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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've just been using the cheap ones shown here: http://www.espruino.com/433Mhz
They seem to work pretty well for me. You should be able to mix and match them too - but the cheap receivers seem to let a lot more noise in, which can make it harder to decode signals reliably on Espruino.