31 Oct
2015
31 Oct
'15
3:03 p.m.
On 31/10/15 21:11, Charles Anthony wrote:
What I don't know how to do is drive 500 or so
LEDs.
I am guessing a bunch of shift registers, but I've pretty much reached my
design limits. I need some guidance on locating and understanding the
technology to run that many LEDs.
I have made a 60x120mm PCB which drives 64 LEDs
using the
MAX7219 or MAX7221 driver. This has a 3-signal link (clock, data,
select/latch) and has a +5V supply.
https://www.maximintegrated.com/en/products/power/display-power-control/MAX…
Here is the bare board. I'm not in a position to supply boards, but
could provide the Eagle or Gerber files for anyone wanting to
manufacture them. I'm also happy to supply the schematics, though
there's nothing too special about them.
http://s14.postimg.org/583oflg35/LED_driver.png
The boards can be daisy-chained so you only need 3 outputs to
drive any number of LEDs (depending on the update rate.)
--
Lawrence Wilkinson lawrence at ljw.me.uk
The IBM 360/30 page http://www.ljw.me.uk/ibm360
