MQ-135 high-sensitivity air quality sensor Potentiometer for calibration Designed to use 5V power supply
Air Quality Click carries an MQ-135 sensor for detection of air pollutants. It is most sensitive to Acetone, Toluene, Alcohol, Ammonium, and Carbon Dioxide. It reacts slightly to Carbon Dioxide gas too, but the CO click is much better suited for that application. If Alcohol/Benzine is your concern, you should consider the Alcohol click for best performance.
The gas-sensing layer on the sensor unit is made of Tin Dioxide (SnO2), an inorganic compound which has lower conductivity in clean air. The conductivity increases as the level of ammonia, nitrogen oxides, benzine, smoke, CO2 and other harmful gases rise. The detection range is between 10 and 200 parts per million.
To calibrate the sensor for the environment you'll be using it in, this board has a small potentiometer that allows you to adjust the load resistance of the sensor circuit. For precise calibration, the sensor should be powered up for 24 hours.
Air Quality Click communicates with your target board through the mikroBUS AN (OUT) line.
Note: This board is designed to use 5V power supply only.
mikroBUS Click Boards Overview Click boards come with header pins that you must solder yourself. After that, they just plug directly into a mikroBUS socket. mikroBUS is a specially designed plug-and-play pinout standard. The sockets are found on Clicker boards, these mikromedia shields, and development systems from mikroElektronika (V7 systems and later).
You also can connect Click boards to many other popular platforms via these adapters:
- PC — Click USB Adapter (MIKROE-1433)
- Arduino — Arduino UNO click shield (MIKROE-1581)
- Raspberry Pi — Pi click shield (MIKROE-1512)
- BeagleBone Black — BeagleBone click shield (MIKROE-1596)
- STM32F3 Discovery — STM32F3 Discovery Shield (MIKROE-1447)
- STM32F4 Discovery — STM32F4 Discovery Shield (MIKROE-1481)
- Stellaris LM4F120 LaunchPad / Tiva TM4C123G LaunchPad — Click BOOSTER PACK (MIKROE-1363)
In addition, it is royalty-free to add mikroBUS to your own designs. Visit the mikroBUS Category to see the full line of Click boards.
Air Quality Sensor mikroBUS Module Resources Note: In the datasheet's graph of detected gases, three of the compounds are written in Chinese. Translations are below:
- 酒精 = Alcohol
- 甲苯 = Toluene
- 丙酮 = Acetone