MQ-135 Sensor – Ammonia, NOx,Benzene,Sulfide


SKU: SB-088 Category:


The MQ-135 Air Quality Sensor Module detects Ammonia (NH3), Alcohol, Benzene, Smoke, Carbon-dioxide (CO2), Mono-nitrogen oxides (NOx) etc. They are widely used in air quality control equipments for buildings/offices, personal, homes and industrial applications. The material inside the Sensor is the SnO2 who has conductivity lower than the clean air. The conductivity of the sensor increases as the concentration of the gas increases. This module can easily be integrated in all microcontroller projects such as Arduino, Raspberry Pi, IoT and etc. This board can give you the Analog and Digital Output signal.

Features / Specifications

  • Preheat time                  : Over 20s
  • Dimension                     : 32mm x 22m x 27mm(HIGH 27mm)
  • Working voltage           : DC 5V
  • Working Current           : 150mA
  • Analog output voltage : 0V to 5V
  • Digital output voltage  : 0V or 5V (TTL Logic)
  • Wide detecting scope
  • Fast response and High sensitivity
  • Stable and long life
  • Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
  • Preheat duration 20 seconds
  • Can be used as a Digital or analog sensor
  • The Sensitivity of Digital pin can be varied using the potentiometer

Connection for circuit:

  • VCC       — 2.5V ~ 5.0V
  • GND       — power supply ground
  • AO (out) —MCU I/O (analog output)
  • DO (out) — MCU I/O (digital output)

Tutorials / Manuals / Documents

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