Mike Rankin created this board with a tiny OLED display controlled by an ESP8266:
I created this design as a challenge to make a design under 1″ x 1″ in size.
The hardware is an ESP-01 ESP8266 Wifi module, linear power supply, microUSB connector and a few oled display parts.
The design files and source code are available on GitHub:
Here is a video of the assembly and operation:
miker has shared the board on OSH Park: