MQ-4 Methane Gas Sensor Module

The MQ-4 Methane Gas Sensor Module is a highly sensitive and reliable sensor designed for detecting methane (CH₄), natural gas, and combustible gas concentrations in the air. It uses a SnO₂ (tin dioxide) semiconductor layer whose resistance changes proportionally to the gas concentration, providing accurate and consistent readings for gas monitoring applications.

Operating at 5V DC, this sensor module provides both analog and digital outputs, making it fully compatible with Arduino, ESP32, ESP8266, Raspberry Pi, and other microcontroller platforms. The built-in LM393 comparator chip allows users to set a detection threshold via the adjustable potentiometer, enabling the digital output to trigger alarms or relays when the methane level exceeds the set value.

The MQ-4 sensor is known for its high sensitivity to methane and natural gas while maintaining a low sensitivity to other gases such as smoke and alcohol vapors. This makes it an excellent choice for gas leakage alarms, home safety systems, and industrial gas detection projects.

When integrated into IoT-based systems, the MQ-4 can transmit real-time gas readings for safety monitoring or automation. With a robust design and easy-to-use interface, it is a must-have for makers, engineers, and students working on smart gas detection and home safety devices.

Get your MQ-4 Methane Gas Sensor Module today from eleberric.com, Sri Lanka’s trusted store for Arduino modules, gas sensors, and IoT components.

Specification

• Model: MQ-4

• Operating Voltage: 5V DC

• Sensor Type: Semiconductor (SnO₂)

• Detection Range: 200 ppm to 10,000 ppm (CH₄)

• Output: Analog (AO) and Digital (DO)

• Sensitivity: High to methane, propane, and natural gas

• Preheat Time: 20 seconds (typical)

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

• Dimensions: Approx. 32mm × 22mm × 27mm

• Weight: Approx. 25g

Key Features

• High sensitivity to methane and natural gas

• Dual output (Analog and Digital) for flexible integration

• Adjustable detection threshold using potentiometer

• Fast response and recovery time

• Onboard power and signal indicator LEDs

• LM393 comparator for stable digital triggering

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

Applications

• Methane and natural gas leak detection

• Home and industrial gas monitoring systems

• Smart IoT gas detection devices

• Gas leak alarm systems

• Environmental monitoring projects

• Educational and Arduino DIY experiments