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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.
@Robin
Wed 2018.09.26
Have you checked out the 'getPattern()' function and 'patterns' array
http://www.espruino.com/Individually+Addressable+LEDs
I think this is close to what you are after. Pretty impressive and doesn't seem to slow down using a Pico
What frequency are you after and how many X-axis points to plot?