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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.
@kri100s
Maybe not the most straight forward answer but you should be able to get it running based on those two posts.
First is Web Bluetooth app connecting to a gyro device and visualising using three.js. Its not an espruino device but you should get the idea.
http://forum.espruino.com/conversations/347308/#comment15271498
Second is Web Bluetooth app connecting to espruino Bangle watch and visualising using tinydash.
http://forum.espruino.com/conversations/346860/#comment15254612
So using bits from both examples you should be able to do what you want. I want to make a version for the second demo using three.js but its not going to be any time soon.
Hope that helps.