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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.
@user112057
That's correct, it's a battery pack, for 3 AAA bateries.
The idea is to eventually power the curcuit from MK connector where I measured I have +9V.
On the video I'm only making a test taking advantage of the fact that in Unifon I have access to same cables so I don't need to take the stairs ;)