CN108760989A - A kind of air-quality monitoring system and its monitoring method - Google Patents
A kind of air-quality monitoring system and its monitoring method Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007789 gas Substances 0.000 claims abstract description 103
- 238000012545 processing Methods 0.000 claims abstract description 65
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 27
- 230000036772 blood pressure Effects 0.000 claims abstract description 11
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims description 18
- 230000006837 decompression Effects 0.000 claims description 15
- 239000004973 liquid crystal related substance Substances 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 12
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- 238000001914 filtration Methods 0.000 claims description 5
- 101000746134 Homo sapiens DNA endonuclease RBBP8 Proteins 0.000 claims description 3
- 101000969031 Homo sapiens Nuclear protein 1 Proteins 0.000 claims description 3
- 102100021133 Nuclear protein 1 Human genes 0.000 claims description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 14
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- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 101001128814 Pandinus imperator Pandinin-1 Proteins 0.000 description 1
- 101001024685 Pandinus imperator Pandinin-2 Proteins 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
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- 230000005518 electrochemistry Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
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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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
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Abstract
The invention discloses a kind of air-quality monitoring system and its monitoring method, air-quality monitoring system includes power module, gas collecting processing module, data processing module and memory module；Electric power source pair of module input voltage exports several power voltage supplies after carrying out direct current conversion, lowering and stabilizing blood pressure；Gas collecting processing module carries out concentration acquisition to different type gas and VOCs gases by built-in gas sensor and exports corresponding concentration signal, concentration signal is amplified, is followed, filter after export corresponding voltage signal；Voltage signal is converted into digital signal by data processing module, and to digital signal obtain after temperature and humidity compensation the concentration values of corresponding gas according to the ambient temperature and humidity of acquisition, and concentration values are passed through RS485 communication outputs；Memory module stores product information, manufacture parameter and calibration parameter.Multiple gases sensor is integrated together, for existing pure gas detection module, is easy for more gas detections are more convenient.
Description
Technical field
The present invention relates to gas monitoring techniques field, more particularly to a kind of air-quality monitoring system and its monitoring method.
Background technology
With the rapid development of modern times industry, the mankind are also increasingly prominent to the destruction of environment.China also promulgates in recent years
A plurality of laws and regulations are directed to the monitorings and improvement of environmental quality, and nowadays air quality has become that people are daily to be paid close attention to the most
One of social class topic.How convenient, fast, effective monitoring air quality ensures that good air quality is indispensable to become
One of means.
Atmosphere quality monitoring device common at present is frequently with single gas collecting module（Gas sensor）, output letter
Number IIC（Inter-Integrated Circuit）Signal, 4-20mA（The letter that minimum current is 4mA, maximum current is 20mA
Number）, the gas collectings signal such as RS485；Pass through common ADC（Analog-to-digital conversion）Gas concentration data are calculated after data acquisition,
Final result is exported with digital signal.But the shortcomings that this mode, is：If monitoring multiple gases simultaneously, need to be correspondingly arranged
Multiple gas collecting modules are inconvenient to install multiple gas collecting modules on existing circuit board, are also unfavorable for product structure
Design and modularized design, it is long to extend the R&D cycle, increases design cost height, is also added while improving design risk
System power dissipation.Influence of the ambient temperature and humidity variation to gas sensor detection data can't be excluded in time, gas sensor
Calibration needs to carry out by external equipment, it has not been convenient to the amendment of gas data.
Thus the prior art could be improved and improve.
Invention content
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of air-quality monitoring system and
Its monitoring method, to solve the problems, such as existing atmosphere quality monitoring device progress multiple gases while detect inconvenience.
In order to achieve the above object, this invention takes following technical schemes：
A kind of air-quality monitoring system comprising：Power module, gas collecting processing module, data processing module and storage
Module；
Several voltages are exported after the electric power source pair of module input voltage progress direct current conversion, lowering and stabilizing blood pressure to be powered；Gas
Acquisition processing module carries out concentration acquisition by built-in gas sensor to several different types of gases and VOCs gases
And export corresponding concentration signal, concentration signal is amplified, is followed, filter after export corresponding voltage signal；At data
Voltage signal is converted into digital signal by reason module, and carries out temperature and humidity compensation to digital signal according to the ambient temperature and humidity of acquisition
Concentration values are communicated by RS485 and are exported by the concentration values for obtaining corresponding gas afterwards；The memory module is for storing product
Information, manufacture parameter and calibration parameter.
In the air-quality monitoring system, the power module includes input processing circuit, power supply circuit, direct current
Source circuit, probe power circuit and VOCs probe power circuits：
Decompression is supply voltage after the input processing circuit carries out EMI filtering to input voltage；
It is data processing module power supply that supply voltage decompression is first voltage by the power supply circuit；
The DC voltage that supply voltage decompression is 5V is carried out 5V power supplies by the DC power supply circuit；
The second voltage that supply voltage decompression is 6V is the power supply of gas collecting processing module by the probe power circuit, also right
Second voltage lowering and stabilizing blood pressure is the reference voltage of 2.5V and exports to gas collecting processing module；
It is the power supply of VOCs sensors that supply voltage decompression is PID voltages by the VOCs probe powers circuit.
Further include by interactive interface, LCD liquid crystal display screen and several key groups in the air-quality monitoring system
At human-computer interaction module；LCD liquid crystal display screen and several buttons are connect by interactive interface with data processing module；
The interactive interface is used between LCD liquid crystal display screen and data processing module, between button and data processing module
Data interaction；LCD liquid crystal display screen provides operation interface and carries out modular calibration and tune for showing real-time gas concentration
Examination；Several buttons are for inputting corresponding key value to carry out the selection or adjustment of parameter.
In the air-quality monitoring system, the data processing module includes microcontroller, first interface, the first electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the first capacitance, the second capacitance and third capacitance；
1st foot of the 2nd foot connection microcontroller of the first interface is also grounded by second resistance；3rd foot of first interface
It connects the 2nd foot of microcontroller, be also grounded by 3rd resistor；One end of the 4th foot connection first resistor of first interface, first
One end of capacitance and the RST feet of microcontroller, the 5th foot of first interface and the other end of first resistor are all connected with feeder ear, the
1st foot of one interface and the other end of the first capacitance are grounded, and the P2.5 feet of microcontroller connect the 1st foot of the first crystal oscillator, the
One end of one end of three capacitances and the 4th resistance；2nd foot of P2.4 feet the first crystal oscillator of connection of microcontroller, the one of the second capacitance
The other end at end and the 4th resistance；The 3rd foot, the other end of the second capacitance and the other end of third capacitance of first crystal oscillator connect
Ground；AIO0 feet, AIO1 feet, AIO2 feet, AIO3 feet, P3.2 feet, P3.3 feet, P3.4 feet, the P3.5 feet of microcontroller are all connected with gas
Body acquisition processing module；The COM0 feet of microcontroller, COM1 feet, COM2 feet, COM3 feet, P10.2 feet, P10.3 feet, P6.0 feet,
P6.1 feet, P6.2 feet, P6.3 feet, P6.4 feet, P6.5 feet, P6.6 feet, P6.7 feet respectively with the 2nd foot of interactive interface, the 1st foot,
4th foot, the 3rd foot, the 6th foot, the 5th foot, the 8th foot, the 7th foot, the 10th foot, the 9th foot, the 12nd foot, the 11st foot, the 14th foot, the 13rd foot
One-to-one connection.
In the air-quality monitoring system, the data processing module further include the first indicator light, the second indicator light,
5th resistance and the 6th resistance；
The P10.0 feet of the microcontroller connect the anode of the first indicator light by the 5th resistance, and the P10.1 feet of microcontroller are logical
The anode that the 6th resistance connects the second indicator light is crossed, the cathode of the first indicator light connects the cathode and ground of the second indicator light.
In the air-quality monitoring system, the memory module includes memory, the 7th resistance, the 8th resistance,
Four capacitances and magnetic bead；
The VCC feet of the memory connect one end of the 4th capacitance, also by magnetic bead connect power end；The WP feet of memory connect
The other end and ground of 4th capacitance, the P2.0 feet of the SCL feet connection microcontroller of memory also pass through the 7th resistance connection power supply
End；The P2.1 feet of the SDA feet connection microcontroller of memory also pass through the 8th resistance connection power end.
In the air-quality monitoring system, the gas sensor includes carbon monoxide transducer, sulfur dioxide biography
Sensor, carbon dioxide sensor, ozone sensor and VOCs sensors.
A kind of monitoring method using the air-quality monitoring system comprising：
A, several voltages are exported after the conversion of electric power source pair of module input voltage progress direct current, lowering and stabilizing blood pressure to be powered；
B, gas collecting processing module by built-in gas sensor to several different types of gases and VOCs gases into
Row concentration acquires and exports corresponding concentration signal, concentration signal is amplified, is followed, filter after export corresponding voltage letter
Number；
C, voltage signal is converted into digital signal by data processing module, and according to the ambient temperature and humidity of acquisition to digital signal into
Concentration values are communicated by RS485 and are exported by the concentration values that corresponding gas is obtained after row temperature and humidity compensation.
Compared to the prior art, air-quality monitoring system provided by the invention and its monitoring method, pass through power module
It is powered to exporting several voltages after the conversion of input voltage progress direct current, lowering and stabilizing blood pressure；Gas collecting processing module passes through
Built-in gas sensor carries out concentration acquisition to several different types of gases and VOCs gases and exports corresponding concentration
Signal, concentration signal is amplified, is followed, filter after export corresponding voltage signal；Data processing module is by voltage signal
It is converted into digital signal, and corresponding gas is obtained after carrying out temperature and humidity compensation to digital signal according to the ambient temperature and humidity of acquisition
Concentration values are communicated by RS485 and are exported by concentration values；The memory module for store product information, manufacture parameter and
Calibration parameter.By the way that multiple gases sensor is integrated together, for existing pure gas detection module, for
More gas detections are more convenient, are easier；It is monitored while greatly facilitating multiple gases, also adds VCOs gas concentrations prison
It surveys, abundanter data basis is provided for air quality monitoring.It can reduce humiture variation to gas by temperature and humidity compensation
The influence of body sensor detection data keeps monitoring result more accurate.
Description of the drawings
Fig. 1 is the structure diagram of air-quality monitoring system provided by the invention.
Fig. 2 is the circuit diagram of data processing module in air-quality monitoring system provided by the invention.
Fig. 3 is the circuit diagram of filter circuit in air-quality monitoring system provided by the invention.
Fig. 4 is the circuit diagram of memory module in air-quality monitoring system provided by the invention.
Fig. 5 is air quality monitoring method flow chart provided by the invention.
Specific implementation mode
A kind of air-quality monitoring system of present invention offer and its monitoring method are related to sensor, atmospheric environment detects, is more
The technologies such as parameter gas detection, the acquisition of gas concentration data, Internet of Things transmission, mainly for gas detecting instrument, environmental quality
Monitoring system etc. has preferable application.To make the purpose of the present invention, technical solution and effect clearer, clear and definite, join below
Developing simultaneously according to attached drawing, the present invention is described in more detail for embodiment.It should be appreciated that specific embodiment described herein only to
It explains the present invention, is not intended to limit the present invention.
Referring to Fig. 1, air-quality monitoring system provided in an embodiment of the present invention includes power module 10, at gas collecting
Manage module 20 and data processing module 30.The power module 10 connects gas collecting processing module 20 and data processing module
30, gas collecting processing module 20 connects data processing module 30, and data processing module 30 is communicated with monitoring host computer or cloud platform
Connection.
The power module 10 is used to power for whole system, by input voltage（Ranging from direct current 9V ~ 24V）Carry out direct current
Several voltages are exported after conversion, lowering and stabilizing blood pressure（Including AVCC6V, AVCC2.5V, AVCC-ADJ, DVCC3.3V, DVCC5V,
DVCCA3.3V）To corresponding module for power supply.The virtual value of the power supply ripple of each supply voltage of output is respectively less than 10mV, power supply
Noise VRMS<3mV.
The gas collecting processing module 20 is by built-in corresponding gas sensor to several different types of gases
And VOCs（Volatile organic compounds, volatile organic matter）Gas carries out concentration acquisition and exports corresponding dense
Spend signal, concentration signal is amplified, is followed, filter after export be suitble to adc data acquire voltage signal（A kind of simulation letter
Number）.The concentration value of the voltage signal and gas is proportional, and gas concentration is bigger, and the voltage signal is bigger.The present embodiment
In, gas sensor includes but not limited to CO（Carbon monoxide）Sensor, SO2（Sulfur dioxide）Sensor, CO2（Carbon dioxide）
Sensor, O3（Ozone）Sensor, the corresponding gas sensor type of these four gas types include but not limited to that electrochemistry passes
Sensor.VOCs gases pass through VOCs sensors（Including but not limited to PID（Photo Ionization Detector）Sensor）
Acquisition.
Voltage signal is passed through the ADC of high-precision 24bit by the data processing module 30（Analog-to-Digital
Converter）Be converted into digital signal, further according to acquisition ambient temperature and humidity to digital signal carry out temperature and humidity compensation after obtain
Concentration values communication is uploaded to monitoring host computer or cloud platform is shown, forms surrounding air by the actual concentration values of corresponding gas
Quality-monitoring station, to realize the monitoring of air quality.Wherein, ambient temperature and humidity is acquired by onboard Temperature Humidity Sensor, can be with
The humiture variation of each working sensor environment is monitored in real time.Communication mode includes that Internet of Things Network Communication and existing tradition are logical
Letter.Several different types of interface of internet of things are reserved with, Internet of Things module, including LoRa can be accessed according to actual demand
（One kind in the LPWAN communication technologys, a kind of overlength distance wireless transmission scheme based on spread spectrum）,Zigbee（It is a kind of close
Distance, low complex degree, low-power consumption, low rate, the bidirectional wireless communication technology of low cost）,WiFi（Electronic equipment is allowed to be connected to
One WLAN（WLAN）Technology）,GPRS（General Packet Radio Service, general grouped wireless clothes
Business technology）,GSM（Global System for Mobile Communication, global system for mobile communications）,3G（Third
Third-generation mobile communication technology）,4G（Forth generation mechanics of communication）Etc. modules.Traditional communication function includes RS485 patterns and communication protocol
Meet Modbus RTU patterns（It is correspondingly arranged RS485 communication interfaces and Modbus interfaces）, the own system of user's access can be facilitated
System or PLC（Programmable logic controller (PLC)）,DCS（Dcs）Equal integrated systems.
In further embodiment, the air-quality monitoring system further includes memory module 40, for store product information,
Parameter and the calibration parameter of dispatching from the factory and other and the relevant parameter of product.Parameter of dispatching from the factory includes producer's manufacturing parameter, sequence of modules
Number, sensor sequence number, module running parameter, sensor detection zero and span and producer module be arranged other join
Number.
In further embodiment, the air-quality monitoring system further includes by interactive interface J0（As shown in Figure 2）,LCD
The human-computer interaction module 50 of liquid crystal display and four buttons composition.The LCD liquid crystal display screen and four buttons pass through interaction
Interface J0 is connect with data processing module 30, and interactive interface J0 is pressed as between LCD liquid crystal display screen and data processing module 30
Data interaction access between key and data processing module 30；Carried out data transmission using IIC communications.LCD liquid crystal display screen is used
In display real-time gas concentration, operation interface is provided, user is facilitated to carry out modular calibration, also facilitate producer's scheduling and planning.Four are pressed
Key is for inputting corresponding key value directly to carry out the selection or adjustment of parameter.
Please be one with continued reference to Fig. 1, in the present embodiment, the power module 10 includes input processing circuit 110, power supply circuit
120, DC power supply circuit 130, probe power circuit 140 and VOCs probe powers circuit 150.The input processing circuit
Decompression is supply voltage after 110 pairs of input voltages carry out EMI filtering.Supply voltage decompression is first voltage by power supply circuit 120
It powers for data processing module 30.The DC voltage that supply voltage decompression is 5V is carried out 5V power supplies by DC power supply circuit 130.Institute
It is that gas collecting processing module 20 is powered that probe power circuit 140, which is stated, by the second voltage that supply voltage decompression is 6V, also right
Second voltage lowering and stabilizing blood pressure is the reference voltage of 2.5V and exports to gas collecting processing module 20.VOCs probe power circuits
150 by supply voltage decompression be PID voltages be VOCs sensors power.
Also referring to Fig. 2, the data processing module 30 include microcontroller U1, first interface J1, first resistor R1,
Second resistance R2,3rd resistor R3, the 4th resistance R4, the first capacitance C1, the second capacitance C2 and third capacitance C3；Described first connects
The 1st foot of the 2nd foot connection microcontroller U1 of mouthful J1 is also grounded by second resistance R2；The 3rd foot connection of first interface J1 is micro-
The 2nd foot of controller U1 is also grounded by 3rd resistor R3；One end of the 4th foot connection first resistor R1 of first interface J1, the
One end of one capacitance C1 and the RST feet of microcontroller U1, the 5th foot of first interface J1 and the other end of first resistor R1 are all connected with
The 1st foot of feeder ear VCC-MCU, first interface J1 and the other end of the first capacitance C1 are grounded, the P2.5 feet of microcontroller U1
Connect the first crystal oscillator Y1（Low speed crystal oscillator）The 1st foot, third capacitance C3 one end and the 4th resistance R4 one end；Microcontroller U1
P2.4 feet connect the 2nd foot of the first crystal oscillator Y1, the second capacitance C2 one end and the 4th resistance R4 the other end；First crystal oscillator Y1
The 3rd foot, the other end of the second capacitance C2 and the other end of third capacitance C3 be grounded；AIO0 feet, the AIO1 of microcontroller U1
Foot, AIO2 feet, AIO3 feet, P3.2 feet, P3.3 feet, P3.4 feet, P3.5 feet are all connected with gas collecting processing module 20；Microcontroller
The COM0 feet of U1, COM1 feet, COM2 feet, COM3 feet, P10.2 feet, P10.3 feet, P6.0 feet, P6.1 feet, P6.2 feet, P6.3 feet,
P6.4 feet, P6.5 feet, P6.6 feet, P6.7 feet respectively with the 2nd foot of interactive interface J0, the 1st foot, the 4th foot, the 3rd foot, the 6th foot,
5 feet, the 8th foot, the 7th foot, the 10th foot, the 9th foot, the 12nd foot, the 11st foot, the 14th foot, the 13rd one-to-one connection of foot.
In the present embodiment, the microcontroller U1 has been internally integrated 8 channel 24bitADC.Wherein, the microcontroller
Pin1（1st foot）And Pin2（2nd foot）To debug foot, with first interface J1（Debugging interface）Connection, by first interface J1 outside
Debugger is connect to carry out scheduling and planning.Pin4（RST feet）For reset pin, pass through first resistor R1 and the second capacitance C2 when powering on
Generate reset signal. Pin15（P2.7 feet）And Pin16（P2.6）For external crystal-controlled oscillation pin, the frequency of external low speed crystal oscillator Y1
Range is 4Mhz-16MHz.It in the specific implementation can also be in advance by the second crystal oscillator Y2（High speed crystal oscillator）And its peripheral circuit（Two
Capacitance and a resistance, structure are identical as the first crystal oscillator Y1）On circuit boards, the frequency of the second crystal oscillator Y2 is 32768Hz for setting,
Corresponding pin can be connect with microcontroller U1 as needed in designing production process, to select high speed crystal oscillator or low
Fast crystal oscillator.Pin39~Pin42（AIO3 feet ~ AIO0 feet）,Pin45~Pin48（P3.5 feet ~ P3.2 feet）It, should for ADC input pins
ADC input pins are complete differential inputs, and the positive input and negative input of ADC can be arranged by program；Gas collecting
The signal that processing module 20 acquires corresponding gas sensor exports corresponding voltage signal after handling（AI0~AI7）Directly
It connected the ADC pins and carries out adc data acquisition.The voltage signal of VOCs sensors output passes through P1.6 feet and P1.7 feet
（PID_TX,PID_RX）It is transferred to microcontroller U1.Microcontroller U1 exports enable signal PID_EN controls by P1.5 feet
Whether VOCs sensors work, and enable signal PID_EN is that high level then controls VOCs normal operation of sensor, then for low level
Forbid VOCs working sensors.COM0 ~ COM3 indicates that the com port of LCD short in size screen liquid crystal displays, SEG0 ~ SEG9 expressions are transmitted to
The display signal of LCD liquid crystal display screen, wherein COM0 ~ COM9 can also be used as general GPIO pin, if selection IIC or
Directly select suitable pin access that can also realize what data were shown from SEG0 ~ SEG9 if the LCD liquid crystal of SPI communication mode
Purpose.
In further embodiment, the data processing module 30 further includes the first indicator light D1, the second indicator light D2, the 5th
Resistance R5 and the 6th resistance R6；The P10.0 feet of the microcontroller U1 by the 5th resistance R5 the first indicator lights of connection D1 just
The P10.1 feet of pole, microcontroller U1 pass through the anode of the 6th resistance R6 the second indicator lights of connection D2, the cathode of the first indicator light D1
Connect the cathode and ground of the second indicator light D2.First indicator light D1 and the second indicator light D2 is system running indicator, according to setting
Meter research and development need, this two LED indicator light can also be connected on other pins of microcontroller.
Pin8（VDD feet）For the power input pin of microcontroller U1, power input range is DC2.2V-DC3.6V；
The capacitance of one 10uF, the VDD feet and feeder ear VCC- of one end connection microcontroller U1 of the capacitance can be set in the specific implementation
MCU, the other end ground connection of the capacitance.Power supply is set more to stablize by capacitor filtering.The capacitance and the 10uF of one 1uF can be also set
Capacitance parallel connection to increase filter effect.
It is to be appreciated that the present embodiment selection is the microcontroller for being internally integrated 24bitADC, in the specific implementation
This microcontroller can be detached, external 24bit or 16bitADC is selected to be redesigned.The microcontroller U1's
P9.6 feet, P9.7 feet external resistance and capacitance are selected as standby functions, can select to weld or do not weld according to actual needs
It connects.
It is separately positioned, gas collecting processing module 20 based on gas collecting processing module 20 and data processing module 30
There may be external disturbances for the voltage signal of output, smooth in order to make the voltage signal of input more stablize, and can also be arranged by electricity
The voltage signal that the filter circuit 210 of resistance and capacitance composition exports gas collecting processing module 20 is filtered, such as Fig. 2
Shown in Fig. 3, each voltage signal（AIO0~AIO7）Pass through a filter circuit respectively（Structure is identical as 210）After filtering with it is micro-
Corresponding pin connection on controller U1.
Also referring to Fig. 4, the memory module 40 includes memory U2（EEPROM or FLASH storage cores can be used
Piece）, the 7th resistance R7, the 8th resistance R8, the 4th capacitance C4 and magnetic bead FB；The VCC feet of the memory U2 connect the 4th capacitance
One end of C4 also passes through magnetic bead FB connection power ends D_3.3V；The WP feet of memory U2 connect the 4th capacitance C4 the other end and
Ground, the P2.0 feet of the SCL feet connection microcontroller U1 of memory U2 also pass through the 7th resistance R7 connection power ends D_3.3V；It deposits
The P2.1 feet of the SDA feet connection microcontroller U1 of reservoir U2 also pass through the 8th resistance R8 connection power ends D_3.3V.Memory U2
The storage and reading for carrying out data are communicated using IIC between microcontroller.
Based on above-mentioned air-quality monitoring system, the embodiment of the present invention correspondingly provides a kind of air-quality monitoring system
Monitoring method, referring to Fig. 5, the monitoring method includes the following steps：
Several voltages are exported after S100, the conversion of electric power source pair of module input voltage progress direct current, lowering and stabilizing blood pressure to be powered；
S200, gas collecting processing module are by built-in gas sensor to several different types of gases and VOCs gases
Carry out concentration acquisition simultaneously export corresponding concentration signal, concentration signal is amplified, is followed, filter after export corresponding voltage
Signal；
Voltage signal is converted into digital signal by S300, data processing module, and is believed number according to the ambient temperature and humidity of acquisition
The concentration values of corresponding gas are obtained after number carrying out temperature and humidity compensation, concentration values are passed through into RS485 communication outputs.
In conclusion air-quality monitoring system provided by the invention and its monitoring method, by multiple gases sensor（This
Place is four electrochemical gas sensors and a VOCs sensor）It is integrated together, in addition to routine AQI can be carried out（Air
Quality Index, air quality index）Outside gas-monitoring, the concentration of VCOs gases can be also monitored, range can be surveyed by increasing,
Abundanter data basis is provided for air quality monitoring.It is converted by high-precision ADC, PPB can be monitored（Minus the 6 of 10
Power is equivalent to Gamma Magnitude）The gas concentration of rank can more accurately measure gas concentration.Pass through temperature and humidity compensation energy
Reduce influence of the humiture variation to gas sensor detection data.Enable air-quality monitoring system by communication transmitting data
It more easily uses on various Multi-parameter gas detectors or quality of air environment monitoring station or pertinent instruments, to realize
The a wide range of transmission of gas concentration value.
The division of above-mentioned function module, can be as needed by above-mentioned function only to for example, in practical applications
Distribution is completed by different function modules, that is, different function modules is divided into, to complete all or part of foregoing description
Function.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement should all belong to the guarantor of appended claims of the invention
Protect range.
Claims (8)
1. a kind of air-quality monitoring system, which is characterized in that including：Power module, gas collecting processing module, data processing
Module and memory module；
Several voltages are exported after the electric power source pair of module input voltage progress direct current conversion, lowering and stabilizing blood pressure to be powered；Gas
Acquisition processing module carries out concentration acquisition by built-in gas sensor to several different types of gases and VOCs gases
And export corresponding concentration signal, concentration signal is amplified, is followed, filter after export corresponding voltage signal；At data
Voltage signal is converted into digital signal by reason module, and carries out temperature and humidity compensation to digital signal according to the ambient temperature and humidity of acquisition
Concentration values are communicated by RS485 and are exported by the concentration values for obtaining corresponding gas afterwards；The memory module is for storing product
Information, manufacture parameter and calibration parameter.
2. air-quality monitoring system according to claim 1, which is characterized in that the power module includes input processing
Circuit, power supply circuit, DC power supply circuit, probe power circuit and VOCs probe power circuits：
Decompression is supply voltage after the input processing circuit carries out EMI filtering to input voltage；
It is data processing module power supply that supply voltage decompression is first voltage by the power supply circuit；
The DC voltage that supply voltage decompression is 5V is carried out 5V power supplies by the DC power supply circuit；
The second voltage that supply voltage decompression is 6V is the power supply of gas collecting processing module by the probe power circuit, also right
Second voltage lowering and stabilizing blood pressure is the reference voltage of 2.5V and exports to gas collecting processing module；
It is the power supply of VOCs sensors that supply voltage decompression is PID voltages by the VOCs probe powers circuit.
3. air-quality monitoring system according to claim 1, which is characterized in that further include by interactive interface, LCD liquid crystal
The human-computer interaction module of display screen and several buttons composition；LCD liquid crystal display screen and several buttons by interactive interface with
Data processing module connects；
The interactive interface is used between LCD liquid crystal display screen and data processing module, between button and data processing module
Data interaction；LCD liquid crystal display screen provides operation interface and carries out modular calibration and tune for showing real-time gas concentration
Examination；Several buttons are for inputting corresponding key value to carry out the selection or adjustment of parameter.
4. air-quality monitoring system according to claim 3, which is characterized in that the data processing module includes micro-control
Device, first interface, first resistor, second resistance, 3rd resistor, the 4th resistance, the first capacitance, the second capacitance and third electricity processed
Hold；
1st foot of the 2nd foot connection microcontroller of the first interface is also grounded by second resistance；3rd foot of first interface
It connects the 2nd foot of microcontroller, be also grounded by 3rd resistor；One end of the 4th foot connection first resistor of first interface, first
One end of capacitance and the RST feet of microcontroller, the 5th foot of first interface and the other end of first resistor are all connected with feeder ear, the
1st foot of one interface and the other end of the first capacitance are grounded, and the P2.5 feet of microcontroller connect the 1st foot of the first crystal oscillator, the
One end of one end of three capacitances and the 4th resistance；2nd foot of P2.4 feet the first crystal oscillator of connection of microcontroller, the one of the second capacitance
The other end at end and the 4th resistance；The 3rd foot, the other end of the second capacitance and the other end of third capacitance of first crystal oscillator connect
Ground；AIO0 feet, AIO1 feet, AIO2 feet, AIO3 feet, P3.2 feet, P3.3 feet, P3.4 feet, the P3.5 feet of microcontroller are all connected with gas
Body acquisition processing module；The COM0 feet of microcontroller, COM1 feet, COM2 feet, COM3 feet, P10.2 feet, P10.3 feet, P6.0 feet,
P6.1 feet, P6.2 feet, P6.3 feet, P6.4 feet, P6.5 feet, P6.6 feet, P6.7 feet respectively with the 2nd foot of interactive interface, the 1st foot,
4th foot, the 3rd foot, the 6th foot, the 5th foot, the 8th foot, the 7th foot, the 10th foot, the 9th foot, the 12nd foot, the 11st foot, the 14th foot, the 13rd foot
One-to-one connection.
5. air-quality monitoring system according to claim 4, which is characterized in that the data processing module further includes
One indicator light, the second indicator light, the 5th resistance and the 6th resistance；
The P10.0 feet of the microcontroller connect the anode of the first indicator light by the 5th resistance, and the P10.1 feet of microcontroller are logical
The anode that the 6th resistance connects the second indicator light is crossed, the cathode of the first indicator light connects the cathode and ground of the second indicator light.
6. air-quality monitoring system according to claim 5, which is characterized in that the memory module include memory,
7th resistance, the 8th resistance, the 4th capacitance and magnetic bead；
The VCC feet of the memory connect one end of the 4th capacitance, also by magnetic bead connect power end；The WP feet of memory connect
The other end and ground of 4th capacitance, the P2.0 feet of the SCL feet connection microcontroller of memory also pass through the 7th resistance connection power supply
End；The P2.1 feet of the SDA feet connection microcontroller of memory also pass through the 8th resistance connection power end.
7. air-quality monitoring system according to claim 1, which is characterized in that the gas sensor includes an oxidation
Carbon sensor, SO 2 sensor, carbon dioxide sensor, ozone sensor and VOCs sensors.
8. a kind of monitoring method using air-quality monitoring system described in claim 1, which is characterized in that including：
A, several voltages are exported after the conversion of electric power source pair of module input voltage progress direct current, lowering and stabilizing blood pressure to be powered；
B, gas collecting processing module by built-in gas sensor to several different types of gases and VOCs gases into
Row concentration acquires and exports corresponding concentration signal, concentration signal is amplified, is followed, filter after export corresponding voltage letter
Number；
C, voltage signal is converted into digital signal by data processing module, and according to the ambient temperature and humidity of acquisition to digital signal into
Concentration values are communicated by RS485 and are exported by the concentration values that corresponding gas is obtained after row temperature and humidity compensation.
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