MQ4 Gas Sensor

The MQ4 Gas Sensor Module is a highly sensitive sensor used for detecting methane (CH₄) and natural gas in the air. It is widely used in gas leak detection systems, safety monitoring devices, and IoT-based home automation projects. Built using SnO₂ (tin dioxide) as the sensing material, the MQ4 sensor has low conductivity in clean air but increases in conductivity as methane gas concentration rises. It supports both analog and digital outputs, making it easy to interface with Arduino, Raspberry Pi, ESP32, and other microcontroller platforms. The sensor features fast response, adjustable sensitivity, and long-term stability, making it ideal for both industrial and DIY applications.

Key Features:

• Detects methane (CH₄) and natural gas

• High sensitivity to methane and propane

• Fast response and quick recovery

• Analog and digital output options

• Adjustable sensitivity via onboard potentiometer (module version)

• Compatible with Arduino, Raspberry Pi, and ESP8266/ESP32

• Stable and long-lasting performance

• Easy to use and integrate

Specifications:

• Model: MQ4 Gas Sensor

• Gas Detected: Methane, natural gas, and propane

• Operating Voltage: 5V DC

• Detection Range: 200 – 10,000 ppm (methane)

• Load Resistance: Adjustable

• Heater Voltage: 5V ± 0.2V

• Sensitivity: High to methane, low to alcohol and smoke

• Response Time: < 10 seconds

• Preheat Time: 20 seconds

• Operating Temperature: -10°C to +50°C

• Output Type: Analog & Digital

• Dimensions: Approx. 32mm x 22mm x 27mm (module form)