MQ-2 Smoke Hydrogen Propane Gas Sensor Module

The MQ2 Gas Sensor Module is designed to sense the presence of various gases in the surrounding air. It operates by changing its resistance based on gas concentration, providing an output signal that reflects the detected levels. This makes it suitable for monitoring gas presence in different environments.

Features

• Sensitive to LPG, propane, and hydrogen
• Output voltage increases as gas concentration increases
• Fast response and recovery
• Includes boost circuit
• Adjustable sensitivity
• Signal output indicator

Pin Configuration

• For Module:
  1. Vcc: Powers the module, typically +5V
  2. Ground: Connect to system ground
  3. Digital Out: Digital output (use the potentiometer to set threshold)
  4. Analog Out: Outputs 0–5V analog voltage proportional to gas intensity
• For Sensor:
  1. H-pins: Of the two H pins, one connects to supply and the other to ground
  2. A-pins: A and B pins are interchangeable; these are tied to supply voltage
  3. B-pins: A and B pins are interchangeable; one acts as output while the other is pulled to ground

Applications

• Gas leakage detection
• Home and industrial gas monitoring systems