@dariosalvi78 Sure, the NO2 sensor we are currently using is made by SPEC-Sensors. Here is a link to the raw sensor's product page. I've attached to this post a PDF of the current (slightly embarrassing, but alas) schematic for the board that acts as the analog front end for the sensor. U2 in the middle of the schematic is a TI LMP91000 chip, everything else should be reasonably clear.
I would love to talk to you more about your small community project, it would be really great if you were to buy and use Air Quality Eggs. There's a lot more to getting useful information out of the sensors than hardware. There's layers of software, and many calibration steps we go through while we build an Egg to make sure you get good quality results from the sensors. If you want to talk more specifically about using Air Quality Eggs for your project, please email support at wickeddevice dot com.
AQEv2_KWJ_Host.SCH.pdf (14.3 KB)
