“Have you ever stared at the ceiling and found it hard to fall asleep? Try this ESP8266 powered projector!
Once in a while I found it hard to fall asleep, and stared at the ceiling for a long time. I wished there can be some random patterns showing on the ceiling to help me relax. It certainly should not be a real projector that is too bright, nor a smartphone that can only distract.
I tried to make such a projector using an ESP8266 and a small LCD screen. The LCD screen emits a small amount of light, and works great when projected onto the ceiling, without breaking the dark environment.
A contex lens with 25mm diameter and 45mm focal length is used. This is the same as the ones used for Google Cardboards. I could not find a good enclosure, so I designed one and printed using my 3D printer.”