MQ-7 Carbon Monoxide / Gas Sensor Module
In Stock
Categories: Environment Sensors
Description
⚠️ Key Features
✔ Specialized CO Detection – Optimized for carbon monoxide (20–2000 ppm) ✔ Dual Output Modes – Analog (0–5V) and Digital (TTL High/Low) ✔ Adjustable Sensitivity – Digital threshold via onboard potentiometer ✔ Heater Cycling – 5V preheat (60s) + 1.4V detection (90s) for accurate readings ✔ 5V Compatible – Works seamlessly with Arduino & other 5V logic devices ✔ Compact & Breadboard-Friendly – Easy prototyping
đź“Š Technical Specifications
| Parameter | Specification |
|---|---|
| Detection Range | 20–2000 ppm CO |
| Operating Voltage | 5V DCÂ (heater cycles between 5V & 1.4V) |
| Analog Output | 0–5V (higher voltage = higher CO concentration) |
| Digital Output | TTL (High/Low) – Adjustable threshold |
| Preheat Time | 60s @ 5V, then 90s @ 1.4VÂ (for optimal accuracy) |
| Response Time | < 30s (to detect CO changes) |
| Sensor Type | Semiconductor (SnOâ‚‚-based) |
🔧 Wiring Guide (Arduino Example)
-
VCC → 5V (Arduino)
-
GND → GND
-
AO (Analog Out) → A0 (for CO concentration readings)
-
DO (Digital Out) → D2 (for threshold-based alerts)
âť— Important:
-
The MQ-7 requires heater cycling (alternating 5V and 1.4V) for accurate CO detection.
-
Use a PWM-controlled circuit or library (e.g., MQ7-Library) for automatic voltage switching.
⚠️ Safety & Usage Notes
-
Not for life-critical systems (use professional CO detectors in homes/offices).
-
Avoid high humidity & alcohol fumes (may cause false positives).
-
Calibrate regularly (expose to clean air before use).
🔍 Applications
✅ Home/Office Safety – Early CO leak detection ✅ Car Exhaust Monitoring – Detect CO in garages/vehicles ✅ Industrial Air Quality – Workplace safety systems ✅ Smart Ventilation – Auto-trigger exhaust fans ✅ Educational Projects – Learn gas sensing principles
