MQ-9 Carbon Monoxide Combustible Gas Sensor Arduino

The sensor detects concentration of combustible gas: Methane, Propane and Carbon Monoxide in the air.
Results can be obtained by measuring the voltage on the analog output. The system should be supplied with voltage from 2.5 V to 5 V.

Thanks to built-in voltage converter, it is possible to use with 5V logic devices.

Specification:
- Supply voltage: 2.5V-5V
- Outputs: analog, digital
- Working temperature: -10 C - 45 C
- 3mm Mounting holes
- Dimensions: 31mm x 20mm x H 22mm