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Oct 09, 2016· I have a MHZ19 CO2 sensor, according the datasheet I can obtain PPM values via UART and PWM. The difference between both method is the limit in the CO2 concentration, where UART I should have readings between 05000ppm, and via PWM I should have readings between 02000ppm.
This is the latest MHZ19 highprecision infrared CO2 sensor. The effectively measuring range is from 400 to 5000ppm. It is a small size sensor and based on nondispersive infrared (NDIR) technology and has good selectivity and oxygenfree dependency.
CO2 sensor. There are numerous CO2 sensors available, a nonexhaustive follows here: NetAtmo Home Coach (100 EUR) measures VOC (volatile organic compounds) as proxy for CO2, not CO2 directly. It''s also relatively expensive. S8 SenseAir similar to MHZ19, but more expensive. MHZ14 appears to be an older version of MHZ19.