What options for CO2 sensor?

[richieframe (Richie)]

hell no, that does not actually detect carbon dioxide it detects VOC and fakes a CO2 level

a functional CO2 sensor, literally just the sensor component, costs at least $20 usd, and those are the cheap chinese ones. The SCD30 is the really the best price you can get for an accurate sensor with auto calibration and temp/humidity compensation. Other quality sensors are $100 to $120 (I have checked them all)

For reasons to get the SCD30 over the cheap chinese ones, see this post:

CO2 monitoring with SCD30 sensor and HA integration

There are several reasons to go with the SCD30 over the MH-Z series. Depending on the use none of them may be critically important, but here they are: SCD30: uses 1/2 the power has better accuracy has a longer operational lifespan has 5X higher detection range has onboard humidity compensation has I2C bus in addition to UART has accurate and detailed English documentation I2C bus and up to 10K ppm are the big ones, for home or industrial use these are important, for standalone office ‘t…