MQ-4 Methane Gas Sensor Module

The MQ-4 Gas Sensor Module is designed to detect methane (CH₄) and natural gas in the environment. It is commonly used in gas leakage detection systems, safety monitoring devices, and industrial gas sensing applications. The module provides both analog and digital outputs, making it easy to interface with microcontrollers such as Arduino, ESP8266, and ESP32. It includes an onboard comparator and adjustable potentiometer for setting the detection threshold. Due to its reliable gas sensing capability, the MQ-4 module is widely used in IoT projects, smart home safety systems, and educational electronics experiments. Key Features Detects methane (CH₄) and natural gas Adjustable sensitivity using onboard potentiometer Analog and digital output signals Onboard LED indicators Easy interface with microcontrollers Suitable for Arduino and IoT projects Technical Specifications Parameter Value Sensor Type MQ-4 Gas Sensor Operating Voltage 5V Detectable Gas Methane (CH₄), Natural Gas Output Type Analog and Digital Comparator LM393 Preheat Time ~20 seconds Interface Pins VCC, GND, DO, AO Pin Configuration Pin Description VCC Power Supply (5V) GND Ground DO Digital Output AO Analog Output What’s in the Box 1 × MQ-4 Gas Sensor Module Ideal For Gas leakage detection systems Home safety monitoring Industrial gas detection Arduino and IoT projects Educational electronics experiments