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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.
@Fteacher
As @Mi said there are other models that work pretty well.
I waited for the new model to come (polar verity sense) to buy 2nd hand the previous model. I bought it on leboncoin.fr a French website like craig's list.
Was able to find one for 50 euros 1 year ago. There's a test video
on youtube that convinced me to get this model.