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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.
@JumJum
I've a NodeMCU and its running with its own power supply.
First when I got it, I tried with USB, and ran into tons of problems.
Sometimes it worked, sometimes there was no way to get it running.
I would recommend a seperate power supply. May be adding a big capacitor could help (?)