Description
The MQ-7 CO Gas Sensor is a high-sensitivity module designed to detect carbon monoxide levels in the air. It features both analog and digital outputs, making it easy to interface with Arduino, ESP32, and Raspberry Pi.
The sensor uses a built-in heating element with a cycling method (low and high temperature) for accurate CO detection. It includes an onboard potentiometer for threshold adjustment and an LED indicator for digital alerts.
Commonly used in home CO detectors, industrial safety alarms, and IoT-based environmental monitoring projects.
Key Features
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Detects carbon monoxide (CO)
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Analog and digital output options
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Adjustable sensitivity via onboard potentiometer
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Digital LED indicator for gas alerts
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High sensitivity and fast response time
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Compatible with Arduino, ESP32, Raspberry Pi
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Long service life and reliable performance
Specifications
| Feature | Details |
|---|---|
| Operating Voltage | 5V DC |
| Detection Range | 10–10,000 ppm CO |
| Output | Analog voltage, Digital HIGH/LOW |
| Heater Voltage Cycle | 1.5V (90 sec), 5V (60 sec) |
| Preheat Time | 24–48 hours (first use) |
| Current Consumption | ≤150 mA |
| Operating Temperature | -10°C to 50°C |
| Dimensions | 32 × 20 × 22 mm |
Applications
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Carbon monoxide leak detection
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Home and industrial CO safety alarms
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Air quality monitoring systems
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IoT-based environmental sensing
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Smart home safety projects
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Automotive CO monitoring
Compatible Boards / Circuits
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Arduino (Uno, Nano, Mega)
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ESP32 / ESP8266
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Raspberry Pi (via ADC for analog output)
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Relay modules, alarms, buzzers, and display systems
Reviews
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