An Arduino Pro Mini drives an LSM303DLHC compass/accelerometer breakout board and a 12-LED NeoPixel ring. The heading is indicated with a red ‘Pixel between two yellow ones.

An Arduino Pro mini handles the selection between outputs by driving a selection of relays with appropriate timing.

Makers and ordering your enthusiasts looking for a new project to keep them busy may be interested in this new Arduino rotary phone hack which uses an Arduino Pro Mini and a SIM900 GSM shield ...

The creator of the Arduino RF Pro Mini open source development board Etienne, explains a little more about the inspiration behind the project. “ I’ve loved Arduino for years.