CN203606342U - Indoor air formaldehyde content measuring meter - Google Patents
Indoor air formaldehyde content measuring meter Download PDFInfo
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- CN203606342U CN203606342U CN201320738542.XU CN201320738542U CN203606342U CN 203606342 U CN203606342 U CN 203606342U CN 201320738542 U CN201320738542 U CN 201320738542U CN 203606342 U CN203606342 U CN 203606342U
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- circuit
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- chip microcomputer
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Abstract
The utility model discloses an indoor air formaldehyde content measuring meter which consists of a power supply circuit, a detection circuit, a singlechip circuit and an LCD (Liquid Crystal Display) display circuit, wherein the power supply circuit is used for supplying a working power supply to the detection circuit, the singlechip circuit and the LCD display circuit; the detection circuit is used for converting formaldehyde content in the air into voltage which is output to the singlechip circuit; the singlechip circuit is used for converting the formaldehyde content in the air into digital quantity and used for driving the LCD display circuit to display the digital quantity. The measuring meter is capable of measuring the formaldehyde content in the air and displaying the content in the LCD display, is simple in circuit, high in reliability, low in cost and low in power consumption, can work continuously for a long time as a battery is adopted for power supply, and can be applied to continuous measurement on the formaldehyde content in the indoor air.
Description
Technical field
The utility model relates to a kind of gas detection alarm device, especially a kind of Indoor Air Formaldehyde content measurement meter.
Background technology
Ceiling, wall paper, ornament materials and furniture, chemical fibre carpet and the polyfoam etc. such as wallpaper, all kinds of wood-based plate, paint all contain formaldehyde composition and likely distribute to the external world, the formaldehyde slowly discharging is to human body, especially infant, pregnant women, old man and chronic cause long-term damage, therefore, after new house finishing, need to detect the content of formaldehyde in room air.The existing equipment price that can carry out continuous detecting is generally higher, and power consumption is large.
Summary of the invention
The purpose of this utility model aims to provide the Indoor Air Formaldehyde content measurement meter that a kind of reliability is high, cost is low.
The technical scheme that the utility model is taked is: a kind of Indoor Air Formaldehyde content measurement meter, is made up of power circuit, testing circuit, single chip circuit, LCD display circuit.Power circuit provides working power to testing circuit, single chip circuit, LCD display circuit, testing circuit converts airborne content of formaldehyde to Voltage-output to single chip circuit, single chip circuit converts airborne content of formaldehyde to digital quantity, and drives LCD display circuit to show.
Described power circuit is made up of electric battery and the first Capacitance parallel connection; Just very first supply voltage of electric battery, negative pole are for publicly.
Described testing circuit is made up of formaldehyde sensor, amplifier, potentiometer, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the second electric capacity; The power supply of testing circuit is second source voltage, and second source voltage is by single chip circuit control.
Described the 3rd resistance, the 4th resistor group become bleeder circuit to carry out dividing potential drop to second source voltage to obtain the 3rd supply voltage; The first resistance is the pull-up resistor of formaldehyde sensor.
Described amplifier, potentiometer, the second resistance, the second electric capacity form anti-phase I/U transducer, and input end, negative terminal that the anode of formaldehyde sensor is connected to anti-phase I/U transducer are connected to the 3rd supply voltage; Airborne content of formaldehyde voltage is exported between the 3rd supply voltage and the output terminal of anti-phase I/U transducer.
Described single chip circuit is made up of single-chip microcomputer, crystal oscillator, the 3rd electric capacity.
Described single-chip microcomputer is from output terminal output second source voltage; Airborne content of formaldehyde voltage is connected to the differential voltage input end of single-chip microcomputer.
Described LCD display circuit is made up of LCD display module, the 4th electric capacity.
The section control end of described LCD display module is connected to the section drive end of single-chip microcomputer; The LCD that the common port of LCD display module is connected to single-chip microcomputer controls common port; The 4th electric capacity two ends are connected to respectively the LCD pumping source capacitance terminal of single-chip microcomputer and publicly.
Described formaldehyde sensor is CH20/S-10 gas sensor.
Described amplifier is the rail-to-rail input and output integrated operational amplifier ADA4528-1 of ultra-low noise.
Described electric battery is made up of the alkaline battery of 2 joint 1.5V.
The model of described single-chip microcomputer is MSP430F4270.
The beneficial effects of the utility model are, can detect in real time airborne content of formaldehyde and show on LCD, and circuit is simple, and reliability is high, and cost is low; Low in energy consumption, while adopting 2 joint 1.5V alkaline batteries power supply, meter can continuous working for many years.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is job step schematic diagram of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
The utility model structured flowchart as shown in Figure 1, is made up of power circuit 100, testing circuit 200, single chip circuit 300, LCD display circuit 400.Power circuit 100 provides working power to testing circuit 200, single chip circuit 300, LCD display circuit 400, testing circuit 200 converts airborne content of formaldehyde to Voltage-output to single chip circuit 300, single chip circuit 300 converts airborne content of formaldehyde to digital quantity, and drives LCD display circuit 400 to show.
The utility model circuit as shown in Figure 2.
The power supply of testing circuit 200 is second source voltage+V2, and second source voltage+V2 is controlled by single chip circuit 300.
The 3rd resistance 207, the 4th resistance 208 form bleeder circuit second source voltage+V2 are carried out to dividing potential drop, obtain three supply voltage+V3; Three supply voltage+V3 is connected to "+" input end of amplifier 202.
The two ends of the first resistance 203 are connected to respectively anode I+ and the negative terminal I-of formaldehyde sensor 201, are the pull-up resistors of formaldehyde sensor 201.
Airborne content of formaldehyde voltage is exported between three supply voltage+V3 and anti-phase I/U converter output terminal.
The model of single-chip microcomputer 301 is MSP430F4270, and the oscillation frequency of crystal oscillator 302 is 32.768kHz.
Single-chip microcomputer 301 is from output terminal P1.0 output second source voltage+V2; Airborne content of formaldehyde voltage is connected to differential voltage input end A0+, the A0-of single-chip microcomputer 301.
The section that each section of control end of LCD display module 401 is connected to single-chip microcomputer 301 drives S0-S7 end; The LCD that the common port COM0-COM3 of LCD display module 401 is connected to single-chip microcomputer 301 controls common port COM0-COM3; The 4th electric capacity 402 two ends are connected to respectively the LCD pumping source capacitance terminal LCDCAP of single-chip microcomputer 301 and GND publicly.
The principle of work of testing circuit is:
The current conversion that anti-phase I/U transducer in testing circuit 200 is exported formaldehyde sensor 201 becomes differential voltage to deliver to differential voltage input end A0+, the A0-of single-chip microcomputer 301, and potentiometer 204 is for regulating conversion scale-up factor.
The job step principle of single-chip microcomputer 301 as shown in Figure 3, specifically:
When single-chip microcomputer 301 is operated in LPM3 pattern, CPU and lcd controller only consume 4.9 μ A electric currents; Be 1s the activation cycle of single-chip microcomputer 301, and after activating, the source current of single chip circuit 300 and testing circuit 200 is less than 1.2mA, establishes to carry out repeatedly A/D and change and complete data processing required time into 3ms, and the average working current of whole circuit is 8.5 μ A.The alkaline battery that while discharging into 0.9V with 2 joint 1.5V, single-unit, useful capacity is 700mAh is powered, and does not consider the self discharge factor of battery, and the working time reaches 82000 hours, or 9.4 years.
Claims (5)
1. an Indoor Air Formaldehyde content measurement meter, is made up of power circuit, testing circuit, single chip circuit, LCD display circuit, it is characterized in that:
Described power circuit is made up of electric battery and the first Capacitance parallel connection; Just very first supply voltage of electric battery, negative pole are for publicly;
Described testing circuit is made up of formaldehyde sensor, amplifier, potentiometer, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the second electric capacity; The power supply of testing circuit is second source voltage, and second source voltage is by single chip circuit control;
Described the 3rd resistance, the 4th resistor group become bleeder circuit to carry out dividing potential drop to second source voltage to obtain the 3rd supply voltage; The two ends of the first resistance are connected to respectively anode and the negative terminal of formaldehyde sensor;
Described amplifier, potentiometer, the second resistance, the second electric capacity form anti-phase I/U transducer, and input end, negative terminal that the anode of formaldehyde sensor is connected to anti-phase I/U transducer are connected to the 3rd supply voltage; Airborne content of formaldehyde voltage is exported between the 3rd supply voltage and the output terminal of anti-phase I/U transducer;
Described single chip circuit is made up of single-chip microcomputer, crystal oscillator, the 3rd electric capacity;
Described single-chip microcomputer is from output terminal output second source voltage; Airborne content of formaldehyde voltage is connected to the differential voltage input end of single-chip microcomputer;
Described LCD display circuit is made up of LCD display module, the 4th electric capacity;
The section control end of described LCD display module is connected to the section drive end of single-chip microcomputer; The LCD that the common port of LCD display module is connected to single-chip microcomputer controls common port; The 4th electric capacity two ends are connected to respectively the LCD pumping source capacitance terminal of single-chip microcomputer and publicly.
2. Indoor Air Formaldehyde content measurement meter as claimed in claim 1, is characterized in that: described formaldehyde sensor is CH20/S-10 gas sensor.
3. Indoor Air Formaldehyde content measurement meter as claimed in claim 1, is characterized in that: described amplifier is the rail-to-rail input and output integrated operational amplifier ADA4528-1 of ultra-low noise.
4. Indoor Air Formaldehyde content measurement meter as claimed in claim 1, is characterized in that: described electric battery is made up of the alkaline battery of 2 joint 1.5V.
5. Indoor Air Formaldehyde content measurement meter as claimed in claim 1, is characterized in that: the model of described single-chip microcomputer is MSP430F4270.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320738542.XU CN203606342U (en) | 2013-11-21 | 2013-11-21 | Indoor air formaldehyde content measuring meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320738542.XU CN203606342U (en) | 2013-11-21 | 2013-11-21 | Indoor air formaldehyde content measuring meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203606342U true CN203606342U (en) | 2014-05-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320738542.XU Expired - Fee Related CN203606342U (en) | 2013-11-21 | 2013-11-21 | Indoor air formaldehyde content measuring meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203606342U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372389A (en) * | 2015-10-27 | 2016-03-02 | 刘志海 | Indoor formaldehyde detection system based on GSM communication |
| CN112198197A (en) * | 2020-10-13 | 2021-01-08 | 海南聚能科技创新研究院有限公司 | Formaldehyde gas sensor module |
-
2013
- 2013-11-21 CN CN201320738542.XU patent/CN203606342U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372389A (en) * | 2015-10-27 | 2016-03-02 | 刘志海 | Indoor formaldehyde detection system based on GSM communication |
| CN112198197A (en) * | 2020-10-13 | 2021-01-08 | 海南聚能科技创新研究院有限公司 | Formaldehyde gas sensor module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20141121 |
|
| EXPY | Termination of patent right or utility model |