CN106442242A - Sampling circuit of air quality detection instrument - Google Patents
Sampling circuit of air quality detection instrument Download PDFInfo
- Publication number
- CN106442242A CN106442242A CN201610817780.8A CN201610817780A CN106442242A CN 106442242 A CN106442242 A CN 106442242A CN 201610817780 A CN201610817780 A CN 201610817780A CN 106442242 A CN106442242 A CN 106442242A
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- CN
- China
- Prior art keywords
- pin
- dust sensor
- sampling
- msp
- chip
- 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.)
- Pending
Links
- 238000005070 sampling Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title abstract 2
- 239000000428 dust Substances 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 238000002513 implantation Methods 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0656—Investigating concentration of particle suspensions using electric, e.g. electrostatic methods or magnetic methods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0096—Investigating consistence of powders, dustability, dustiness
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention relates to a sampling circuit of an air quality detection instrument. The sampling circuit comprises a dust sensor GP and a sampling chip MSP, wherein a sixth lead pin of the dust sensor GP is connected with an external 5V power supply, and is connected with a first lead pin of the dust sensor GP through a resistor R1; the first lead pin of the dust sensor GP is connected with a positive electrode of a polar capacitor C1; a negative electrode of the polar capacitor C1 is connected with a second lead pin of the dust sensor GP; the second lead pin and the fourth lead pin of the dust sensor GP are grounded together; the third lead pin of the dust sensor GP is connected with a collecting electrode of a triode Q1; an emitting electrode of the triode Q1 is grounded; a base electrode of the triode Q1 is connected to a seventeenth lead pin of the sampling chip MSP through a second resistor R2. The sampling circuit has the advantages that the design is simple; the implantation is easy; through the structure change, the sampling precision of the sampling circuit is high; the tracking speed is high.
Description
Technical field
The present invention relates to a kind of sample circuit of air quality detector, belong to electric and electronic technical field.
Background technology
Recently as modernization and industrialized process, China's State of Air pollution is extremely serious, mainly assumes coal smoke
Type contamination characteristics, in city atmospheric environment, total suspended particles concentration is generally exceeded, sulfur dioxide pollution is maintained at higher level, machine
Motor-car exhaust pollutant total emission volumn increases sharply, nitrogen oxides pollution trend increases, the whole nation forms multiple Acid Rain Zones etc., harm
Ecological environment, impact body health of people.Also increasingly pay close attention to the body of itself however as growth in the living standard people
Body health, especially in the developing china family that air pollution is increasingly serious；
There is the inadequate accurately problem of sampling it would be highly desirable to solve in the sample circuit of existing air quality detector.
Content of the invention
The technical problem to be solved in the present invention is：For overcoming the problems referred to above, provide a kind of sampling accuracy rate high air matter
The sample circuit of amount detector.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of sample circuit of air quality detector, including dust sensor GP and sampling A/D chip MSP, described dust sensor
6th pin of GP connects external 5V power supply, and the first pin by the resistance R1 described dust sensor GP of connection, described powder
First pin of dust sensor GP is connected with the positive pole of polar capacitor C1, and the negative pole of described polarized electric capacity C1 connects described dust
The second pin of sensor GP, the second pin of described dust sensor GP is grounded together with the 4th pin, described dust sensing
The colelctor electrode of the 3rd pin connecting triode Q1 of device GP, the grounded emitter of described triode Q1, the base of described triode Q1
Pole is connected to the 17th pin of described sampling A/D chip MSP by resistance R2, and the 5th pin of described dust sensor GP passes through
Resistance R3 is connected to the 7th pin of described sampling A/D chip MSP, and the 7th pin of described sampling A/D chip MSP is also connected with resistance R4's
One end, the other end of described resistance R4 is connected with the first pin of described sampling A/D chip MSP, the 4th pin and the 8th pin respectively
And be grounded, the 5th pin of described sampling A/D chip MSP and the 48th pin connect external 3V power supply.
Preferably, the resistance value of described resistance R1 is 150 ohm.
The invention has the beneficial effects as follows：Circuit design of the present invention is simple, makes sample circuit by the change of structure
Sampling precision is high, and tracking velocity is fast.
Brief description
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the circuit diagram of one embodiment of the invention.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only with
Illustration illustrates the basic structure of the present invention, and therefore it only shows the composition relevant with the present invention.
Embodiment 1
The sample circuit of of the present invention a kind of air quality detector as shown in Figure 1, including dust sensor GP and sampling
6th pin of chip MSP, described dust sensor GP connects external 5V power supply, and connects described dust sensing by resistance R1
First pin of device GP, first pin of described dust sensor GP is connected with the positive pole of polar capacitor C1, described polarized electricity
The negative pole holding C1 connects the second pin of described dust sensor GP, the second pin of described dust sensor GP and the 4th pin
It is grounded together, the colelctor electrode of the 3rd pin connecting triode Q1 of described dust sensor GP, the emitter stage of described triode Q1
Ground connection, the base stage of described triode Q1 is connected to the 17th pin of described sampling A/D chip MSP by resistance R2, and described dust passes
5th pin of sensor GP is connected to the 7th pin of described sampling A/D chip MSP by resistance R3, and the of described sampling A/D chip MSP
Seven pins are also connected with one end of resistance R4, the other end of described resistance R4 respectively with the first pin of described sampling A/D chip MSP,
Four pins and the 8th pin connect and are grounded, and the 5th pin of described sampling A/D chip MSP and the 48th pin connect external 3V
Power supply.
Circuit design of the present invention is simple, makes sampling circuit samples high precision, tracking velocity by the change of structure
Hurry up.
In a preferred embodiment, the resistance value of described resistance R1 is 150 ohm.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, relevant staff is complete
Entirely various change and modification can be carried out in the range of without departing from this invention technological thought.The technology of this invention
The content that property scope is not limited on specification it is necessary to determine its technical scope according to right.
Claims (2)
1. a kind of sample circuit of air quality detector is it is characterised in that include dust sensor GP and sampling A/D chip MSP,
6th pin of described dust sensor GP connects external 5V power supply, and connects the of described dust sensor GP by resistance R1
One pin, first pin of described dust sensor GP is connected with the positive pole of polar capacitor C1, and described polarized electric capacity C1's is negative
Pole connects the second pin of described dust sensor GP, and the second pin of described dust sensor GP is connect together with the 4th pin
Ground, the colelctor electrode of the 3rd pin connecting triode Q1 of described dust sensor GP, the grounded emitter of described triode Q1, institute
The base stage stating triode Q1 is connected to the 17th pin of described sampling A/D chip MSP, described dust sensor GP by resistance R2
The 5th pin be connected to the 7th pin of described sampling A/D chip MSP, the 7th pin of described sampling A/D chip MSP by resistance R3
It is also connected with one end of resistance R4, the other end the first pin, the 4th pin with described sampling A/D chip MSP respectively of described resistance R4
Connect and be grounded with the 8th pin, the 5th pin of described sampling A/D chip MSP and the 48th pin connect external 3V power supply.
2. the sample circuit of air quality detector as claimed in claim 1 is it is characterised in that the resistance value of described resistance R1
For 150 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610817780.8A CN106442242A (en) | 2016-09-12 | 2016-09-12 | Sampling circuit of air quality detection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610817780.8A CN106442242A (en) | 2016-09-12 | 2016-09-12 | Sampling circuit of air quality detection instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106442242A true CN106442242A (en) | 2017-02-22 |
Family
ID=58167663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610817780.8A Pending CN106442242A (en) | 2016-09-12 | 2016-09-12 | Sampling circuit of air quality detection instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106442242A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749078A (en) * | 2015-04-13 | 2015-07-01 | 武汉大学 | PM2.5 concentration detector |
| CN104776513A (en) * | 2015-04-26 | 2015-07-15 | 中国计量学院 | Internal and external air purifier with automatic filter core replacement prompting function |
| CN104833774A (en) * | 2015-04-26 | 2015-08-12 | 柴俊沙 | Fog and haze on-line monitoring device |
| CN105466824A (en) * | 2015-12-10 | 2016-04-06 | 榆林学院 | PM2.5 real-time monitoring device |
| CN206420731U (en) * | 2016-09-12 | 2017-08-18 | 苏州工业园区职业技术学院 | A kind of sample circuit of air quality detector |
-
2016
- 2016-09-12 CN CN201610817780.8A patent/CN106442242A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749078A (en) * | 2015-04-13 | 2015-07-01 | 武汉大学 | PM2.5 concentration detector |
| CN104776513A (en) * | 2015-04-26 | 2015-07-15 | 中国计量学院 | Internal and external air purifier with automatic filter core replacement prompting function |
| CN104833774A (en) * | 2015-04-26 | 2015-08-12 | 柴俊沙 | Fog and haze on-line monitoring device |
| CN105466824A (en) * | 2015-12-10 | 2016-04-06 | 榆林学院 | PM2.5 real-time monitoring device |
| CN206420731U (en) * | 2016-09-12 | 2017-08-18 | 苏州工业园区职业技术学院 | A kind of sample circuit of air quality detector |
Non-Patent Citations (1)
| Title |
|---|
| 兰冰芯 等: "基于单片机的PM2.5测试仪的设计与实现", 《物联网技术》, vol. 4, no. 11, 30 November 2014 (2014-11-30), pages 32 - 34 * |
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