The concentration of carbon dioxide (0.03% usually) is related to daily life. Recently, there’s a study showing that the atmospheric CO2 content has reached 0.0385% (385 ppm) which is the highest value since 2.1 million years. The raise of atmospheric CO2 content to some extent results in global climate change. How to accurately measure carbon dioxide gas concentration is becoming a universal research topic.

DFRobot released its latest high-precision infrared Arduino CO2 sensor. The effectively measuring range is from 400 to 5000ppm. This sensor is based on non-dispersive infrared (NDIR) technology and has good selectivity and oxygen-free dependency. Besides, its service life could up to 5 years!

In addition, this Gravity: Infrared CO2 Sensor For Arduino (400~5000 ppm) is a high-performance sensor that combines technology of mature infrared absorption gas detection with precision optical circuit design as well as sophisticated circuit design. It has characteristics such as high sensitivity, high resolution, low power consumption, fast response, anti-water vapor interference, no poisoning, high stability, and long life.

This Gravity: Infrared CO2 Sensor is able to directly compatible with the DFRobot Arduino IO expansion board thanks to its external DFRobot Gravity interface. This character simplify the use of the sensor as it is plug and play and no need additional wiring.

This CO2 Sensor could be widely used in HVAC, indoor air quality monitoring, industrial process, and security protection monitoring, agriculture, and animal husbandry production process monitoring.

DFRobot provides detailed tutorials and code, please check the product wiki.

In addition, we also have a 0~50000 ppm wide-range infrared sensor with Gravity UART interface, Compatible with Arduino, Raspberry Pi, and other microcontrollers: Gravity: UART Infrared CO2 Sensor (0~50000ppm).

Infrared CO2 Sensor For Arduino Tutorial:

ESP32 Arduino: Using an infrared CO2 sensor

ESP32 Arduino: Temperature, humidity and CO2 concentration web server

Gravity CO2 Sensor Selection Guide
Product Name	Gravity：Analog Electrochemistry CO2 Sensor	Gravity: Infrared CO2 Sensor For Arduino	Gravity：UART IR CO2 Sensor
SKU	SEN0159	SEN0219	SEN0220
Operation Voltage	3.7～5V	5V	4.5～5.5V
Output	Gravity: Analog (Analog2.7～4.1V) + 3P Header Digital Output(Alarm):0～VCC Level	Gravity: PWM	Gravity: UART (0～3.3V Level)
Measurement Principle	Electrochemistry （Solid electrolyte battery principle）	NDIR(non-dispersive infrared)	NDIR(non-dispersive infrared)
Measurement Range	0～10000 ppm	400～5000 ppm	0～50000 ppm
Accuracy	±100ppm@400ppm	±(100ppm + 6% readings)	±(100ppm + 6% readings)
Response Time	<20s	T90<120s	<30s
Average Power	<1W	<430mW@5V	<430mW@5V
Operation Temperature	-20℃～50℃	-10℃～50℃	0℃～50℃
Operation Humidity	0～95% RH (No condensation)	0～95% RH (No condensation)	0～95% RH (No condensation)
Lifespan	>1 year	>5 years	>5 years
Dimension (PCB)	32*42 mm	37*69 mm	21*27.1 mm
Features	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	1.High Accuracy 2.Large Range 3.Long Lifespan 4.Auto Temperature Compensation 5.Water Vapor Interference Resistance 6.3.3V UART Output