[Introduction]：SM01-CH4A methane module adopts semiconductor sensor and has the basic functions of household gas leakage alarm; it provides digital signal and status indication output by UART, digital signal output by buzzer, relay and solenoid valve, and supports the reset of alarm value. set up. It can be used for the development of the whole machine of household gas leakage alarms, as well as the detection components for gas leakage of household gas equipment.