Driving LED matrix with shift registers such as 74HC595

Got it... used following code (r2() w/ 10ms vs. r() w/ iTm=4ms):

function r2() {
  setInterval(function() {
    var rdx = 5;
    dnoe.reset(); // enable outpu
    while (rdx) SPI1.write(dbuf[--rdx],dnss);      
    dnoe.set();   // disable output
  }, 10);
}

function r() { // run
  dnoe.reset();
  rdx = 4;
  iId = setInterval(function(){
      rdx = ++rdx % 5;
      SPI1.write(dbuf[rdx],dnss);      
  }, iTm);
}

I

It's a little bit dimmer, but it works... less duty cycle but the advantage of begin more consistent.

Two shots attached show the different intensities and clip attached shows flipping between r2() and r().

2 Attachments

• runAlternate.mp4
•