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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
If it's not working when you connect with your Macbook, you could look in the 'Chrome dev console' and see if any errors are reported. Typing
Puck.debug=3in the dev console before you connect will show you all communications between the Puck and the Mac