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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.
@JumJum
The actual version of WebIDE on github has a new plugin, which draws line charts based on feedback from Espruino board.
In the background it uses setInterval to console.log an object with actual data, which is captured by WebIDE and sent/displayed to charting tool.
You have to activate "testing" in options. There are two tours under help button to give a first introduction. Any feedback, since this is a complex function, would be fine.