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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.
Espruino_user_dk
Just to add that the modules Manxome has suggested contain a radio and an encoder/decoder. You'd use them slightly differently, but once you have them working they'll probably be more reliable - however you won't be able to decode transmissions from things like electricity monitors, as they use their own protocol.