CN206540801U - A kind of easy air quality PM2.5 Concentration Testing instruments - Google Patents
A kind of easy air quality PM2.5 Concentration Testing instruments Download PDFInfo
- Publication number
- CN206540801U CN206540801U CN201720239049.1U CN201720239049U CN206540801U CN 206540801 U CN206540801 U CN 206540801U CN 201720239049 U CN201720239049 U CN 201720239049U CN 206540801 U CN206540801 U CN 206540801U
- Authority
- CN
- China
- Prior art keywords
- chip microcomputer
- dust
- model
- air quality
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model discloses a kind of easy air quality PM2.5 Concentration Testing instruments, it is made up of single-chip microcomputer, input through keyboard module, reset circuit, dust sensor, A/D conversions, warning circuit and display module, by being combined using both single-chip microcomputer and sensor so as to realize.Detected by sensor, in real time monitoring dust in air concentration, a warning is played a part of by buzzer warning.The dust detector principle is simple, the dust of high concentration can be measured, dust content in testing conditions can be tested, the extensive use in public health, safety epidemic prevention, work production, industrial and mineral field, it is also pollution surveys, the Main Means of air quality surveillance, is that the development of environmental protection tests work creates advantage.
Description
Technical field
The utility model is related to a kind of air detecting device, more particularly to a kind of easy air quality PM2.5 concentration inspection
Survey instrument.
Background technology
As the people with rapid changepl. never-ending changes and improvements of community organization are to the concern improved the quality of living also more and more higher, but also because economical
The various problem of environmental pollutions that are brought of development it is also increasingly serious.Prior art is numerous for the device category of Detection of Air Quality
It is many, in line with excelsior spirit, it is necessary to constantly improve and innovation.
Utility model content
The purpose of this utility model is that to provide a kind of easy air quality PM2.5 to solve the above problems dense
Spend detecting instrument.
The utility model is achieved through the following technical solutions above-mentioned purpose：
The utility model is by single-chip microcomputer, input through keyboard module, reset circuit, dust sensor, A/D conversions, warning circuit
With display module composition, the input through keyboard module is connected with the input of the single-chip microcomputer, the reset circuit and the list
The reset circuit end connection of piece machine, the signal output part of the dust sensor is changed and the single-chip microcomputer by the A/D
Dust signal acquisition terminal is connected, and the control output end of the single-chip microcomputer is connected with the signal input part of the dust sensor, institute
The alarm signal output ends for stating single-chip microcomputer are connected with the warning circuit, and the display signal output part of the single-chip microcomputer shows with described
Show that module is connected.
Specifically, the model STC89C52 minimum systems of the single-chip microcomputer.The dust sensor is model
GP2Yl010AUOF optical sensor.The model ADC0832 of the A/D conversions.The display module is model LCD1602
LCDs.
The beneficial effects of the utility model are：
The utility model is a kind of easy air quality PM2.5 Concentration Testing instruments, compared with prior art, this practicality
It is new to be combined to realize by application both single-chip microcomputer and sensor.Detected by sensor, in real time powder in monitoring air
Dust concentration, after more than desired value set in advance, a warning is played a part of by buzzer warning.Using
The dust detector of STC89C52 models, the typing of data can be carried out by keyboard, reference value is rationally set, passed through
Dust sensor enters the collection and detection of row information, is analyzed and handled using dust detector, and testing result is shown
On LCDs.The dust detector principle is simple, and the dust of high concentration can be measured, can be to testing conditions
In dust content tested, be also pollution in public health, safety epidemic prevention, work production, extensive use in industrial and mineral field
Investigation, the Main Means of air quality surveillance, are that the development of environmental protection tests work creates advantage.
Brief description of the drawings
Fig. 1 is system architecture diagram of the present utility model；
Fig. 2 is single chip part connection circuit diagram of the present utility model；
Fig. 3 is single-chip microcomputer pinouts of the present utility model；
Fig. 4 is the circuit connection diagram of dust sensor of the present utility model；
Fig. 5 is the pinouts of dust sensor of the present utility model；
Fig. 6 is the pinouts of A/D conversions of the present utility model；
Fig. 7 is display module circuit diagram of the present utility model；
Fig. 8 is the circuit diagram of warning circuit of the present utility model；
Fig. 9 is power supply circuit of the present utility model；
Figure 10 is workflow diagram of the present utility model；
Figure 11 is keyboard scan flow chart of the present utility model；
Figure 12 is interruption of work flow chart of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings：
As shown in Figure 1：The utility model is turned by single-chip microcomputer, input through keyboard module, reset circuit, dust sensor, A/D
Change, warning circuit and display module are constituted, the input through keyboard module is connected with the input of the single-chip microcomputer, described to reset electricity
Road is connected with the reset circuit end of the single-chip microcomputer, and the signal output part of the dust sensor is changed and institute by the A/D
The dust signal acquisition terminal connection of single-chip microcomputer is stated, the control output end of the single-chip microcomputer and the signal of the dust sensor are inputted
End connection, the alarm signal output ends of the single-chip microcomputer are connected with the warning circuit, the display signal output of the single-chip microcomputer
End is connected with the display module.Warning circuit, LCD are shown, reset circuit, input module, digital-to-analogue conversion, dust collection survey
Amount, single-chip microcomputer etc. together constitute the present invention.In the entire system, most basic structure is exactly single-chip microcomputer.PM2.5 detector energy
The content and concentration of particle enough in detection air.By D/A converting circuit, the analog information collected is converted into digital letter
Number.According to the information inputted in keyboard, alarming value is adjusted.Measured value and alarming value can be shown in LCD screen in real time
On., can automatic alert if measured data is higher than preset value.If actual test data are not higher than setting value, report
Alert circuit can be terminated, and automatically reset to reset condition.As shown in Figure 1.
Specifically, the model STC89C52 minimum systems of the single-chip microcomputer.The dust sensor is model
GP2Yl010AUOF optical sensor.The model ADC0832 of the A/D conversions.The display module is model LCD1602
LCDs.
Systemic-function
System is detected using the structure design PM2.5 dust of " dust sensor+alarm+display screen+button+single-chip microcomputer "
System.
The single-chip microcomputer of STC89C52 models is selected, digital-to-analogue conversion can be realized, convenience is provided for actual use.
The model GP2Y1010AUOF of dust sensor, can realize digital-to-analogue conversion, more convenient, fast.
Alarming value can be adjusted by button, provide convenient for actual use.
It is connected with AT24C02, power down protection can be realized.
If dust concentration is in preset value, it can be seen that air regime is all well and good.
If dust concentration is significantly larger than preset value, acoustic-optic alarm can automatic start
LCD1602 can be by presentation of information such as warning concentration, dust concentrations on a display screen, being capable of direct viewing.
Singlechip technology index：
Supply voltage：5-7V
Operating temperature：- 10-65 degrees Celsius
Consume electric current：20mA is maximum
Smallest particles detection value：0.8 micron
Sensitivity：0.5V/(0.1mg/m3)
Voltage in clean air：0.9V representative values
Operating temperature：- 10~65 DEG C
Storage temperature：- 20~80 DEG C
System Working Principle：
, can be according to dust measuring principle after turning on the power switch, the concentration information that measurement is obtained is converted to voltage signal,
Voltage range 0-5V.Using ADC0832 devices, binary data can be converted signals into, is 8bit, is input to single-chip microcomputer
It is interior.Handled, convert thereof into decimal data, be 3bit, LCD Panel is sent to by input-output modeling storehouse,
Specifying information can be shown on a display screen.
Simple detection dust instrument the Hardware Design：
Single chip part：
MCU is to possess complete set of system and be integrated on chip.Most of part that it possesses：CPU, inside are deposited
Storage, internal bus system and external bus system.By integration of equipments such as timer, clock, communication interfaces.SCM system can
A variety of functions such as integrated output, input, network, image, transfer voice, on a SCM system.Dust monitor
Key structure is exactly CPU, can be gathered, processing data, and result is included on screen, and guarantor is provided for the operation of instrument
The work activities of system can be brought and directly affected by barrier.As shown in Fig. 2 being STC89C52 circuit diagram, its antijamming capability
By force, power consumption consumption is few, and the speed of service is fast, efficiency high.
1. it is multi-functional I/O mouthfuls
STC89C52 has four input/output ports, accounts for 8：P0, P1, P2, P3 port, I/O lines have 32.Each
Line can complete to input and export.Its structure is as shown in Figure 3.
RST the RESET input mouthful.Occurs the height electricity of 2 high machine cycles when oscillator is run, in port pinout
It is flat.If WatchDog Timer overflows, the pin of single-chip microcomputer can be caused to shake.Address latch signal ALE/PROG.
When memory outside access, address will use output signal among latching low byte.At the time of programming, this
Pin can be transfused to PROG.Under the conditions of being somebody's turn to do, external definition is carried out by ALE, the frequency of oscillator carried out by 6 fractional frequency signals
Control.When can skip an ALE pulse and it can access every time to external data memory [5].If it is desired, SFR registers
The position of middle 8EH addresses can be changed into 1 from 0, so as to shield ALE work；This when ALE can just be activated must by MOVX or
MOVC instruction is performed.When the outside execution order in single-chip microcomputer, ALE positions 1 are shielded, are now not have completely.If
Enter the execution of line command on the outside of single-chip microcomputer, ALE directly can be set to 0.PSEN program storages being capable of input signal.Pass through letter
Number the code in memory is read out.They can be a machine cycle activation twice.Allow access outside EA/Vpp
Signal.EA is connected to reading and transmission that ground terminal carries out data, data are read in 0000H~FFFFH memory is in address
Take out.EA is connected to Vcc, now performs the program of inside.At this moment if memory is programmed, 12V is will turn on this port
Voltage.XTAL1 and XTAL2 is respectively the input and output for inverting amplifier.
2. reset circuit
Single-chip microcomputer can be reset to original state by reset circuit, and instruction is performed and started.It is single under the conditions of being somebody's turn to do
Piece machine accesses power supply, can obtain reset signal, starts single-chip microcomputer, allows it to keep normal working condition, and carried out to signal
Identification.After single-chip microcomputer access power supply, it can obtain reset signal, start single-chip microcomputer, allow its normal work, and signal is entered
Row identification and processing, allow single-chip microcomputer to bring into operation and work [6].Should under the conditions of, single-chip microcomputer can stable operation, it is outer due to existing
Boundary is disturbed, and problem and failure occurs in system.By reset circuit, single-chip microcomputer can be allowed to restPose, complete to appoint again
Business, and perform corresponding operating.
In whole single chip circuit, the content of most critical is exactly clock circuit, to the speed of service and efficiency of single-chip microcomputer
Manipulated, single-chip microcomputer is maintained at normal working condition.And clock circuit directly determines its speed of service and efficiency.
Air mass sensor (dust sensor)
GP2Yl010AUOF is a kind of optical sensor, and air quality, fraction of particle and concentration can be detected.
Wherein phototransistor is laid in side on the position of interior diagonal, and opposite side lays infrared diode.These devices
Residing diagonal position can detect the reflection light of particulate in air.Because air has circulation, anywhere can
Enough values to PM2.5 are measured, in the more excellent place of air ambient, resulting last accurately data.Such as Fig. 4
It is shown, it is typical circuit.Its pinouts is as shown in Figure 5.
Analog-to-digital conversion ADC0832
ADC0832 is D/A converting circuit, possesses 256 grades of high-resolution, and general requirement can be met completely.
So that chip reason between 0~5V analog voltages is the multiplexing and builtin voltage input of its reference voltage.Independent chip is defeated
Enter to make the more convenient of processor control change.Using DI ports, can input data, channel function is selected.Such as
It is chip pin figure shown in Fig. 6.
LCD MODULE
Single-chip microcomputer is collected after analog signal, is changed by calculation process, in LCDs out measurement shown above
The PM2.5 values arrived, circuit diagram is as shown in Figure 7.
LCD1602 is a kind of LCDs, is mainly used in industrial circle, is at best able to show 32 characters, size
For 2 rows, 16 row.LCDs is extremely common equipment, extensively should be obtained in the fields such as electronic device, instrument and meter
With.Wide hair application is obtained in home electronics, electronic watch, the display of figure, symbol and numeral can be carried out.Single-chip microcomputer is behaved
Machine interaction provides visualization interface, including liquid crystal display, LED charactrons, luminous tube etc..LED and luminous tube are set various
Standby middle extensive use.
Liquid crystal display is arranged in SCM system, the transmission of signal can be carried out, and with following features：It is first
First, signal is transmitted to liquid crystal display, it is possible to increase brightness and color saturation, externally luminous all the time, light stability will not go out
The phenomenon now flashed, display effect is better than CRT monitor.So, its picture effect is not in the effect of flicker more preferably
Really.Liquid crystal display is digital-code type display, be can be directly connected among SCM system, and data transfer is stable, reliability
High [7].The molecular state of liquid crystal display can be controlled using electrode, specific effect is shown on the display screen.Phase
Compared with traditional monitor, the volume of liquid crystal display is less, lighter in weight.Compared with other driving IC and electrode, liquid crystal display
Device energy resource consumption is relatively low.
According to the physical property of liquid crystal, numeral and figure are shown using LCDs, viewing area is controlled using voltage
And effect, can be by figure, text importing on screen.Liquid crystal display can show panchromatic color effect, can directly drive,
Integrated, small volume can be carried out to circuit.PAD, intelligent computer, mobile terminal, digital camera etc. generally use liquid crystal display
Screen.
Warning circuit
As shown in figure 8, being the circuit diagram of warning circuit.Alarm sound is sent by buzzer.
Power supply circuit
Power supply is provided for power module, DC voltage can be obtained, voltage amplitude is 5 volts.Made by DI light emitting diodes
For power supply warning light, current-limiting resistance is as shown in R8.As shown in figure 9, being circuit diagram.
Workflow：
System includes the modules such as display, PM2.5 calculating, digital-to-analogue conversion, driving sensor, initialization.In systems, each mould
Block occupies extremely important status.It is capable of the work of control single chip computer using software, PM2.5 numerical value is measured, calculated
And display.As shown in Figure 10.
The keyboard to set up of concentration reference value
Due to the dust containing variety classes, diameter and concentration in air, there is some difference for dust amount of flow.So,
In actual environment, the Dust Capacity sucked in mankind's activity also has different.Therefore, environment is changed, to dust
Concentration value is rationally set, and dust concentration peak is rationally set, by the way that dust detector is to dust concentration and contains
Amount is detected [8] that prompting worker handles the problem of dust content is too high in time, scene is withdrawn immediately, and take effective hand
Section reduces dust.
This module using Independent keys by reference information by input through keyboard to system, using single-chip microcomputer to reference value and
Data are contrasted, and the working condition to buzzer is adjusted.In addition, allowing hand over concentration and reference using Independent keys
Value, realizes the conversion of display effect.
The design of keyboard scan
The CPU of SCM system will be scanned to keyboard, obtain input data., can't when practical operation and processing
Consume the substantial amounts of time.So, CPU working condition is combined, using the keyboard that performance is stable.The CPU usage of the system
It is relatively low, therefore keyboard scan is completed by programming, it disclosure satisfy that actual demand.
The function of keyboard scan program：
(a) state to each button in keyboard is scanned.Entered information into by keyboard in circuit, if being all
" 1 ", then represent not pushing button.If part button is " 0 ", means that and press some button.
(b) interference for avoiding shake from being brought to button.Key-press status is judged, if pressing some button,
The time of software 10 milliseconds of automatically delaying of meeting, keyboard state is judged.Assuming that pressing some button, then this can be handled
The jitter conditions of button.Discharge after keyboard, software can also postpone the corresponding time.Assuming that button is in release conditions.Then represent
This button is released.
(c) key position is calculated.Each button is scanned, the position of button is determined.As shown in figure 11.
The program of signal acquisition
It is consecutive variations because the measurement result of dust concentration is analog signal.Can be to ring using dust collector
Dust concentration in border is detected, the testing result of the dust concentration of simulation is transformed into analog signal using signal amplifier
[10], processing is amplified to signal using amplifier, magnitude of voltage is 0~5V.
Interruption of work flow
During actual motion, in the event of problem and failure, the appearance of new problem can be caused, to be solved by CPU.
CPU can allow other programs to be suspended, and open new task.Terminate old task, open the activity as terminal of new task.
It is that sensor is driven and controlled by timer terminal.The working condition of timer is arranged to 1, in unlatching
Having no progeny can assignment again.As shown in figure 12, it is the flow chart of the system.
Analysis of experimental results
By learning and studying, a Dust Testing Instrument is devised., be according to its work(when carrying out the design of Dust Testing Instrument
Energy and principle, design circuit diagram, each module of system are analyzed and studied, and are shown by LCD, signal is changed and collection mould
Block, realizes the collection of signal.According to circuit diagram, enter writing for line code, whether simulation speed-up design is reasonable.
The Dust Testing Instrument designed herein is simple in construction there is provided visualization interface, and developing prospect is wide.Setting
When counting circuit, it is impossible to ignore the effect of subjective initiative, grasp more refers to and technical ability.
The various functions and index of comprehensive test system, gather particle and dust concentration information by sensor, do immediately
Go out reaction, shorten the stand-by period as far as possible.Can externally it be sent when the analog signal that single-chip microcomputer collects calculation process reaches reference value
Alarm sound, stability, reliability are significantly improved.Digital analog converter is 12, with up to 3.3V/4096=0.000's
Resolution ratio, i.e. 0.8mV.Data can be made complete, effective, measurement Jiangdu is also significantly improved.
Conclusion
Passed through the emulation of final hardware and software, simulation and modulated, reached target, achieve it is significant into
Really.
By gathering dust granules concentration, PM2.5 numerical value is calculated, measurement result is shown on the display screen,
Circuit structure is simple, cheap, with higher accuracy and the degree of accuracy, 1ug/m3, it is easy to use and operation.
In design, various problems are analyzed comprehensively, corresponding function is devised as the case may be.In an experiment repeatedly
Checking, with higher stability and reliability, cost performance is higher, with stronger control ability, is truly realized to monitoring
The real-time understanding and control at scene.
General principle of the present utility model and principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply illustrate principle of the present utility model, on the premise of the utility model spirit and scope are not departed from, the utility model is also
Various changes and modifications are had, these changes and improvements are both fallen within the range of claimed the utility model.The utility model
Claimed scope is by appended claims and its equivalent thereof.
Claims (5)
1. a kind of easy air quality PM2.5 Concentration Testing instruments, it is characterised in that：By single-chip microcomputer, input through keyboard module, answer
Position circuit, dust sensor, A/D conversions, warning circuit and display module composition, the input through keyboard module and the single-chip microcomputer
Input connection, the reset circuit is connected with the reset circuit end of the single-chip microcomputer, and the signal of the dust sensor is defeated
Go out end by the A/D conversion be connected with the dust signal acquisition terminal of the single-chip microcomputer, the control output end of the single-chip microcomputer and
The signal input part connection of the dust sensor, the alarm signal output ends of the single-chip microcomputer are connected with the warning circuit,
The display signal output part of the single-chip microcomputer is connected with the display module.
2. easy air quality PM2.5 Concentration Testing instruments according to claim 1, it is characterised in that：The monolithic
The model STC89C52 minimum systems of machine.
3. easy air quality PM2.5 Concentration Testing instruments according to claim 1, it is characterised in that：The dust
Sensor is model GP2Yl010AUOF optical sensor.
4. easy air quality PM2.5 Concentration Testing instruments according to claim 1, it is characterised in that：The A/D turns
The model ADC0832 changed.
5. easy air quality PM2.5 Concentration Testing instruments according to claim 1, it is characterised in that：The display
Module is model LCD1602 LCDs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720239049.1U CN206540801U (en) | 2017-03-13 | 2017-03-13 | A kind of easy air quality PM2.5 Concentration Testing instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720239049.1U CN206540801U (en) | 2017-03-13 | 2017-03-13 | A kind of easy air quality PM2.5 Concentration Testing instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206540801U true CN206540801U (en) | 2017-10-03 |
Family
ID=59941819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720239049.1U Expired - Fee Related CN206540801U (en) | 2017-03-13 | 2017-03-13 | A kind of easy air quality PM2.5 Concentration Testing instruments |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206540801U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257173A (en) * | 2020-02-20 | 2020-06-09 | 浙江农林大学 | Two-box multi-air-source integrated PM2.5 simulation device |
| CN114019421A (en) * | 2021-11-24 | 2022-02-08 | 珠海斯巴克电子设备有限公司 | Multifunctional signal line testing device and testing method thereof |
-
2017
- 2017-03-13 CN CN201720239049.1U patent/CN206540801U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111257173A (en) * | 2020-02-20 | 2020-06-09 | 浙江农林大学 | Two-box multi-air-source integrated PM2.5 simulation device |
| CN114019421A (en) * | 2021-11-24 | 2022-02-08 | 珠海斯巴克电子设备有限公司 | Multifunctional signal line testing device and testing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101881790A (en) | Intelligent electric power parameter tester | |
| CN201867812U (en) | Equipment point-detecting instrument | |
| CN206540801U (en) | A kind of easy air quality PM2.5 Concentration Testing instruments | |
| CN105241504A (en) | Distributed indoor environment quality detection system | |
| CN110658241A (en) | Multiple gas detection device | |
| CN108760989A (en) | A kind of air-quality monitoring system and its monitoring method | |
| CN205228803U (en) | Isolator state test device | |
| CN102435555A (en) | Multispectral water quality analyzer | |
| CN202256140U (en) | Multispectral water quality analyzer | |
| CN201795814U (en) | Integrated temperature and humidity monitoring device | |
| CN103344434A (en) | LabVIEW-based automotive engine parameter detection system | |
| CN203673087U (en) | Meteorological data measuring device | |
| CN107991943A (en) | A kind of parameter tester of portable type solar energy electricity generation system | |
| CN205066815U (en) | Indoor environmental quality detecting system of distributing type | |
| CN202885966U (en) | Spot inspection instrument | |
| Zhao et al. | Design and implementation of portable sensory system for air pollution monitoring monitoring | |
| CN208156537U (en) | A kind of pm2.5 and temperature and humidity multifunction monitoring system based on OneNet cloud platform | |
| CN207675600U (en) | A kind of intelligence high-precision dust sensor | |
| CN202305458U (en) | Air quality detecting device | |
| CN202216899U (en) | Multifunctional food safety detector | |
| CN208187447U (en) | A kind of pipeline gas parameter measuring instrument | |
| CN211978749U (en) | Multiple gas detection device | |
| CN107883619A (en) | A kind of small refrigerant recycling machine TT＆C system and method | |
| CN201514435U (en) | Electric power parameter meter | |
| CN207335761U (en) | Home environment intelligent detection device based on FPGA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171003 Termination date: 20180313 |