Environmental control system does not work properly unless connected via USB

Hi,
ExpressPCB.

https://www.expresspcb.com/free-cad-software/

Free, uncluttered, no advertisements or limits.

Tom.... :slight_smile:
But I would do a picture of a hand drawn circuit in jpg, png if you are new, then you don't have to look up components, they are all in your mind and hand.