Pololu Methane Gas Sensor MQ-4

Connections

Connecting five volts across the heating (H) pins keeps the sensor hot enough to function correctly. Connecting five volts at either the A or B pins causes the sensor to emit an analog voltage on the other pins. A resistive load between the output pins and ground sets the sensitivity of the detector. Please note: that the picture in the datasheet for the top configuration is wrong. Both configurations have the same pinout consistent with the bottom configuration.The resistive load should be calibrated for your particular application using the equations in the datasheet, but a good starting value for the resistor is 20 kO.

We offer a Pololu breakout board that makes it easier to interface with these sensors.

Documentation

This methane gas sensor detects the concentration of methane gas in the air and ouputs its reading as an analog voltage. The concentration sensing range of 300 ppm to 10,000 ppm is suitable for leak detection. For example, the sensor could detect if someone left a gas stove on but not lit. The sensor can operate at temperatures from -10 to 50°C and consumes less than 150 mA at 5 V. Please read the MQ4 datasheet (161k pdf) for more information about the sensor.


Pololu Methane Gas Sensor MQ-4

  • Product Code: TS-056-MQ4
  • Brand: Pololu
  • MPN: 1633
  • Availability: Discontinued

This product is unavailable.

Contact us if you have any questions.

Related Products

Pololu MQ Gas Sensor Carrier
Pololu MQ Gas Sensor Carrier

This breakout board is designed to work with any of the MQ-series gas sensors, simplifying the inter..

Product Code: TS-056-MQ0

$1.62

Pololu Flammable Gas & Smoke Sensor MQ-2
Pololu Flammable Gas & Smoke Sensor MQ-2

This flammable gas and smoke sensor detects the concentrations of combustible gas in the air and oup..

Product Code: TS-056-MQ2

$5.34

Pololu Alcohol Gas Sensor MQ-3
Pololu Alcohol Gas Sensor MQ-3

This alcohol gas sensor detects the concentration of alcohol gas in the air and ouputs its reading a..

Product Code: TS-056-MQ3

$6.04

Pololu Carbon Monoxide Gas Sensor MQ-7
Pololu Carbon Monoxide Gas Sensor MQ-7

This Carbon Monoxide (CO) gas sensor detects the concentrations of CO in the air and ouputs its read..

Product Code: TS-056-MQ7

$9.24