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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.
@MatB
Ah ok!
So if I power the ACS712 from the VBAT pin from the board (I'm running from microUSB) that will keep it powered stably.
I can then play around with the maths from there... Thanks for the help, I'll give it a go again later in the week.