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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.
@allObjects
Something in your circuit works as a Wifi or other RF antenna... (assuming you use Wifi. It could alos be that your CPU clock is 'heard' quite 'loudly'...
Open - or not strong enough pulled-up or pulled-down inputs, lousy connections, and lousy ground/GND connections can cause this issue...