Gravity: Arduino CO2 Gas Sensor

The Gravity CO2 Gas Sensor uses an MG-811 electrochemical sensing element to detect carbon dioxide concentration in the air. The output voltage decreases as CO2 concentration increases, and an onboard potentiometer lets you set a threshold for a digital on/off signal output.

An onboard heating circuit with internal voltage boosting to 6V ensures the sensor operates at its optimal temperature. The Gravity analog interface allows plug-and-play connection to compatible Arduino expansion shields. Note that this is an electrochemical sensor suited to qualitative CO2 analysis — for quantitative measurement, consider an infrared CO2 sensor.

Key Features

• Sensor – MG-811 electrochemical CO2 sensing element
• Operating Voltage – 5V
• Interface – Gravity analog + one digital threshold output
• Sensitivity – Highly sensitive to CO2, low sensitivity to alcohol and CO
• Onboard Heating Circuit – Internal 6V boost for optimal sensor temperature
• Signal Conditioning – Onboard amplification circuit for output signal
• Low Dependency – Minimal humidity and temperature influence
• Immersion Gold PCB – High-quality surface finish
• Dimensions – 32 × 42mm

Ideal For

• Air quality monitoring
• Fermentation process control
• Indoor CO2 concentration detection

Package Contents

• 1× Gravity CO2 gas sensor

Resources

• Wiki (DFRobot)
• Schematic (PDF)
• PCB layout (PDF)
• MG-811 datasheet (PDF)