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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 - use leaded solder, I didn't mention that.
Also solder does 'go off'. The stuff I have isn't quite as good as it should be I think... I guess it gets corroded and maybe the flux in it isn't that good - for nice clean (small) joints I end up adding flux.