MQ-4 Gas Sensor Module

MQ-4 Gas Sensor Module

The MQ-4 Gas Sensor Module is a highly sensitive and reliable device engineered to detect methane (CH₄) and natural gas concentrations in the air. Employing a gas-sensitive semiconductor sensor, this module delivers exceptional sensitivity to methane, ensuring rapid response and recovery times. It serves as a critical component in gas leak detection systems, industrial safety applications, environmental monitoring setups, and smart home devices.

Features:

• The gas sensing material used in the MQ-4 gas sensor is tin dioxide (SnO2) with low conductivity in clean air.
• It adopts high quality double panel design with power indication and TTL signal output indication
• It has DO switch signal (TTL) output and AO analog signal output
• The TTL output valid signal is low. (When the output is low, the signal light is on, it can be directly connected to the MCU or relay module)
• The voltage of the analog output, the higher the concentration, the higher the voltage.
• It has good sensitivity to gas and natural gas detection.
• there are four screw holes for easy positioning;
• product dimensions: 32 (L) * 20 (W) * 22 (H)
• has a long service life and reliable stability
• quickly response recovery characteristics

The digital output D0:

With the help of the potentiometer placed on the reverse side of the board, set is the threshold above which the output D0 is changed from a high to a low status. The output D0 can be linked directly with a microcontroller or commissioning set, including Arduino, or for example, with a module of a buzzer which will signal too low or high level of gassing the air.

Analog output A0:

The sensor has an analog output A0 which must be connected to the pin of the converter A/D (of analog input in Arduino). This will allow you to measure the proportional voltage signal and more accurately determine the concentration.

Pin Configuration:

• VCC: Power supply input (5V DC).

• GND: Ground.

• AO: Analog output, providing a voltage signal proportional to gas concentration.

• DO: Digital output, delivering a high or low signal based on the set threshold.