter by resistance R15, and the pin 6 of the AD converter passes through electric capacity C15
Ground connection, the pin 7 and pin 8 of the AD converter respectively with the data of the pressure sensor respectively with the resistance R10 and
The resistance R14 is connected, for receiving the data that the pressure sensor is collected, the pin 11 and pin of the AD converter
12 are connected with the main control module respectively；Frequency collection submodule includes：The data that capacitance sensor is collected pass through resistance R1
Transmit to inductance LH1 pin 1, the pin 3 of the inductance LH1, pin 4 and draw after the wave filter of electric capacity C1 and electric capacity C3 compositions
Pin 5 is connected, and is connected with voltage VCC, and the voltage VCC is grounded by electric capacity C2；The pin 5 of the inductance LH1 passes through
Resistance R2 and inductance LH1 pin 2 is connected to triode Q1 colelctor electrode, the colelctor electrode and emitter stage of the triode Q1
Between shunt capacitance C4, triode Q1 emitter stage pass through the electric capacity C8 and resistance R8 that are connected in parallel ground connection, three pole
Pipe Q1 base stage is connected by resistance R4 with voltage VCC, and is connected by resistance R7 with diode D1 anode, the diode
D1 minus earth；The base stage of the triode is grounded by electric capacity C6；The triode Q1 passes through electric capacity C5 and triode Q2
Base stage be connected, the base stage of the triode Q2 be connected by resistance R5 with the colelctor electrode of the triode Q2 and with voltage VCC
It is connected, the triode Q2 is grounded by resistance R9；The base stage that the triode Q2 emitter stages pass through electric capacity C7 and triode Q3
It is connected, and the base stage of the triode Q3 is connected by resistance R6 with the colelctor electrode of the triode Q3, and the triode Q3
Colelctor electrode be connected by resistance R3 with electric capacity L1 with voltage VCC, the grounded emitter of the triode Q3, the triode Q3
Colelctor electrode be connected with pulse counter, the output end of the pulse counter is connected with the main control module, the pulsimeter
The model of number device：74HC4024D, is connected by pin 4 with the CAP_OUT of main control module；
The main control module, by for the computation rule by default settings, according to the described heavy of the cereal to be detected
Amount and the frequency, determine the moisture value of the cereal to be detected, wherein, the main control module is by model PIC18F458's
Singlechip group into.
By the embodiment shown in Fig. 1 of the present invention, the weight and cereal to be detected of cereal to be detected can be accurately obtained
Frequency, the circuit diagram that Fig. 1 is is a concrete mode of the embodiment of the present invention, any that the present embodiment is reasonably changed
Remain able to realize that the embodiment of effect of the embodiment of the present invention belongs to protection scope of the present invention.
The operating voltage required for data acquisition circuit and governor circuit in the embodiment of the present invention can be used such as Fig. 2 institutes
The voltage conversion circuit that shows realizes that U3 is that power supply connector is used to receive input voltage, inputted after electric capacity C1 filtering to
Voltage conversion chip U1, the model SPX1117-5.0, U1 of specific voltage conversion chip are after transformation is exported by electric capacity
C2 is filtered and by output voltage VCC_1 after diode D1, then connects electric capacity C3 and by filtered control source to voltage
Conversion chip U2, U2 output end is connected with electric capacity C4, output voltage VCC, and electric capacity C4 other end ground connection.
Specifically, portable moisture analyzer can also include display module, can there are LCD display and main control module phase
Capable realization is repeatedly kicked into, as shown in figure 3, LCD model JLX12864G-332-2-BN, pin 1 and the connection of pin 2 VCC, pin 4-
Pin 7, pin 10- pins 13 pass through LCD_D7 to LCD_D4, LCD_D3 to LCD_D0 and main control module data pin respectively
Be connected, pin 8- pins 9 by control signal LCD_ON, LCD_CD, pin 14- pins 16 by control signal LCD_RD,
LCD_RW, LCD_RS are connected with the main control chip, and Fig. 4 is each pin schematic diagram of the main control module.
It can be seen that, using the embodiment of the present invention, condenser type moisture can be realized as by data acquisition module and main control module
The detection to cereal to be detected of analysis, and circuit is relatively easy can be implemented without taking the space crossed more, therefore can be with
The moisture analyser of small volume is realized, because small volume can be easy to carry.
It is understood that data acquisition module can collect the total amount of cereal, specifically, can pass through pressure sensing
Device obtains the weight of cereal to be detected.The pressure that sensor/sensor is caused by cereal to be detected to sensor, and then obtain institute
There is the weight of cereal to be detected.In addition, the frequency of cereal to be detected can be obtained by capacitance type sensor.Specifically, electric capacity
Formula sensor is a kind of sensor that the change of measured object non electrical quantity is converted to electric capacitance change.It has high resolution, can
Carry out non-cpntact measurement, and the advantage that can be worked in the environment such as high temperature, low temperature and intense radiation.With integrated circuit electronic technology
With the development of computer technology, capacitance type sensor is by as a kind of sensor having a extensive future.
In the embodiment of the present invention, capacitance type sensor uses coaxial cylinders, is made up of two concentric metal cylindrical drum faces.If
The length of two cylindrical surface is L, and radius is respectively AR and BR, as shown in Figure 1.Work as L>>, then can be by edges at two ends when (BR-AR)
The influence of electric field inhomogeneities is ignored.So, the electric capacity of cylindrical shape capacitor is the dielectric that ε is medium in ln (π 2ABRRC ε) formula
Constant.
After weight and frequency is obtained, main control module is sent it to, main control module can be according to the meter prestored
Rule is calculated, moisture value is obtained by the numerical value of frequency and weight, display module can also be sent it to.
Exemplary, computation rule can be:
M=a1+a2xc+a3xcxT+a4xc 2
In formula, M is grain moisture value；xcFor cereal frequency；A0, a1, a2, a3, a4 are respectively
Number.
It is understood that the environment where the moisture value and cereal of the cereal measured has close relationship, such as
Temperature there are different influences to the moisture value of cereal, based on this, in the embodiment of the present invention, also to measure cereal institute to be detected
In the temperature of environment, further, the data acquisition module also includes environment where being used to gather the cereal to be detected
The temperature acquisition submodule of temperature value, as shown in figure 5, the temperature acquisition submodule includes：Temperature sensor and electric capacity C11 phases
Even, and one end of the electric capacity C11 is connected to voltage VCC by resistance R9, the other end by being connected to the main control module, and
It is grounded by resistance R13, electric capacity C13；The main control module, for the computation rule by default settings, according to described to be checked
The weight, the frequency and the temperature value of cereal are surveyed, the moisture value of the cereal to be detected is determined.
Specifically, computation rule can be：
M=a0xT+a1+a2xc+a3xcxT+a4xc 2
Wherein, a0For the temperature coefficient set according to temperature value, xTFor temperature value.
Using the embodiment shown in Fig. 5 of the present invention, measurement moisture value of the temperature to cereal to be detected can be further eliminated
Influence, can further improve moisture analyser measurement detection cereal and obtain the accuracy rate of moisture value.
In the embodiment of the present invention, specific calculation formula is only one embodiment of the present of invention, is not constituted to the present invention
Specific restriction.
Further, in addition to：Alarm module,
Referring to Fig. 6, the alarm module is alarmed for the main control module according to the moisture value；The alarm
Module includes：Voice command chip U7 and loudspeaker SPK1, the Voice command chip U7 pin 2 and pin 3 and SPK1 phases
Even, the pin 1 of the Voice command chip U7 and be connected with electric capacity C14 one end, the other end and institute's predicate of the electric capacity C14
Sound control chip U7 pin 5 is connected；Pin 6, pin 7 and the pin 8 of the Voice command chip U7 respectively with the master control
Module is connected, wherein, the model of the Voice command chip U7：SC8035.
Using the embodiment shown in Fig. 6 of the present invention, the signal of main control module transmission can be received, for carrying out voice broadcast
Reach the purpose of alarm, it is not necessary to which user is monitored, the purpose for reminding user can be just reached by audio alert.Being capable of root
Alarmed according to measurement result, user's measurement result can be reminded, so that user is further processed, and without user always
In the monitor state to equipment, Consumer's Experience is improved.
Referring to Fig. 7, Fig. 7 is the circuit diagram of key-press module, and the key-press module includes：Push button signalling output module U5, institute
Pin 1 to the pin 7 for stating push button signalling output module U5 is respectively：KEY_OK, KEY_UP, KEY_DOWN, KEY_CHOOSE, connect
Ground, KEY ON/OFF_DOWN, KEY ON/OFF, the pin 1 of the push button signalling output module U5 to pin 4 respectively with button
S2, S3, S4, S5 are connected, and the pin 7 of the push button signalling output module U5 is connected with button S1 one end, and is connected to three poles
Pipe Q5 base stage, the collector and emitter of the triode Q5 is grounded respectively；The base stage and photoelectric coupling of the triode Q5
Device U6 pin 3 is connected, and the pin 4 of the photoelectrical coupler U6 is connected to operating voltage by resistance；The photoelectrical coupler
U6 pin 1 and pin 2 is connected with the main control module.
In the embodiment of the present invention, it can be abated the noise the influence to signal by photoelectrical coupler, further improve moisture
The performance of analyzer.
Specifically, can by button set temperature threshold, or water content detection desired value (when reaching the desired value
Stop detection, or alarmed using alarm module), it can further improve Consumer's Experience.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It may be appreciated other embodiment.
Claims (4)
1. a kind of portable moisture analyzer, it is characterised in that including：Data acquisition module, main control module；
The data acquisition module, weight and detection for gathering cereal to be detected flow through the electric current of the cereal to be detected
Frequency, the data acquisition module includes：Pressure acquisition submodule and frequency collection submodule；The pressure acquisition submodule
Including：The data that pressure sensor is collected are sent to AD converter by resistance R10 and resistance R14, the AD converter
Model HX711, the AD converter pin 1 connection voltage VCC simultaneously by electric capacity C8, C9 be grounded, and by inductance L1 with
Pin 16 is connected, and the pin 2 of the AD converter is connected to triode Q4 base stage by resistance R11, the triode Q4's
Emitter stage is connected with the electric capacity VCC, and the colelctor electrode of the triode Q4 is connected with the pin 3 of the AD converter, and described
Pin 3 is connected with voltage VDD, and the voltage VDD is connected by the pin 4 of AD converter described in resistance R12, the pin 4
It is connected and is grounded with the pin 5 of the AD converter by resistance R15, the pin 6 of the AD converter is connect by electric capacity C15
Ground, the pin 7 and pin 8 of the AD converter respectively with the data of the pressure sensor respectively with the resistance R10 and institute
State resistance R14 to be connected, for receiving the data that the pressure sensor is collected, the pin 11 and pin 12 of the AD converter
It is connected respectively with the main control module；Frequency collection submodule includes：The data that capacitance sensor is collected are by resistance R1 electricity
Transmitted after the wave filter for holding C1 and electric capacity C3 compositions to inductance LH1 pin 1, pin 3, pin 4 and the pin of the inductance LH1
5 are connected, and are connected with voltage VCC, and the voltage VCC is grounded by electric capacity C2；The pin 5 of the inductance LH1 passes through electricity
Resistance R2 and the inductance LH1 pin 2 are connected to triode Q1 colelctor electrode, the colelctor electrode and emitter stage of the triode Q1 it
Between shunt capacitance C4, triode Q1 emitter stage pass through the electric capacity C8 and resistance R8 that are connected in parallel ground connection, the triode
Q1 base stage is connected by resistance R4 with voltage VCC, and is connected by resistance R7 with diode D1 anode, the diode D1
Minus earth；The base stage of the triode is grounded by electric capacity C6；The triode Q1 passes through electric capacity C5's and triode Q2
Base stage be connected, the base stage of the triode Q2 be connected by resistance R5 with the colelctor electrode of the triode Q2 and with voltage VCC phases
Even, the triode Q2 is grounded by resistance R9；The base stage phase that the triode Q2 emitter stages pass through electric capacity C7 and triode Q3
Connect, and the base stage of the triode Q3 is connected by resistance R6 with the colelctor electrode of the triode Q3, and the triode Q3
Colelctor electrode is connected by resistance R3 with electric capacity L1 with voltage VCC, the grounded emitter of the triode Q3, the triode Q3's
Colelctor electrode is connected with pulse counter, and the output end of the pulse counter is connected with the main control module, the step-by-step counting
The model of device：74HC4024D；
The main control module, by for the computation rule by default settings, according to the weight of the cereal to be detected and
The frequency, determines the moisture value of the cereal to be detected, wherein, the main control module by model PIC18F458 monolithic
Machine is constituted.
2. portable moisture analyzer according to claim 1, it is characterised in that the data acquisition module also includes using
The temperature acquisition submodule of the temperature value of environment where the cereal to be detected is gathered, the temperature acquisition submodule includes：
Temperature sensor is connected with electric capacity C11, and one end of the electric capacity C11 is connected to voltage VCC by resistance R9, and the other end passes through
The main control module is connected to, and is grounded by resistance R13, electric capacity C13；
The main control module, for the computation rule by default settings, according to the weight of the cereal to be detected, described
Frequency and the temperature value, determine the moisture value of the cereal to be detected.
3. portable moisture analyzer according to claim 1, it is characterised in that also include：Alarm module,
The alarm module, is alarmed for the main control module according to the moisture value；The alarm module includes：Voice
Control chip U7 and loudspeaker SPK1, the Voice command chip U7 pin 2 and pin 3 are connected with SPK1, the voice control
Coremaking piece U7 pin 1 and it is connected with electric capacity C14 one end, the other end of the electric capacity C14 and the Voice command chip U7
Pin 5 be connected；Pin 6, pin 7 and the pin 8 of the Voice command chip U7 is connected with the main control module respectively, its
In, the model of the Voice command chip U7：SC8035.
4. the portable moisture analyzer according to claim any one of 1-3, it is characterised in that also include：Key-press module,
The key-press module includes：Push button signalling output module U5, pin 1 to the pin 7 of the push button signalling output module U5 is distinguished
For：KEY_OK, KEY_UP, KEY_DOWN, KEY_CHOOSE, ground connection, KEY ON/OFF_DOWN, KEY ON/OFF, the button
Signal output module U5 pin 1 to pin 4 is connected with button S2, S3, S4, S5 respectively, the push button signalling output module U5
Pin 7 be connected with button S1 one end, and be connected to triode Q5 base stage, the collector and emitter of the triode Q5
It is grounded respectively；The base stage of the triode Q5 is connected with photoelectrical coupler U6 pin 3, the pin 4 of the photoelectrical coupler U6
Operating voltage is connected to by resistance；The pin 1 and pin 2 of the photoelectrical coupler U6 is connected with the main control module.
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| CN201710400422.1A CN107167569A (en) | 2017-05-31 | 2017-05-31 | A kind of portable moisture analyzer |
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| CN201710400422.1A CN107167569A (en) | 2017-05-31 | 2017-05-31 | A kind of portable moisture analyzer |
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| JPS5643533A (en) * | 1979-09-18 | 1981-04-22 | Iseki & Co Ltd | Measuring method of water content of grain in drying machine |
| CN2043360U (en) * | 1988-11-12 | 1989-08-23 | 商业部四川粮食储藏科学研究所 | Multifunctional grain detector |
| CN101344500A (en) * | 2008-08-21 | 2009-01-14 | 窦祥增 | Capacitor type grain and oil moisture tester |
| CN202599894U (en) * | 2012-05-30 | 2012-12-12 | 杭州麦哲仪器有限公司 | Grain moisture meter |
| CN103868954A (en) * | 2014-03-25 | 2014-06-18 | 成都国科海博信息技术股份有限公司 | Grain humidity detection circuit |
| CN205786451U (en) * | 2016-05-31 | 2016-12-07 | 林松志 | A kind of condenser type grain moisture detector |
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