On 12/6/21 10:36 AM, Mike Katz via cctalk wrote:
> Each LED requires 24 bits of data. That would be 3,456 bits. The > WS2812B has a 300uS low start indication and 1.25 uS per bit. That > would mean it would take. 4.62mS to update the all of the LEDs. If I'd known about those when I designed my boards, I might well have gone that way. They're surprisingly inexpensive even. Instead, I ended up using a 16-LED driver chip that basically looks like a shift-register. I clock in the 144 bits (just on-off, no fancy tri-color LEDs I'm afraid), toggle the latch signal, and there it is. If you want to support more indicator panels, it's just a longer shift register. I then added RS422 driver chips for noise immunity and there I was. Dave
