Gaz sensor module MQ-7 (CO)
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Gaz sensor module MQ-7 (CO)

Carbon Monoxide Gas sensor MQ-7 (CO)

€9.04 (tax incl.) €7.47 (tax excl.)
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A carbon monoxide sensor (CO) with analog output

The MQ-7 sensor can detect Carbon Monoxide (CO) gas in the air. The concentrations of CO in the air impact the analog ouputs voltage that can be read with a microcontroler. The sensor can measure concentrations from 10 to 10,000 ppm and operate at temperatures from -10 to 50°C.

This sensor consumes less than 150 mA at 5 V. Please read the MQ7 datasheet (185k 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 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. The resistive load should be calibrated for your particular application using the equations in the datasheet, but a good starting value for this is a 10 kΩ resistor.


For each order, you will receive a MQ-7 gaz sensor and a board to ease its use. You will need to add a sensitivity resistor (eg: 10 KOhms) for the sensor.


Create a Carbon Monoxide smart sensor would be terribly exciting project. Create such sensor for your own equipment would be tempting. Please keep in mind that creating professional CO sensor must follow strict rules and specifications. Such detector are rigorously tested to ensure your security.
We do recommend to only use this sensor for experiment, learning and electronic hacking session. This would great to log data from laboratory experiment.
Please, DO NOT USE SUCH SENSOR TO "PROTECT LIFE"! Your should use a certified material because it fulfill the law and requirement.


  • Easy to drive and to wire
  • Type: MQ-7
  • Gaz : carbon monoxide
  • Range:10 to 10000 ppm
  • MQ-7 datasheet

Various MQ sensors kind

  • MQ-2: gaz and flammable smoke
  • MQ-3: Alcohol
  • MQ-4: Methane
  • MQ-7: CO (Carbon Monoxide)
  • MQ-8: Hydrogene
  • MQ-9: CO, methane, GPL (butane & propane)


Data sheet
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