MQ-4 Methane Gas Sensor Module for Ardui...

MQ-4 Sensor Description:
MQ-4 gas sensor sensitive material used in clean air conductivity is lower tin dioxide (SnO2). When the sensor is present in the environment in which the combustible gas , the sensor's conductivity increases with the concentration of combustible gases in air increases . Using a simple circuit can be converted to the change in conductivity of the gas concentration with the corresponding output signal. MQ-4 methane gas sensor for high sensitivity, propane , butane and has a good sensitivity. The sensor can detect a variety of flammable gases, especially natural gas , is a low-cost sensors for a variety of applications .

Module Applications:
For home or factory methane gas , natural gas and other monitoring devices to test natural gas, methane 300 to 10000ppm;

Module Features :
1 , using high-quality dual-panel design, with power indicator and TTL signal output instructions ;
2, with a DO switch signal (TTL) output and AO analog signal output ;
3, TTL output valid signal is low . ( When the output low signal light can be directly connected microcontroller or relay module )
4 , the analog output voltage , the higher the concentration the higher the voltage .
5 , methane , natural gas has better detection sensitivity.
6 , there are four screw holes for easy positioning ;
7 , Product Dimensions : 32 (L) * 20 (W) * 22 (H)
8, with a long service life and reliable stability
9 , rapid response and recovery characteristics

Electrical properties:
Input voltage: DC5V power ( current ): 150mA
DO output : TTL digital 0 and 1 ( 0.1 and 5V)
AO output :0.1-0 .3 V ( relatively clean ) , the highest concentration of voltage around 4V
Special note : The sensor is powered, needs to warm up around 20S , measured data becomes stable , the sensor fever is a normal phenomenon, because the internal heating wire , if hot is not normal.

Wiring:
1, VCC: positive power supply (5V)
2, GND: tied to power supply
3, DO: TTL switching signal output
4, AO: analog output