This is a cheap electronic name badge that can be programmed with the arduino ide. I built it for events like barcamps at the attraktor makerspace.
It shows your name and info and if you get bored you can play a game of breakout on it or program it with your own game.
It’s basically a minimal arduino that can be programmed with the arduino ide and an FTDI adapter. The battery can be charged with a standard lithium-polymer charger for RC helicopters.
Due to the energy efficient OLED it runs about 10 hours with a small battery.
If you’d like to build one get the schematics here: https://github.com/RickP/oleduino - The circuit board is single-sided, so it’s possible to make it yourself.
There are some hints in the readme on where to source the components.