MQ-2 Flammable Gas and Smoke Sensor Module

The MQ2 Flammable Gas and Smoke Sensor Module is a highly sensitive and reliable device designed for detecting a range of combustible gases and smoke in various environments. This module is widely used in safety applications, environmental monitoring, and IoT projects due to its affordability, ease of use, and versatility.

Key Features:

• Gas Detection Range: Capable of detecting LPG, methane, butane, propane, hydrogen, alcohol, and smoke, making it suitable for multiple applications.
• Dual Output Modes:
  • Analog Output: Provides a proportional voltage output that varies according to the concentration of gases detected, useful for continuous monitoring.
  • Digital Output: Adjustable threshold output that triggers a digital signal when gas concentration reaches a set level, allowing for threshold-based alerts.
• High Sensitivity: Detects gases at concentrations from approximately 300 ppm to 10,000 ppm, ensuring responsiveness in real-time applications.
• Power Requirements: Operates on a standard 5V DC, compatible with most microcontroller platforms like Arduino, Raspberry Pi, and other development boards.
• Long Service Life and Stable Output: Designed for long-term use, with minimal maintenance and stable output characteristics over time.

Working Principle:

The MQ2 sensor employs a heating element and a metal-oxide semiconductor (MOS) material to detect gas. When the sensor is exposed to gases, the material’s resistance changes, which results in a varying output voltage. This allows for real-time monitoring of gas concentration levels.