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

SKU: SEN0159


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"Greenhouse Effect"ط¢آ is melting the Earth 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 lovely engineer.


This is the firstCO2 sensor in the Arduino market. ط¢آ The output voltage of the module falls as the concentration of the 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), ط¢آ a digital signal (ON/OFF) will be released.


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

To ease the difficulty of using this CO2 sensor, ط¢آ aط¢آ Gravityط¢آ Interface is adapted to allow plug&play. ط¢آ Theط¢آ Arduino IO expansion shieldط¢آ is the best match for this CO2 senor connecting to yourط¢آ Arduinoط¢آ microcontroller.ط¢آ 

This is an electrochemical Arduino-based CO2 sensor, it is suitable for qualitative analysis. There are other Infrared CO2 sensors, which could make aط¢آ quantitative analysis.

Gravity: Analog Infrared CO2 Sensor For Arduino (0~5000 ppm), high precision, apply to Arduino and other microcontrollers with ADC function.

Gravity: UART Infrared CO2 Sensor (0-50000ppm), wide range, apply toط¢آ Arduino,Raspberry Pi and other microcontrollers with UART function.

Gravity CO2 Sensor Selection Guide
Product Name Gravityط£آ¯ط¢آ¼ط¥طŒAnalogElectrochemistry CO2 Sensor Gravityط£آ¯ط¢آ¼ط¥طŒAnalog IR CO2 Sensor Gravityط£آ¯ط¢آ¼ط¥طŒUART IRCO2 Sensor
SKU SEN0159 SEN0219 SEN0220
Operation Voltage 3.7¾5V 4.5ط£آ¯ط¢آ½آ¾5.5V 4.5ط£آ¯ط¢آ½ط¥آ¾5.5V
Gravity: Analog
3P Header Digital Output(Alarm):0آ¾VCC Level
Gravity: Analogط¢آ 
(Analog Output 0.4ط£آ¯ط¢آ½ط¥آ¾2V)
Gravity: UART
(0ط£آ¯ط¢آ½ط¥آ¾3.3V Level)
Measurement Principle
Solid electrolyte battery principle¼
NDIR(non-dispersive infrared) NDIR(non-dispersive infrared)
Measurement Range 0¥آ¾10000 ppm 0¯آ¾5000 ppm 0ط£آ¯ط¢آ½ط¥آ¾50000 ppm
Accuracy ¢آ±100ppm@400ppm ±(100ppm + 6% readings) ط¢آ±(100ppm + 6% readings)
Response Time <20s <90s <30s
Average Power <1W <430mW@5V <430mW@5V
Operation Temperature -20 0آ¯آ¢أ¢â‚¬â€ ¢â‚¬â€چط¦â€™ط£آ¯ط¢آ½ط¥آ¾50ط£آ¢أ¢â‚¬â€چط¦â€™
Operation Humidity 0آ¾95% RH (No condensation) 0آ½¾95% RH (No condensation) 0ط£آ¯ط¢آ½ط¥آ¾95% RH (No condensation)
Lifespan >1 years >5 years >5 years
32*42 mm 37*69 mm 21*27.1 mm
1.Large Range
2.Adjustable Alarm Threshold
3.Fast Response
4.Analog Output
1.High Accuracy
2.Long Lifespan
3.Auto Temperature Compensation
4.Water Vapor Interference Resistance
5.Analog Output
1.High Accuracy
2.Large Range
3.Long Lifespan
4.Auto Temperature Compensation
5.Water Vapor Interference Resistance
6.3.3V UART Output


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