Public Ideas — Hardware startups and makers: let's co-build your Arduino/ESP32 prototype

maybe a little sensor by the door that checks for your phone, wallet and keys? check out Hunter’s post

A small greenhouse operator could be a useful partner for a first product: they know exactly which temperature or watering failures cost them money. Build one sensor-and-alert prototype around that problem, with them testing it in daily use. You get a real operating environment and a potential first customer; they get something designed around their actual setup.