6 Dec
2021
6 Dec
'21
12:07 p.m.
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