MQ-4 Methane Gas Sensor module Graphene-based Gas/Vapor Sensors Gas Detection (MQ 4)

Graphene-based gas and vapor sensors have been attached much attention in recent years due to their variety of structures, unique sensing performance, room-temperature working conditions, and tremendous application prospects, etc.

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 good sensitivity. The sensor can detect a variety of flammable gases, especially natural gas, is a low-cost sensor for a variety of applications.

Wiring:

VCC: positive power supply (5V); GND: power supply is negative; DO: TTL switching signal output; AO: analog signal output

Specification:

• MQ-4 MQ4 gas methane sensor

• Input voltage : DC5V Power consumption ( current ): 150mA DO output : TTL digital 0 and 1 ( 0.1 and 5V) AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V

• Using the 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 )

• Analog output voltage with a higher concentration of higher voltage There are four screw holes for easy positioning. Has a long life and reliable stability Rapid response and recovery characteristic

• Special note: After the sensor is powered, the sensor needs to warm up around the 20S to achieve stability in data measurement, the sensor does get heated up it is a normal phenomenon, because of the internal heating wire.