• Wow, nice! That's one hell of a write-up!

    You might find that the display is more averse to flicker if you do something like:

    function r() { // run
      setInterval(function() {
        var rdx = 5;
        while (rdx) SPI1.write(dbuf[--rdx],dnss);      
        // whatever SPI write needed to turn all columns off
      }, 10);

    By scanning all in one go and then turning off, you don't get a slightly brighter row appearing if some other JS code takes a while to execute.


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