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Detailed Description:

Protect your environment with the versatile and reliable MQ-2 Gas Sensor Module, an essential component for detecting a wide range of combustible and hazardous gases. This sensor is highly sensitive to common air pollutants and flammable gases like LPG, propane, hydrogen, methane, carbon monoxide, and smoke, making it an all-in-one solution for building comprehensive safety systems. The sensor works on the principle of a tin dioxide (SnO2​) semiconductor, which changes its electrical conductivity in proportion to the gas concentration, providing a stable and accurate measurement.

The module’s strength lies in its dual output functionality. For projects that require precise, real-time data, the analog output (AO) provides a continuous voltage signal that is directly proportional to the gas concentration. This is ideal for logging data and displaying gas levels on an LCD screen. For a simple and immediate alert system, the digital output (DO) provides a straightforward HIGH/LOW signal. The sensitivity threshold for this digital output can be easily adjusted using the on-board potentiometer, allowing you to customize the trigger point to activate a buzzer or LED alarm when a specific level of gas is detected.

Operating on a standard 5V DC supply, the MQ-2 module is fully compatible with popular microcontrollers like Arduino, ESP32, and Raspberry Pi. It is widely used in a variety of safety-critical applications, including domestic and industrial gas leak detectors, portable fire alarms, and educational projects. With its fast response time, stable performance, and broad detection scope of 200 to 10,000 ppm, the MQ-2 Gas Sensor Module is a low-cost, high-performance solution. Whether you are a student, hobbyist, or a professional developer, this sensor is an indispensable component for any project, that requires dependable and accurate gas and smoke detection.

The MQ-2 Gas Sensor Module is designed to detect the presence of gases such as LPG, methane, propane, hydrogen, smoke, and alcohol in the air. It features both analog and digital outputs, allowing it to be used for quantitative measurements or as a threshold-based detector.

The module uses the MQ2 sensing element, which has fast response time and high sensitivity. It is widely used in home security systems, gas leak alert devices, industrial safety monitors, and IoT-enabled environmental sensing.

An onboard potentiometer allows the user to set the trigger threshold for the digital output.

Key Features:

• Detects a wide range of flammable and combustible gases

• Suitable for LPG, propane, methane, hydrogen, alcohol, and smoke

• Analog and digital output pins

• Onboard sensitivity adjustment potentiometer

• Easy interfacing with Arduino, ESP32, Raspberry Pi, STM32

• Long life, stable output, and fast response

• Compact design ideal for smart home and IoT applications

Technical Specifications:

How to Use:

1. Connect VCC (5V), GND, and A0 (analog) / D0 (digital) pins to your microcontroller.

2. Wait for the sensor to warm up (1–2 minutes).

3. Use analog value for gas concentration or D0 as a threshold trigger.

4. Adjust the threshold using the potentiometer.

5. Integrate readings with your alarm, relay, or IoT system.

Applications:

• Home & industrial gas leak detection

• Smart kitchen or cooking gas safety systems

• Smoke detection in fire alarm systems

• IoT-enabled air quality and gas monitors

• Breath alcohol testing devices

• Portable or wearable gas sensors

• STEM education kits & engineering projects

Package Includes:

• 1 x MQ-2 Gas Sensor Module (LPG/Smoke/Methane/Alcohol Detector)