MQ2 Gas Sensor Module for Smoke, LPG, Alcohol Detection
MQ2 Gas Sensor Module – Smoke, LPG, and Alcohol Detection
The MQ2 gas sensor module is a versatile sensor for detecting combustible gases such as LPG, smoke, alcohol, propane, hydrogen, and methane. It provides an analog voltage output that varies with gas concentration, making it ideal for DIY air quality monitors, gas leak alarms, and safety systems. With high sensitivity and fast response, it is a reliable choice for both hobbyist and educational projects.
Key Specifications
| Specification | Value |
|---|---|
| Operating Voltage | 5V DC |
| Detecting Concentration | 200-10000ppm (combustible gas) |
| Analog Output | 0-5V, proportional to gas concentration |
| Preheat Duration | Over 20 seconds |
| Interface | Analog pin + digital threshold (comparator) |
| Dimensions | 32mm x 22mm x 27mm |
What You Can Build With This
- Gas leak detector for kitchens or industrial spaces
- Smoke alarm system for fire safety
- Portable breathalyzer for alcohol detection
- Air quality monitoring station with data logging
Compatibility
This module operates at 5V and works seamlessly with Arduino boards (Uno, Nano, Mega) and Raspberry Pi (with an ADC if needed, as Pi lacks analog inputs). It outputs an analog signal (0-5V) that can be read by any analog input pin. For 3.3V systems, a level shifter is recommended to avoid damage.
Wiring Notes
Connect VCC to 5V, GND to ground, and the analog output (A0) to an analog input pin on your microcontroller. Let the sensor preheat for 20-30 seconds before taking readings. Avoid operating in high-humidity or dusty environments for accurate measurements.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino Uno?
Yes, the MQ2 sensor module works directly with Arduino Uno. Connect the analog output to any analog pin and use a simple sketch to read gas concentration levels.
How do I calibrate the MQ2 sensor?
Calibration involves exposing the sensor to a known gas concentration and adjusting the threshold in your code. For general use, you can use pre-calibrated values from the datasheet and fine-tune based on ambient air readings.
Can it detect carbon monoxide?
The MQ2 is sensitive to many combustible gases, including carbon monoxide (CO), but it is not specific to CO. For dedicated CO detection, consider the MQ7 sensor.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items