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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@OwenBrotherwood
yes: power is gonna be an issue.
Current day apple watches do not show the time all the time and apple only have one button on their iPads/iPhones, so the interface to the watch, with one button and display that is only on when necessary will be ... interesting
Edit
The human interface is central RGB and ring RGB. A button and the mag.