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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.
@allObjects
On the mac book pro (I have a mid 2009 one), the keyboard goes out when too much current is pulled from the USB (a short happened by mistake that caused the USB to dtrigger the fuse). Restart of the laptop get it going again. This could be a cause.
Can you give a bit more detail how you connect all your things?