The MQ-9 is a sensor that can detect carbon monoxide and flammable gas and has a high sensitivity to these gases. The conductivity of the sensor is higher, which is accompanied by an increased concentration of gases.

• It works with a voltage of 5V.
• It has digital (TTL level) and analog outputs.
• High sensitivity to methane, propane and carbon monoxide gases.
• It has a long service life and low cost.
• Simple drive circuit.
• It has a wide range of applications, such as detecting gas leaks in homes, in the industrial field or as a portable gas detector.