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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
I'm afraid it would involve some pretty major software changes to Espruino to get it to work. On the hardware side, the 5th pin on Micro USB isn't brought out anywhere, and to do it properly you need some power switching arrangement as well to supply power to the client device.
Basically doing it that way would be really difficult.
However, this has been asked a few times before, and there's a chip that will handle USB Host for you called the MAX3420/MAX3421: http://forum.espruino.com/conversations/284427/
It's available on a board with everything you need from a few places. A quick search on eBay for
arduino usb hostshows you can get them for under $5 (although I'm not 100% certain those use the MAX3421) - so not much more expensive than a USB OTG cable.There's no code for it for Espruino as far as I know, but the example code looks like it would be trivial to port over and I'd be happy to help if you have any questions about it.