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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.
@cwilt
The ones I am using are not the cheap ebay versions, but these from Sparkfun. They have on board regulators and filter caps. The biggest issue I had with them in the past was distance. I have never seen this kind of noise come from them.
Curious why the IRQ pin was not used?