MQ-4 Natural Gas Methane Gas Sensor Module
Using high-quality dual-panel design, with power indicator and TTL signal output instructions ;
The switching signal having a DO (TTL) output and analog output AO ;
TTL output valid signal is low . ( Low-level signal when the output light can be directly connected to the microcontroller or relay module ) The higher the voltage , the concentration of the analog output voltage is higher. For methane, natural gas has a good detection sensitivity. There are four screw holes for easy positioning ; Dimensions : 32 (L) * 20 (W) * 22 (H) Rapid response and recovery characteristics Instruction of Wiring:
VCC: positive power supply (5V)
GND: power supply is negative
DO:TTL switching signal output
AO: analog signal output