CN204330655U - A kind of portable formaldehyde and PM2.5 pick-up unit - Google Patents
A kind of portable formaldehyde and PM2.5 pick-up unit Download PDFInfo
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- CN204330655U CN204330655U CN201420842880.2U CN201420842880U CN204330655U CN 204330655 U CN204330655 U CN 204330655U CN 201420842880 U CN201420842880 U CN 201420842880U CN 204330655 U CN204330655 U CN 204330655U
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Abstract
A kind of portable formaldehyde and PM2.5 pick-up unit, comprise formaldehyde examination module, PM2.5 detection module, Temperature and Humidity module, microprocessor module, radio receiving transmitting module, LCD MODULE and keyboard input module.Keyboard input module arranges testing conditions, formaldehyde examination module, PM2.5 detection module and Temperature and Humidity module measure PM2.5 concentration, concentration of formaldehyde and temperature-humidity signal respectively, microprocessor module is delivered to after signal conversion, through signal transacting, in LCD MODULE, show the real time data information of concentration of formaldehyde, PM2.5 concentration, humiture.Radio receiving transmitting module utilizes wireless mode to realize remote access, completes Real-Time Monitoring and the historical information retrieval of current detected state.This portable formaldehyde and PM2.5 detector adopt electric chemical formula formaldehyde sensor and optics dust sensor, have good sensitivity and response speed, can be used for the place such as family, office.
Description
Technical field
The utility model belongs to electronic surveying field, is specifically related to a kind of portable formaldehyde and PM2.5 pick-up unit.
Background technology
Formaldehyde is a kind of colourless, hypertoxic gas of having intense stimulus smell, and the World Health Organization (WHO) is asserted carcinogenic and teratogenesis chemicals it.Along with the raising of living standard, increasing people starts the content of formaldehyde paying close attention to oneself living environment.PM2.5 refers to that surrounding air diameter is less than or equal to the particle of 2.5 microns, and PM2.5 particle diameter is little, and area is large, active strong, easily attach poisonous and harmful substances, and grow, fed distance is far away, thus large on the impact of health and atmosphere quality the residence time in an atmosphere.
At present, the detection for formaldehyde mainly contains electrochemical assay, spectra photometric method, vapor-phase chromatography and liquid phase chromatography etc., and the detection for PM2.5 mainly contains light scattering method, concussion sedimentation balance method and weight method.Methylene oxide detecting instrument on the market and PM2.5 detector are mostly independent individuals, and measuring ability is single, and sensitivity is lower, intelligence degree is not high.And the product with multiple gases measuring ability that minority producer releases, relative price is expensive, volume is comparatively large, is not easy to carry, is unsuitable for holding and using of the place such as average family and office.
Utility model content
The defect that the utility model exists for existing pick-up unit, aim to provide a kind of portable formaldehyde and PM2.5 pick-up unit, this device has good sensitivity and response speed, and is suitable for average family and Office Space is held and uses.
The utility model realizes especially by following technical scheme:
A kind of portable formaldehyde and PM2.5 pick-up unit, comprise formaldehyde examination module, PM2.5 detection module, Temperature and Humidity module, microprocessor module, radio receiving transmitting module, LCD MODULE and keyboard input module, described microprocessor module is provided with ADC, PWM, SPI, I
2c, serial ports and digital I/O interface, wherein formaldehyde examination model calling is to ADC interface, and PM2.5 detection module is connected to PWM interface, and Temperature and Humidity model calling is to I
2c interface, radio receiving transmitting module is connected to SPI interface, and LCD MODULE and keyboard input module are connected to digital I/O interface.
Described formaldehyde examination module comprises electric chemical formula formaldehyde sensor, signal amplification circuit, temperature-compensation circuit; Formaldehyde sensor includes two electrode fuel cell sensors, its export current value and air in linear to the concentration of formaldehyde of high concentration from zero; Signal amplification circuit uses low-power, the low noise operational amplifier of a dual power supply, is connected into the amplifying circuit form that electric current turns voltage; Temperature-compensation circuit realizes by adding a thermistor in operational amplifier feedback loop.
Described PM2.5 detection module comprises dust sensor, optical coupling isolation circuit, and dust sensor adopts the PWM pulsewidth way of output, inside establishes flow generator, can attract outside atmosphere voluntarily, detects PM2.5 concentration; Optical coupling isolation circuit is used for modulation (PWM) signal, and carries out protective separation to microprocessor module.
Described Temperature and Humidity module adopts the humiture compound sensor containing calibrating digital signal output, sensing element and signal processing circuit are integrated on one piece of micro-circuit board, comprise a resistive sense to wet element and a temperature element, export the digital signal of demarcating completely, directly can be connected with the digital I/O pin of microprocessor module.
Described microprocessor module adopts 32-bit microprocessor STM32F103RCT6 as main control chip, and its most high primary frequency is 72MHz, the FLASH of the RAM of 48K byte, 256K byte.
Described radio receiving transmitting module comprises antenna and wireless transceiver, and wireless transceiver just can be connected with microprocessor module by a SPI interface, and output power and communication channel can be configured by the main control chip of microprocessor module.
The beneficial effects of the utility model are: this portable formaldehyde and PM2.5 pick-up unit utilize the serial ports of radio receiving transmitting module or microprocessor module, upper computer equipment is by communication data management software, historical data can be consulted at any time, observed data curve, carry out data analysis, there is good sensitivity and response speed, can be used for the place such as family, office.
Accompanying drawing explanation
Fig. 1 is the system architecture schematic diagram of the utility model device;
Fig. 2 is the formaldehyde examination module circuit diagram of the utility model device;
Fig. 3 is the PM2.5 detection module circuit diagram of the utility model device;
Fig. 4 is the Temperature and Humidity module circuit diagram of the utility model device;
Fig. 5 is the microprocessor module circuit diagram of the utility model device;
Fig. 6 is the radio receiving transmitting module circuit diagram of the utility model device;
Fig. 7 is the keyboard input module circuit diagram of the utility model device;
Embodiment
Below in conjunction with accompanying drawing, explanation is further explained to the utility model content.
As shown in Fig. 1 ~ Fig. 7, a kind of portable formaldehyde and PM2.5 pick-up unit, comprise formaldehyde examination module, PM2.5 detection module, Temperature and Humidity module, microprocessor module, radio receiving transmitting module, LCD MODULE, keyboard input module, main control chip on microprocessor module has PA, PB, PC tri-groups of ports, respectively there are 16 pins, can ADC, PWM, SPI, I be set to
2the multiple interfaces patterns such as C, serial ports, digital I/O, wherein formaldehyde examination model calling is to ADC interface, and PM2.5 detection module is connected to PWM interface, and Temperature and Humidity model calling is to I
2c interface, radio receiving transmitting module is connected to SPI interface, and LCD MODULE and keyboard input module are connected to digital I/O interface.
Formaldehyde examination module 1 comprises electric chemical formula formaldehyde sensor, signal amplification circuit, temperature-compensation circuit.Formaldehyde sensor realizes the collection of formaldehyde signal, include two electrode fuel cell sensors, electrochemical reaction is produced by its inner noble metal electrode and formaldehyde, concentration of formaldehyde is converted to faint analog current signal, linear to the concentration of formaldehyde of high concentration from zero in the current value of output and air.Signal amplification circuit is connected into the amplifying circuit form that electric current turns voltage, uses low-power, the low noise operational amplifier of a dual power supply, and the faint analog current signal exported for PARA FORMALDEHYDE PRILLS(91,95) sensor amplifies.Temperature-compensation circuit is realized by the thermistor adding a negative temperature coefficient in operational amplifier feedback loop, and this thermistor can be revised by the connection in series-parallel of the resistance with other.Under the software control of microprocessor module 4, the compensation of thermistor can be more accurate, and through temperature compensation, the linearity of formaldehyde sensor can reach 5ppm.Signal amplification circuit adopts negative feedback structure for amplifying, geometric ratio Linear Amplifer and noise reduction process are carried out to the concentration of formaldehyde signal of input, then the ADC interface sending into microprocessor module 4 carries out analog to digital conversion, by the us level ADC of 1 12, the concentration of formaldehyde simulating signal after amplification is converted to digital signal, by the main control chip of microprocessor module 4, digital filtering and number system transition are carried out to it again, the measurement data obtained sends into the liquid crystal display drive circuit of LCD MODULE 6 by I/O interface, liquid crystal display drive circuit is that special liquid crystal display screen carries out drives, realize the display of test data and control inerface.
PM2.5 detection module 2 comprises dust sensor, optical coupling isolation circuit.Dust sensor selects DSM501A, based on light scattering principle, adopts the method for particle counting, detects the dust concentration in air, export the PWM pulse-width signal of 5V.Optical coupling isolation circuit carries out level conversion, Phototube Coupling and power drive to PWM pulse-width signal, signal is imported into the digital I/O interface of microprocessor module 4, completed the low pulse rate calculation of PWM pulse-width signal by main control chip to obtain PM2.5 concentration.
Temperature and Humidity module 3 adopts one containing the humiture compound sensor SHT11 calibrating digital signal output.This sensor adopts special digital module acquisition technique and temperature and humidity sensing technology, has high reliability and stability.Sensing element and signal processing circuit are integrated on one piece of micro-circuit board, comprise a resistive sense and to wet element and a temperature element.Calibration factor is stored in OTP internal memory with the form of program, and sensor internal will call these calibration factors in the processing procedure of detection signal.Adopt one wire system serial line interface, export the digital signal of demarcating completely, directly can be connected with the digital I/O interface of microprocessor module 4.
Microprocessor module 4 adopts 32 monolithic processor STM32F103RCT6 as main control chip, and its most high primary frequency is 72MHz, and the FLASH of the RAM of 48K byte, 256K byte, performance substantially reduces the time of interrupt response, and simultaneous processor power consumption is very low.This integrated chip CAN, I
2the conventional communication interface such as C, SPI, UART, has connective flexibly.
Radio receiving transmitting module 5 comprises antenna and wireless transceiver, adopts NRF24L01 as wireless transceiver, just can be connected with microprocessor module 4 by a SPI interface.NRF24L01 can work in 2.4GHz ~ 2.5GHz frequency range, built-in frequency generator, mode controller, power amplifier, crystal oscillator, modulator and demodulator, and output power and communication channel can be configured by the main control chip of microprocessor module 4.Utilize the serial ports of radio receiving transmitting module 5 or microprocessor module 4, upper computer equipment, by communication data management software, can consult historical data at any time, observed data curve, carry out data analysis, there is good sensitivity and response speed, can be used for the place such as family, office.
LCD MODULE 6 adopts dot character type liquid crystal display cells LCD1602, comprising liquid crystal display drive circuit and LCDs, adopt 8 bit data transmission modes, be connected to the digital I/O interface of microprocessor module 4 by the double socket of 16 pin of a standard.
Keyboard input module 7 adopts 4 × 4 membrane keyboards, is connected to the digital I/O interface of microprocessor module 4 by the single socket of 8 pin of a standard.
Claims (6)
1. a portable formaldehyde and PM2.5 pick-up unit, comprise formaldehyde examination module, PM2.5 detection module, Temperature and Humidity module, microprocessor module, radio receiving transmitting module, LCD MODULE, keyboard input module, it is characterized in that: described microprocessor module is provided with ADC, PWM, SPI, I
2c, serial ports and digital I/O interface, wherein formaldehyde examination model calling is to ADC interface, and PM2.5 detection module is connected to PWM interface, and Temperature and Humidity model calling is to I
2c interface, radio receiving transmitting module is connected to SPI interface, and LCD MODULE and keyboard input module are connected to digital I/O interface.
2. pick-up unit according to claim 1, is characterized in that: described formaldehyde examination module comprises electric chemical formula formaldehyde gas sensor, signal amplification circuit, temperature-compensation circuit;
Described formaldehyde gas sensor is containing two electrode fuel cell sensors, linear to the concentration of formaldehyde of high concentration from zero in its current value exported and air;
Described signal amplification circuit adopts operational amplifier to be connected into the amplifying circuit form that electric current turns voltage;
Described temperature-compensation circuit realizes by adding a thermistor in operational amplifier feedback loop.
3. pick-up unit according to claim 1; it is characterized in that: described PM2.5 detection module comprises dust sensor, optical coupling isolation circuit; described dust sensor adopts the PWM pulsewidth way of output; described optical coupling isolation circuit is used for modulation (PWM) signal, and carries out protective separation to microprocessor module.
4. pick-up unit according to claim 1, it is characterized in that: described Temperature and Humidity module adopts humiture compound sensor, by sensing element and signal processing circuit being integrated on one piece of circuit board, comprise a resistive sense to wet element and a temperature element, export the digital signal of demarcating completely.
5. pick-up unit according to claim 1, is characterized in that: described microprocessor module adopts 32 monolithic processor STM32F103RCT6 as main control chip, and its most high primary frequency is 72MHz, the FLASH of the RAM of 48K byte, 256K byte.
6. pick-up unit according to claim 1, is characterized in that: described radio receiving transmitting module comprises antenna and wireless transceiver, and wireless transceiver is connected with microprocessor module by SPI interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420842880.2U CN204330655U (en) | 2014-12-26 | 2014-12-26 | A kind of portable formaldehyde and PM2.5 pick-up unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420842880.2U CN204330655U (en) | 2014-12-26 | 2014-12-26 | A kind of portable formaldehyde and PM2.5 pick-up unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204330655U true CN204330655U (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420842880.2U Expired - Fee Related CN204330655U (en) | 2014-12-26 | 2014-12-26 | A kind of portable formaldehyde and PM2.5 pick-up unit |
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|---|---|
| CN (1) | CN204330655U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738439A (en) * | 2016-02-28 | 2016-07-06 | 北京工业大学 | Portable outdoor high-accuracy equipment for monitoring concentrations of multiple gases |
| CN109030747A (en) * | 2018-08-30 | 2018-12-18 | 武汉欣叶电子科技有限公司 | A kind of device and detection method of continuous detection air quality |
| CN109426189A (en) * | 2017-08-31 | 2019-03-05 | 广州知识谷信息技术服务有限公司 | Air quality integrated detecting device |
-
2014
- 2014-12-26 CN CN201420842880.2U patent/CN204330655U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105738439A (en) * | 2016-02-28 | 2016-07-06 | 北京工业大学 | Portable outdoor high-accuracy equipment for monitoring concentrations of multiple gases |
| CN105738439B (en) * | 2016-02-28 | 2018-09-04 | 北京工业大学 | Outdoor high-precision multiple gases concentration monitor portable equipment |
| CN109426189A (en) * | 2017-08-31 | 2019-03-05 | 广州知识谷信息技术服务有限公司 | Air quality integrated detecting device |
| CN109030747A (en) * | 2018-08-30 | 2018-12-18 | 武汉欣叶电子科技有限公司 | A kind of device and detection method of continuous detection air quality |
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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: 20150513 Termination date: 20151226 |
|
| EXPY | Termination of patent right or utility model |