MQ-9 Carbon Monoxide & Combustible Gas Sensor Module

The MQ-9 Carbon Monoxide & Combustible Gas Sensor Module detects carbon monoxide, methane, and LPG by cycling its heater between a high and low temperature to separately sense flammable gases and CO. It outputs both a raw analog voltage and an adjustable digital trigger, making it easy to add gas monitoring to any microcontroller project.

Key features:

• Dual-Gas Detection: Cycles the internal heater between high and low temperature to detect both combustible gases (LPG, methane) and carbon monoxide.
• Wide Sensing Range: Detects concentrations from roughly 10 to 1000 ppm of CO and combustible gas.
• Analog and Digital Output: Provides a raw analog voltage plus a threshold-based digital output set by the onboard potentiometer.
• Fast Response: High sensitivity and quick recovery suit continuous air-quality monitoring.
• Simple 4-Pin Interface: VCC, GND, digital, and analog output pins for easy breadboard or Arduino wiring.
• Long Service Life: Stable, low-cost tin dioxide sensing element with long-term reliability.