Template: MQ-3 Sensor Spec

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Overview

The gas sensing material used in the MQ-3 gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is alcohol vapor in the environment where the sensor is located, the conductivity of the sensor increases with the increase in the concentration of alcohol vapor in the air.

Features

  • Sensitive for alcohol, ethanol
  • Output voltage boosts along with the concentration of the measured gases increases
  • Fast response and recovery
  • Adjustable sensitivity
  • Signal output indicator

Specification

  • Power: 2.5V ~ 5.0V
  • Dimension: 40.0mm * 21.0mm
  • Mounting holes size: 2.0mm

Pinouts

PIN Description
DOUT Digital data output
AOUT Analog data output
GND Ground
VCC Power input (2.5V~5.0V)