Board color may not be black as shown in the image and the chip antenna could change to a different type

This project has evolved over the last few months ending in a board the same size as a 1.69" TFT lcd. A male USB-C connector allows it to plug into a usb-c wall charger with the SCD40 co2 sensor off to one side. Programming can be done by plugging the board into the side of a laptop. If a cable is used then a usb-c female to female adater is needed. The board has two momentary pushbuttons on the top if you wish to use them using your own code. The board ships with my own sketch that is quite buggy but works for my own use. This is an open source project with cad files and code available. Feel free to modify and improve the sketch for your own needs. This board is supported only by a surface mount usb-c connector and is very, very fragile. Any push from any angle while it is plugged into the charger will rip off the connector. Buyer beware