MG811 Carbon Dioxide CO2 Sensor Module

The MG811 Carbon Dioxide (CO₂) Sensor Module is designed to detect and measure carbon dioxide concentration in the air. It is based on a solid electrolyte sensor that provides high sensitivity to CO₂ gas, making it suitable for air quality monitoring and environmental sensing. The module includes onboard signal conditioning circuitry, allowing easy interfacing with microcontrollers and development boards.

Technical Specifications:

• Sensor Type: Solid electrolyte CO₂ gas sensor
• Detectable Gas: Carbon Dioxide (CO₂)
• Detection Range: Approximately 350 ppm to 10,000+ ppm
• Operating Voltage: 5 V DC
• Output Signal: Analog voltage (proportional to CO₂ concentration)
• Heater Voltage: 6 V (typically regulated on module)
• Preheating Time: ≥ 24 hours recommended for stable readings
• Operating Temperature: –10 °C to +50 °C
• Humidity Range: 0% to 95% RH (non-condensing)
• Interface: Analog output, onboard adjustable potentiometer

Features:

• High sensitivity and good selectivity for CO₂ gas
• Long lifespan and stable performance
• Onboard amplifier and signal conditioning circuit
• Adjustable output via potentiometer
• Compatible with Arduino, ESP32, Raspberry Pi (via ADC), and other microcontrollers
• Compact module with mounting holes for easy installation

Applications:

• Indoor air quality monitoring systems
• HVAC and ventilation control
• Greenhouse and agriculture monitoring
• Smart home and building automation
• Environmental monitoring projects
• Educational and research applications