MQ-135 Air Quality Gas Sensor Module

23.00

The MQ-135 Gas sensors are used in air quality control equipment and are suitable for detecting or measuring of NH3, NOx, Alcohol, Benzene, Smoke, CO2. The MQ-135 sensor module comes with a Digital Pin which makes this sensor to operate even without a microcontroller and that comes in handy when you are only trying to detect one particular gas.

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Description

Pin Configuration

Pin No: Pin Name: Description
For Module
1 Vcc Used to power the sensor, Generally the operating voltage is +5V.
2 Ground Used to connect the module to system ground.
3 Digital Out You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer.
4 Analog Out This pin outputs 0-5V analog voltage based on the intensity of the gas.
For Sensor
1 H -Pins Out of the two H pins, one pin is connected to supply and the other to ground.
2 A-Pins The A pins and B pins are interchangeable. These pins will be tied to the Supply voltage.
3 B-Pins The A pins and B pins are interchangeable. One pin will act as output while the other will be pulled to ground.

MQ-135 Sensor Features

  • Wide detecting scope
  • Fast response and High sensitivity
  • Stable and long life
  • Operating Voltage is +5V.
  • Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
  • Analog output voltage: 0V to 5V
  • Digital output voltage: 0V or 5V (TTL Logic)
  • Preheat duration 20 seconds.
  • Can be used as a Digital or analog sensor.
  • The Sensitivity of Digital pin can be varied using the potentiometer.

Documentation