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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.
@Gordon
That looks great! I'd say that's all you need with the ferrites - I wouldn't worry about the mains wires, it's more to try and combat interference caused by sparks in the relays themselves.
Hope it works better now!