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We are delighted that the first batch of adventurers received their sensors and that they work ok. This means a sigh of relief that they work. For the earliest users, we offer some explanations:
- The sensors are rather expensive, over $30 USD. We apologize for this, but while we would like to be as low as possible, balancing the risk of international packages, the store commission, and most fatally the high price of the SCD40 sensors, it's difficult to further reduce the price of the entire sensor any further than it already is. We apologize for this, but from time to time, we hope to be able to give something back and do some reasonable manufacturing activities to make the price a little bit more desirable sometimes.
- The temperature sensors are 5-6 degrees warmer relative to the ambient temperature, and due to the heating energy of the ESP32 series, they will always interfere with any temperature sensors within a few centimeters of them, including those carried by the SCD40. We deal with this by providing them as reference temperatures (with Ref) in the debug properties. Some programs think that adding a few degrees of deviation can help to improve this, but in our tests this is not ideal, even when placed in a refrigerator the interference is still outrageous, and then the difference can become 10s of degrees, and an inaccurate temperature is an inaccurate temperature, so we just use it as a reference temperature.
- But this temperature information, due to the corrections needed to calculate CO2, is still informative for the sensor internally.
That's the way it is, dear friends, and we are happy that there are officially more CO2 sensors in the DIY sensor family. They are consistently small, simple and easy to use.