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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.
@Wilberforce
Try a 2.2k or 3.3k resistor. Or 2 or 3 1k in series if that is all you have.
What length cable are you running?
On a raspberry pi I recall that 4.7k didnt work (also 3.3v) so I think it was 3.3 I used in the end.