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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 awesome! Thanks for posting all the steps - sorry for the lack of replies but I was out most of last week.
... and I definitely need to get one of those Rigol scopes. That looks a mile better than what I'm using at the moment!
You might find that a 0.3v schottky diode makes it a little more reliable (it'll pull the voltage back up a bit higher than a normal (0.7v) diode would). I was going to say the capacitor value might be a bit high, but actually on the video the waveform you get looks really nice :)