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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
Sure - I think the RSSI grapher in EspruinoHub does it: https://github.com/espruino/EspruinoHub/blob/master/www/rssi.html#L106
You just need to call
setDataon the graph itself