MQ135 air quality sensor module
Description：
The gas sensitive material used in the MQ-135 gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is polluting gas in the environment where the sensor is located, the conductivity of the sensor varies with the concentration of the polluted gas in the air. Increase and increase. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration.
The MQ-135 gas sensor has high sensitivity to ammonia, sulfide, and benzene vapors. It is also ideal for detecting smoke and other harmful gases. This sensor can detect a variety of harmful gases and is a low-cost sensor suitable for a variety of applications.
Features:
1. Good sensitivity to harmful gases in a wide concentration range
2. High sensitivity to ammonia, sulfide and benzene atmospheres
3. Long life, low cost
4. Simple driving circuit
Working voltage: 5 VDC
Power consumption (current): 150 mA
Output form: analog and digital output
Attention:
When the MQ sensor module is connected to VCC and GND, the power indicator of the module will light up. Before using, the power supply should be warmed up for at least 2 minutes. It is normal for the sensor to heat up slightly because there is a heating wire inside.
Wire it correctly! Do not reverse the positive and negative connections, which will burn out the electronic components of the board. The sensitivity of the sensor probe is non-linear, so the analog output voltage has a non-linear relationship with the concentration of sensitive gas. In the actual test, the distance from the sensitive source gas will be different in concentration. The 5.1ohm resistor is connected in the heating circuit of the sensor to protect the heating wire from the impact of cold power-on.
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MQ135 air quality sensor module
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