The MQ-7 sensor module is built to accurately detect carbon monoxide gas levels in indoor and industrial environments. It requires only a single analog input, making it compatible with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, PIC, and other microcontroller platforms.

With its operating current of 150mA, the sensor uses a heating cycle to enhance sensitivity and ensure precise gas concentration measurement. It is perfect for projects involving air quality monitoring, CO alarms, smart home safety automation, fire detection systems, vehicle exhaust monitoring, mining safety systems, boiler room monitoring, and ventilation control setups.

The MQ-7 is widely used due to its affordability, stable output, and high sensitivity specifically targeted at detecting carbon monoxide, ensuring early warning in environments prone to harmful gas buildup.

Features:

• High sensitivity to carbon monoxide (CO) gas.

• Detects CO concentration from 10 ppm to 10,000 ppm.

• Operates on 5V for easy integration with most development boards.

• Single analog output for real-time gas concentration measurement.

• Stable and reliable semiconductor sensor element.

• Suitable for home, industrial, laboratory, and automotive applications.

• Wide working temperature range: -10°C to +50°C.

• Long lifespan and cost-effective for continuous air quality monitoring.

• Compact module design ideal for embedded systems and IoT devices.

• Strong response and recovery time for timely detection.

• Useful for CO alarm systems, ventilation control, and safety monitoring.

How to Use:

• Power the module using a stable 5V DC supply.

• Connect the analog output (A0) to your microcontroller’s ADC pin.

• Allow the sensor to warm up for accurate readings.

• Use calibration in clean air before deployment.

• Monitor analog values to determine CO concentration levels.

• Integrate with alarms, relays, or IoT dashboards for real-time warnings.

• Install in areas where CO accumulation is likely, such as kitchens, garages, boiler rooms, and workshops.

Product Instructions:

• Avoid exposure to corrosive gases, dust, and liquids.

• Ensure proper airflow for consistent measurement.

• Do not expose the sensor to high concentrations for long periods.

• Use proper ventilation and avoid installing directly beside fans.

• Allow periodic recalibration for long-term accuracy.

• Install away from extreme heat sources to avoid false readings.

Specifications:

• Operating Voltage: 5V

• Operating Current: 150mA

• CO Detection Range: 10–10,000 ppm

• Operating Temperature: -10°C to +50°C

• Sensor Type: Semiconductor CO sensor

• Sensitivity: High sensitivity to carbon monoxide

• Output Type: Analog

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