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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
Yes, you're right - there's only Bluetooth on the device itself. USB is just for power.
I believe some Adafruit bluefruit LE USB boards can be configured to bridge Bluetooth LE serial to USB serial, but it's a bit of a faff.
You can wire up a $5 USB-Serial converter really easily though - just 3 wires. You found it, but just for anyone else looking, here's the link: http://www.espruino.com/Pixl.js#serial-console