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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
That's great!
Personally, to get a 5v signal for the output I'd just use a transistor: Rather than trying to produce a 5v signal, it's easier to use the transistor to 'pull' a signal down to 0v, and just to connect the other side of the speaker to 5v (or an even higher voltage).
There will be a bunch of stuff on it online - it looks like there's a good tutorial (for Arduino) here: http://www.instructables.com/id/Use-Arduino-with-TIP120-transistor-to-control-moto/
You can also use the ULN2003 and solder it on the board (it's just a chip with several different channels and the resistors built-in), or even the L293D which allows you to pull both high and low.