DFRobot Gravity Analog CO2 Gas Sensor For Arduino (MG-811 Sensor)


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SKU: 1356230
  1. Model: DFRobot Gravity Analog CO2 Gas Sensor
  2. Heating Voltage: 6.0±0.1 V
  3. Heating Resistor: 30.0±5%Ω
  4. Heating Current: at 200mA
  5. Heating Power: 1200mW



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Brand: DF Robot
Category: Gas and Dust Sensor

The greenhouse Effect” is melting the Earth’s ice core every minute and creating dangerous icebergs. By knowing the exact concentration of CO2(Carbon Dioxide), we can do something to reduce the CO2 and to protect our Earth. Here is the Arduino-based CO2 sensor designed by DFRobot’s lovely engineer. This is the first CO2 sensor in the Arduino market.  The output voltage of the module falls as the concentration of CO2 increases. The potentiometer onboard is designed to set the threshold of voltage. As long as the CO2 concentration is high enough (the voltage is lower than the threshold),  a digital signal (ON/OFF) will be released.

It has an MG-811 sensor module which is highly sensitive to CO2 and less sensitive to alcohol and CO, low humidity & temperature dependency.  The onboard heating circuit brings the best temperature for the sensor to function. Internal power boosting to 6V for heating sensor best performance. This sensor has an onboard conditioning circuit for amplifying the output signal.

Connection Diagram:

Useful Link:




  1. Good sensitivity and selectivity to CO2
  2. Low humidity and temperature dependency
  3. Long stability and reproducibility

Package Includes:

1 x DFRobot Gravity Analog CO2 Gas Sensor For Arduino (MG-811 Sensor)

SKU: 1356230 Category:
Heating Resistor


Heating Current: at


Heating Power


Operating Temperature



32x42mm (1.26×1.65″)

Shipping Weight 0.004 kg
Shipping Dimensions 4 × 4 × 2 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Reimbursement or replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China