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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.
@AntiCat
Have you considered buying Oregon Scientific or similar transmitters and just implementing the receiver on the Raspberry Pi?
Receiver Library is available on GitHub https://github.com/daveblackuk/RPI_Oregan
Just be careful not all transmitters use the same protocoll.