MQ-7 Carbon Monoxide Gas Sensor Module - Compoden India
MQ-7 Gas Sensor Module for Carbon Monoxide
The MQ-7 gas sensor module is designed to detect carbon monoxide (CO) concentrations in the air. It is commonly used in air quality monitors, gas leakage alarms, and portable safety detectors. The module provides an analog output proportional to gas concentration, making it easy to integrate with microcontrollers.
Key Specifications
| Specification | Value |
|---|---|
| Detection Gas | Carbon monoxide (CO) |
| Operating Voltage | 5V DC |
| Detection Range | 20 – 2000 ppm |
| Heater Resistance | 33 Ω ±5% |
| Preheat Time | 2 – 5 minutes (cycle) |
| Output Type | Analog voltage (0 – 5V) |
What You Can Build With This
- Standalone carbon monoxide alarm with buzzer
- Portable air quality monitor with LCD display
- IoT gas leakage detector with notifications
- Smart ventilation controller for enclosed spaces
Compatibility
This module operates at 5V, making it directly compatible with Arduino Uno, Nano, and Mega boards. For 3.3V systems like ESP32 or Raspberry Pi, use a level shifter or voltage divider on the analog output. It pairs well with LCD displays, buzzers, and relay modules for alert systems.
Wiring Notes
Connect VCC to 5V, GND to ground, and AOUT to an analog input pin. The module draws up to 350 mW during heating cycles; ensure your power supply can handle the load. For best accuracy, allow the sensor to preheat for 2–5 minutes before taking measurements. Avoid exposing the sensor to silicon vapors or corrosive gases to prolong lifespan.
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?
Yes, the MQ-7 module works directly with 5V Arduino boards like Uno and Nano. Connect AOUT to any analog pin to read CO levels.
How long does the sensor need to warm up?
Initial preheating takes 2–5 minutes for stable readings. For precise applications, allow 48 hours of continuous operation for complete stabilization.
Can this sensor detect other gases?
It is primarily sensitive to carbon monoxide but may show minor cross-sensitivity to hydrogen, methane, and alcohol vapors. For dedicated CO detection, use in controlled environments.
📦 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.
What you can build with this
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