MQ2 Smoke & Gas Sensor Module (Digital/Analog)

Overview

The MQ2 Smoke & Gas Sensor Module is a versatile gas detection sensor capable of detecting smoke, LPG, propane, methane, hydrogen, and other combustible gases. It features both digital (DO) and analog (AO) outputs, allowing easy integration with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other microcontroller platforms. Equipped with an LM393 comparator and an adjustable sensitivity potentiometer, the MQ-2 is ideal for gas leakage detection, fire alarms, air quality monitoring, and IoT safety projects.

Key Features

• Dual Outputs: Provides both digital (DO) and analog (AO) outputs for flexible interfacing.
• Adjustable Sensitivity: Onboard potentiometer allows precise threshold adjustment for the digital output.
• LM393 Comparator: Ensures reliable digital signal output when gas concentration exceeds set threshold.
• Wide Detection Range: Detects smoke, LPG, propane, methane, hydrogen, alcohol, and other combustible gases.
• Easy Integration: Compatible with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other MCUs.
• Power & Status LEDs: Includes power and output indicator LEDs for easy monitoring.
• Compact Design: Small footprint suitable for breadboard and PCB mounting.

Technical Specifications

• Operating Voltage: 5V DC
• Heater Consumption: ~750mW (heater voltage 5V)
• Detection Range: 300-10,000 ppm (varies by gas)
• Outputs: Digital (DO) + Analog (AO)
• Sensitivity Adjustment: Onboard potentiometer
• Comparator: LM393
• Module Dimensions: ~32mm x 20mm x 22mm
• Weight: ~7g
• Preheat Time: >24 hours for first use, 5 minutes for subsequent uses

Applications & Use Cases

• Gas Leakage Detection: Ideal for home and industrial LPG/propane leak alarms.
• Fire Alarm Systems: Detects smoke early, providing critical warnings.
• Air Quality Monitoring: Monitors indoor air quality for harmful gases.
• IoT Safety Projects: Integrate with ESP8266/ESP32 for remote monitoring and alerts.
• Educational Projects: Perfect for STEM and robotics workshops.
• Industrial Safety: Suitable for detecting combustible gases in workshops and factories.

What's Included

• 1x MQ2 Gas Sensor Module
• 1x MQ2 sensor (pre-soldered on module)
• 1x LM393 comparator circuit (onboard)
• 1x Potentiometer (onboard)
• 1x Pin header (4 pins: VCC, GND, DO, AO)

Compatibility

• Arduino (Uno, Mega, Nano, etc.)
• ESP32
• ESP8266 (NodeMCU, Wemos D1 Mini)
• Raspberry Pi (via ADC or digital GPIO)
• STM32
• 8051, PIC, AVR
• Any microcontroller with 5V logic

MOKWN Recommendation

At MOKWN, we recommend the MQ2 module for hobbyists and professionals alike. For best results, allow the sensor to preheat for at least 5 minutes before calibration. Use the analog output for precise gas concentration readings, and the digital output for simple threshold-based alarms. Pair it with our ESP32 or Arduino starter kits for quick IoT projects. For more advanced gas detection, consider our MQ-135 or MQ-7 modules.