Some would say that an electronic dice would take the fun away from the game, but I’m not sure that’s always true. Anyway as the friends from PyroElectro say “we’ll make it anyway”. It’s based on the ATmega8 which controlls 7 LE’s that show you the number. All the schematics and source code is available for download.
The muscle powered Dice is based on Faraday’s law, consisting of a tube with cylindrical magnets. The tube is wound with a coil of magnet wire. As the tube is shaken, the magnets traverse the length of the tube back and forth, thus changing the magnetic flux through the coil and the coil therefore produces an AC voltage which is used to drive the electronic dice. Pretty simple now that you know how it’s done 🙂
Electronic Batteryless Dice: [Link]