⚠️ 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

Parameter	Specification
Detection Range	20–2000 ppm CO
Operating Voltage	5V DC (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 @ 1.4V (for optimal accuracy)
Response Time	< 30s (to detect CO changes)
Sensor Type	Semiconductor (SnO₂-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)

❗ 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

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