We always look at the round LCDs and wonder what to do with them other than, of course, a clock. Well, [shabaz] had a great idea: use it as a star map display. The project combines the Arduino, a r… ...

The next logical step was to hook up an Arduino to control the plotter. However, once the device could plot analog values, [Marv] quickly looked for a new challenge.

Thankfully, Arduino forum member Romano d'Ezzelino has put together a series of reference cards that show the basics of a number of common connections.