MQ4 METHANE SENSOR

The MQ4 methane gas sensor detects the presence of methane (CH4) and other natural gases in the air. It operates using a metal-oxide semiconductor (MOS) sensing element that changes resistance when exposed to gas. The sensor provides both analog and digital outputs for easy integration with microcontrollers. It is widely used in gas leak detection systems for homes, industries, and safety applications. The MQ4 has high sensitivity to methane but can also detect small amounts of LPG and alcohol vapors. It operates at 5V and requires a preheating period for stable readings. The module is compact and easy to use with Arduino, Raspberry Pi, and other platforms. It helps prevent accidents caused by gas leaks by providing early detection.