MQ135 air quality sensor for Arduino, NodeMCU
MQ135 air quality sensor for Arduino, NodeMCU
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MQ135 air quality sensor for Arduino, NodeMCU

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MQ-135 air quality sensor for Arduino, NodeMCU

The MQ135 sensor monitors the room air. According to the manufacturer's data sheet for CO2, alcohol, benzene, NOx, NH3.

Highlights

  • This sensor is ready for connection to microcontrollers such as a NodeMCU.
  • The module has a potentiometer to set the threshold value. The sensor only outputs a 0 or 1 on the digital pin, depending on whether the set threshold value is exceeded. 

Important information

  • The sensor gets warm during operation.
  • The sensor has a burn-in phase ". The values stabilize after approx. 48 hours.
  • The sensor has a warm-up phase of approx. 30 seconds until it delivers correct values.

Assignment of the pins

  • VCC: power supply 5V
  • GND: ground connection
  • AOUT: Analog output
  • DOUT: digital output