Pololu Flammable Gas & Smoke Sensor MQ-2

This flammable gas and smoke sensor detects the concentrations of combustible gas in the air and ouputs its reading as an analog voltage. The sensor can measure concentrations of flammable gas of 300 to 10,000 ppm.The sensor can operate at temperatures from -20° to 50°C and consumes less than 150 mA at 5 V. Please read the MQ2 datasheet (184k pdf) for more information about the sensor. Connecting five volts across the heating (H) pins keeps the sensor hot enough to function correctly. Connecting five vol...