CN211122644U

CN211122644U - Air quality detection terminal

Info

Publication number: CN211122644U
Application number: CN201922088124.0U
Authority: CN
Inventors: 邓志坚
Original assignee: Suzhou Jianzhuo Automation Technology Co ltd
Current assignee: Suzhou Jianzhuo Automation Technology Co ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-07-28
Anticipated expiration: 2029-11-28

Abstract

The utility model discloses an air quality detection terminal, which comprises a housin be equipped with air quality detecting system in the casing, air quality detecting system includes carbon monoxide sensor, temperature and humidity sensor, carbon dioxide sensor, PM2.5 sensor, formaldehyde sensor, controller and wireless communication module, carbon monoxide sensor, temperature and humidity sensor, carbon dioxide sensor, PM2.5 sensor, formaldehyde sensor and wireless communication module are connected with the controller respectively. The utility model discloses an air quality testing terminal, simple structure, detection accuracy is high, can detect carbon monoxide concentration, carbon dioxide concentration, humiture, PM2.5 concentration and formaldehyde concentration in the air, can also give other terminals through wireless communication module with the data transmission who gathers.

Description

Air quality detection terminal

Technical Field

The utility model particularly relates to an air quality testing terminal.

Background

In recent years, as people pay more attention to the problem of air pollution, people also pay attention to the development of air pollution detection technology. The air quality detection product is well applied in the period, but the air quality detection product on the market can only detect single type of gas generally, and although the air quality detection product can also detect products of multiple gas types, the structural design is not reasonable, and the detection precision and accuracy are reduced.

Therefore, there is an urgent need for an integrated air quality detection terminal capable of detecting a plurality of gases with high detection accuracy and accuracy.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides an air quality testing terminal, simple structure can detect the multiple gas concentration in the multiple air, and detection accuracy is high.

The utility model provides a pair of air quality testing terminal, which comprises a housin be equipped with air quality detecting system in the casing, air quality detecting system includes carbon monoxide sensor, temperature and humidity sensor, carbon dioxide sensor, PM2.5 sensor, formaldehyde sensor, controller and wireless communication module, carbon monoxide sensor, temperature and humidity sensor, carbon dioxide sensor, PM2.5 sensor, formaldehyde sensor and wireless communication module are connected with the controller respectively.

Further, the air quality detection system also comprises an alarm module, and the alarm module is connected with the controller.

Further, the alarm module includes fourth resistance, fifth resistance, third switching device, second diode and bee calling organ, the one end of fourth resistance is connected with the output of controller, the other end of fourth resistance is connected with the base of third switching device, the emitter ground of third switching device, the collecting electrode of third switching device is connected with the one end of bee calling organ and the positive pole of second diode respectively, the other end of bee calling organ is connected with the negative pole of second diode and the one end of fifth resistance respectively, the other end of fifth resistance is connected with external power supply.

Further, the air quality detection system also comprises a touch screen, and the touch screen is connected with the controller.

Further, the air quality detection system also comprises an exhaust fan, and the exhaust fan is connected with the controller.

Further, the air quality detection system also comprises a TVOC sensor, and the TVOC sensor is connected with the controller.

Furthermore, the wireless communication module adopts a WiFi module, the WiFi module comprises a WiFi main control chip, the RST port of the WiFi main control chip is connected with a reset button, and the TXD port and the RXD port of the WiFi main control chip are respectively connected with the controller.

Further, the model of the WiFi main control chip is ESP 8266.

Further, the controller adopts a chip model STM32F103RDT 6.

Further, the temperature and humidity sensor adopts DHT 11.

The utility model has the advantages that:

the utility model provides a pair of air quality testing terminal, simple structure, detection accuracy is high, can detect carbon monoxide concentration, carbon dioxide concentration, humiture, PM2.5 concentration and formaldehyde concentration in the air, can also give other terminals through wireless communication module with the data transmission who gathers.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural diagram of an air quality detection terminal according to a first embodiment of the present invention;

FIG. 2 is a circuit schematic of the controller of FIG. 1;

FIG. 3 is a schematic circuit diagram of the alarm module of FIG. 1;

fig. 4 is a schematic circuit diagram of the wireless communication module of fig. 1.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

Referring to fig. 1-4, a first embodiment of the present invention provides an air quality detecting terminal, including a housing, an air quality detecting system is disposed in the housing, the air quality detecting system includes a carbon monoxide sensor, a temperature and humidity sensor, a carbon dioxide sensor, a PM2.5 sensor, a formaldehyde sensor, a controller, and a wireless communication module, and the carbon monoxide sensor, the temperature and humidity sensor, the carbon dioxide sensor, the PM2.5 sensor, the formaldehyde sensor, and the wireless communication module are respectively connected to the controller.

The carbon monoxide sensor collects the concentration of carbon monoxide in the air, the carbon monoxide sensor adopts an NE-CO-B L type electrochemical sensor produced by Japan company, the range is 0-1000 PPM, the measurement of toxic gas by the electrochemical sensor is the current mainstream test method, the concentration of the measured CO gas is converted into a current value which is in direct proportion to the concentration of the CO gas, the current value is amplified and converted into a voltage value which is in direct proportion to the concentration of the CO gas, and then the voltage value is sent into an I/O port of a controller and then subjected to A/D conversion.

The temperature and humidity sensor adopts a digital quantity output mode, the model is DHT11, the temperature range is 0-50 ℃, and the humidity range is 20-95% RH. This kind of temperature and humidity sensor's advantage lies in: the price is cheap, and can satisfy the application demand, and its external circuit is simple.

The carbon dioxide sensor adopts a catalytic carbon dioxide sensor, is a solid electrolyte sensor, and has the principle that a gas-sensitive material generates ions when passing through gas so as to form electromotive force, and the electromotive force is measured so as to measure the concentration of the gas.

The PM2.5 sensor (dust sensor) works according to the principle of light scattering, and particles and molecules generate light scattering phenomenon under the irradiation of light, and simultaneously absorb part of the energy of the irradiated light. When a beam of parallel monochromatic light is incident to the measured particle field, the light intensity is attenuated under the influence of scattering and absorption around the particles. Therefore, the relative attenuation rate of the incident light passing through the concentration field to be measured can be obtained. And the relative attenuation rate is basically linear to reflect the relative concentration of the dust in the field to be measured. The intensity of the light intensity is in direct proportion to the intensity of the electric signal after photoelectric conversion, and the relative attenuation rate can be obtained by measuring the electric signal, so that the concentration of the indoor dust can be measured.

The formaldehyde sensor can be one of a formaldehyde oxide gas sensor, a formaldehyde gas molecular sieve sensor, a formaldehyde surface acoustic wave gas sensor, a visual fluorescence formaldehyde sensor and a formaldehyde gas electronic nose, formaldehyde gas passes through the sensor, formaldehyde molecules generate oxidation-reduction reaction on electrodes under the catalysis of electrolyte to form electron transfer, and current in direct proportion to the concentration of formaldehyde is formed under the action of external voltage.

In this embodiment, the model of the chip used by the master controller is STM32F103RDT 6. The STM32F103RDT6 chip operates at 72 MHz using a high performance ARMCortex-M3 TM 32-bit RISC core, high speed embedded memory and enhanced I/O peripherals connected to two APB buses, providing two 12-bit ADCs, three general purpose 16-bit timers plus one PWM timer, and standard and advanced communication interfaces: i is²C and SPI interface, three serial peripheral interfaces, a USB interface and a CAN interface. STM32F103RDT6 works on a power supply of 2V to 3.6V, and the working temperature range is-40 ℃ to +85 ℃. The carbon monoxide sensor, the temperature and humidity sensor, the carbon dioxide sensor, the PM2.5 sensor and the formaldehyde sensor send collected signals to the controller, and the controller processes the signals to obtain the concentrations of carbon monoxide, temperature and humidity, carbon dioxide, PM2.5 and formaldehyde in the air and obtain air quality data. Can also pass throughThe line communication module sends the air quality data who obtains to other terminals, lets the user in time know the air quality condition. The air quality detection terminal that this embodiment provided can detect the multiple gas concentration in the air, simple structure, and detection accuracy is high.

In some embodiments, the air quality detection system further comprises an alarm module coupled to the controller. The air quality detection system further comprises a touch screen, and the touch screen is connected with the controller. The alarm module comprises a fourth resistor, a fifth resistor, a third switching device, a second diode and a buzzer, one end of the fourth resistor is connected with the output end of the controller, the other end of the fourth resistor is connected with the base of the third switching device, the emitting electrode of the third switching device is grounded, the collecting electrode of the third switching device is connected with one end of the buzzer and the anode of the second diode respectively, the other end of the buzzer is connected with the cathode of the second diode and one end of the fifth resistor respectively, and the other end of the fifth resistor is connected with an external power supply. When the air is good, the concentration of various gases is different, the threshold value of the corresponding gas can be preset through the touch screen, when the air quality detection system detects that the concentration of the gas exceeds the threshold value, the controller controls the data to be displayed through the touch screen, meanwhile, the alarm module is controlled to work, an alarm signal is sent, and the light emitting of the diode and the sound emitting of the buzzer are controlled to prompt. The air quality detection system further comprises an exhaust fan, and the exhaust fan is connected with the controller. When the gas concentration exceeds the threshold value, the controller controls the exhaust fan to work, so that the air circulation is accelerated, the concentration of the overproof gas is reduced, and the air quality is improved.

In some embodiments, the wireless communication module includes a WiFi module, the WiFi module includes a WiFi main control chip, a RST port of the WiFi main control chip is connected to the reset button, and a TXD port and an RXD port of the WiFi main control chip are respectively connected to the controller. The model of the WiFi main control chip is ESP 8266.

In some embodiments, the air quality detection system further comprises a TVOC sensor connected to the controller. The TVOC sensor selects a CCS811 sensor, uses a PID detection technology, ionizes gas molecules to be detected by using ultraviolet rays generated by the vacuum discharge phenomenon of inert gas, and obtains the concentration of the gas to be detected by measuring the current intensity generated by the ionized gas. The CCS811 sensor sends the collected gas concentration to the controller.

Here, it is to be noted that the functions, algorithms, methods, etc. related to the present invention are only conventional adaptive applications of the prior art. Therefore, the present invention is an improvement of the prior art, and the substantial connection relationship between hardware is not directed to the function, algorithm, and method itself, that is, the present invention relates to a little function, algorithm, and method, but does not include the improvement of the function, algorithm, and method itself. The utility model discloses to the description of function, algorithm, method, be for better explanation the utility model discloses to better understanding the utility model discloses.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides an air quality detection terminal, includes the casing, its characterized in that be equipped with air quality detection system in the casing, air quality detection system includes carbon monoxide sensor, temperature and humidity sensor, carbon dioxide sensor, PM2.5 sensor, formaldehyde sensor, controller and wireless communication module, carbon monoxide sensor, temperature and humidity sensor, carbon dioxide sensor, PM2.5 sensor, formaldehyde sensor and wireless communication module are connected with the controller respectively.

2. The air quality detection terminal of claim 1, wherein the air quality detection system further comprises an alarm module, the alarm module being coupled to the controller.

3. The air quality detection terminal according to claim 2, wherein the alarm module comprises a fourth resistor, a fifth resistor, a third switching device, a second diode and a buzzer, one end of the fourth resistor is connected with the output end of the controller, the other end of the fourth resistor is connected with the base electrode of the third switching device, the emitter electrode of the third switching device is grounded, the collector electrode of the third switching device is respectively connected with one end of the buzzer and the anode electrode of the second diode, the other end of the buzzer is respectively connected with the cathode electrode of the second diode and one end of the fifth resistor, and the other end of the fifth resistor is connected with an external power supply.

4. The air quality detection terminal of claim 2, wherein the air quality detection system further comprises a touch screen, the touch screen being connected to the controller.

5. The air quality detection terminal of claim 3, wherein the air quality detection system further comprises an exhaust fan, the exhaust fan being connected to the controller.

6. The air quality detection terminal of claim 1, wherein the air quality detection system further comprises a TVOC sensor, the TVOC sensor being coupled to the controller.

7. The air quality detection terminal according to claim 1, wherein the wireless communication module is a WiFi module, the WiFi module includes a WiFi main control chip, a RST port of the WiFi main control chip is connected to a reset button, and a TXD port and a RXD port of the WiFi main control chip are respectively connected to the controller.

8. The air quality detection terminal of claim 7, wherein the WiFi master control chip is model ESP 8266.

9. The air quality detection terminal of any one of claims 1-8, wherein the controller is implemented using a chip model number STM32F103RDT 6.

10. The air quality detection terminal of claim 9, wherein the temperature and humidity sensor employs DHT 11.