Wrist watch first of all is an accessory which is always with you. So you may want it to be unique, convenient, useful and of course hackable/programmable. While big players like Apple, Google and Samsung are working on smart watches, Hairy Kiwi has built a great open source watch prototype called OTM-02. He wanted to use energy efficient technology in it, so practically once he coupl put hands on few on them, he started working on this watch. As heart he’s chosen Energy Micro ultra low power Leopard EFM32 ARM microcontroller. Since every watt counts, he used long waited 128×128 memory LCD from Sharp Microelectronics. It consumes about 60uW on static image display.
Watch is powered from 150mAh Li-Po battery. Watch can be programmed and charged through USB port. It also features a vibrator motor, piezo electric diaphragm for sounds, five miniature tact switch buttons, LED back light. Watch circuit is placed inside 3D printed case – it really looks and feels open source. Like many open source projects it is still experimental and who knows it may include other stuff like accelerometer, wireless connectivity or GPS navigation.