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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.
@Tobbe
If you wanted to speed it up, could you constantly play a 1V tone, so you could skip the ramping up before sending the actual data?
And why a 2V swing? I thought you only needed a .4V swing. Is it just to get it as reliable as possible?