ALLNET Arduino MQ-5 Gas Sensor Module for LPG, Butane, Propane, Methane (ALL-B-5)

Detecting combustible gases in DIY projects often requires a sensor that can reliably monitor multiple gas types without complex circuitry. The ALLNET ALL-B-5 solves this by integrating the MQ-5 semiconductor gas sensor onto a convenient breakout board, ready to interface with Arduino, Raspberry Pi, or other microcontrollers.

Who is it for

This module is ideal for makers, hobbyists, and engineers building gas leak alarms, safety systems, or environmental monitoring stations. It suits projects needing detection of LPG, butane, propane, methane, natural gas, or coal gas.

Main features

• Uses MQ-5 semiconductor gas sensor for broad combustible gas detection
• Provides both analog output (0-5V) and digital TTL output with adjustable threshold
• On-board potentiometer for sensitivity adjustment
• Power and digital output indicator LEDs for easy status checking
• Standard 4-pin header (VCC, GND, DOUT, AOUT) for simple wiring
• Compatible with 5V logic microcontrollers including Arduino, ESP32, and Raspberry Pi

Specifications

• Sensor Model: MQ-5
• Target Gases: LPG, Natural Gas, Butane, Propane, Methane, Coal Gas
• Operating Voltage: 5V DC
• Output Type: Analog (0-5V) & Digital (TTL)
• Detection Range: 300 - 10,000 ppm (LPG/Natural Gas)
• Heater Voltage: 5V DC
• Heater Current: Approx. 150mA
• Response Time: ≤ 10 seconds
• Recovery Time: ≤ 30 seconds
• Operating Temperature: -10°C to 50°C
• Operating Humidity: ≤ 95% RH (non-condensing)

Tips

Allow the sensor to preheat for a few minutes before taking readings for stable output. Calibrate the digital threshold using the potentiometer while exposing the sensor to a known gas concentration. Ensure adequate ventilation during testing.