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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.
@LawrenceGrif
@DrAzzy thank but it's more like 1-wire as the tx/rx line are shared. Also like RS232 bit's have to be be inverted e.g a 1 is approx 0V on tx/rx line. After a lot of goolging I've found a UART to SDi-12 but it ain't cheap.