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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.
@Robin
I have no experience with the ESP-1, but as it isn't mentioned, are current limiting resistors used on the signal lines?
ref: 'maximum current from the espruino pins'
http://forum.espruino.com/conversations/280779/#comment12746768