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by hrez
1237 days ago
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If you're like me and only looking for CO2 monitor, here is a short story. I was researching all the sensors and kits and was narrowing down on AirGradient actually. Per my research the best last gen CO2 sensors are from swiss Sensirion SCD4x series. So I started looking how to build something on it etc. While poking around, by pure chance I saw that Sensirion makes SCD4x-CO2-Gadget which is SCD41 sensor with LED indicator and BLE and powered by USB the size of flash drive. https://sensirion.com/products/catalog/SCD4x-CO2-Gadget/ So, you can just stick it in USB charger anywhere and either use visuals or a mobile app that will show the number or import data for a chart.
All for $60 from official Sensirion dealer like digikey. I don't mean to sound like an Ad, but it's the best sensor as far as I know, for least cost and nothing to solder (perhaps a negative for some :)
No affiliation. |
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You don't have control over calibration however, it's set to auto. So you need to expose it to outside air every 7 days or it will drift. The good news that a drift should be automatically fixed in just a few minutes after you take it outside.
If you live in a high co2 area, the ppm values will not be accurate. But relative measurements will be. And you can just add the difference if you know it to any number you see.