MG811 Carbon Dioxide (CO2) Sensor Module
Accurately measure Carbon Dioxide levels with the MG811 CO2 Sensor Module. This high-sensitivity sensor is specifically designed to detect the concentration of CO2 in the air, making it an essential component for advanced air quality monitoring, environmental science projects, and agricultural automation.
The MG811 is a solid electrolyte sensor that provides a reliable analog voltage output that corresponds to the CO2 concentration (typically from 350 to 10,000 ppm). This breakout board simplifies the use of the MG811 by providing the necessary heater circuit and signal conditioning on a single, easy-to-use module.
Unlike general air quality sensors, the MG811 is highly selective to CO2, making it ideal for applications where specific CO2 measurement is critical, such as monitoring air in crowded rooms, controlling ventilation in greenhouses, or checking fermentation processes.
Key Features:
- Sensor Model: MG811
- Primary Detection: High sensitivity and selectivity to Carbon Dioxide (CO2)
- Output: Analog voltage output
- Onboard Heater Circuit: Provides the stable high temperature required for sensor operation
- Operating Voltage: Typically 6V for the heater, with 5V logic compatibility
- Detection Range: 350 ~ 10,000 ppm CO2
- Stable and Reliable: Designed for long-term air quality monitoring
Applications:
The MG811 sensor is perfectly suited for a range of specialized applications, including indoor air quality monitoring for homes and offices, CO2 concentration control for greenhouses, monitoring fermentation processes in brewing and baking, and for use in HVAC systems to control ventilation.





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