MQ-2 gas sensor has high sensitivity to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is low cost and suitable for various applications.

Using high-quality dual-panel design, with a power indicator and TTL signal output instructions; With a the DO switch signal (TTL) output, and AO analog signal output; TTL output valid signal is low level; (When the low level output signal lights, it can be connected directly to the microcontroller or relay module)

TTL output signal can be connected directly to a microcontroller IO port or connect to the relay module, potentiometer is used to adjust the output level transition threshold

Features:

Wide detecting scope
Stable and long life
Fast response and High sensitivity
Analog and Digital Outputs
Trigger Level configuration Potentiometer

Specifications:

Model: FC-22-A
Operating voltage: DC 5V
Analog Output (AO): 0~5V analog output voltage
Digital Output (DO): 0V or 5V output
Configuration: Through Potentiometer (adjusts the output level transition)
Preheat Duration: 20s