DFRobot released its latest high-precision analog infrared arduino CO2 sensor. The effectively measuring range is from 0 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!
MH-Z19C NDIR infrared gas module is a common type, small size sensor, using non-dispersive infrared (NDIR) principle to detect the existence of CO2 in the air, with good selectivity, non-oxygen dependent and long life. Built-in temperature compensation; and it has UART output and PWM output.