Wrist mounted touch screen with Teensy 3.2 and various other things (clock, heart rate monitor, compass, dalek detector...)
It was originally inspired by the Vortex Manipulator worn by Captain Jack Harkness on Dr Who, but it sort of drifted away from that because I wanted it to do something useful and manipulating a time vortex was beyond me.
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I've posted all the build info here
There are pointers to the source code, eagle files etc from there.
And there's a video demo of it https://youtu.be/WImzifKEVy0.