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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
Hi Brian - if you're connecting to a COM port then that'll be your problem. Puck.js isn't a COM port device, and should appear as a special bluetooth device in the connection menu.
Are you sure you're using the IDE download that's suggested here: http://www.espruino.com/Puck.js+Quick+Start
If you're using the Web App from Chrome (or even running it by accident if you had used it with an Espruino device before) then it won't show any Bluetooth LE devices.