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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
Well, it turns out that LEDs themselves can be used to detect light: http://makezine.com/projects/make-36-boards/how-to-use-leds-to-detect-light/
The wavelengths are narrow but it might be enough. I'll see if I can make one of the pins that's connected to an LED also be one with an ADC - not sure how easy that will be though.