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

📊 Technical Specifications

🔧 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)

❗ 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