Smart watches and the chatter about an upcoming example from Apple have ignited the imagination of many enthusiasts - and some enough to spur them into making their own instead. One example of this has been documented by Korean Arduino enthusiast Tortuga. His smart watch is based around a tiny Arduino-compatible board with a Bluetooth module for communication with an Android device and small OLED for display.
Apart from normal time-keeping, the watch communicates with the Android device and can receive messages, notifications and so on. Being powered by a tiny rechargeable battery allows for around seven hours of autonomy - however considering the origins of the watch this is a great effort which is demonstrated in the following video:
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