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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.
@Sn3akyP3t3
Or you use small magnets and a hall sensor to read then you don't need to have any actual penetration of the watch core hull. I really wonder if the folks over at http://www.polymagnet.com/ would be interested in partnering up for something custom in this area. Those guys over there at poly magnet are amazing! They can custom design magnets to achieve feats that normal magnets that we know today are not capable of! Check out this video to be amazed and get an idea of what I'm talking about: https://www.youtube.com/watch?v=IANBoybVApQ