Re: help needed to run a 5x7 led display from a mcu

hybrid_snyper wrote:


How about a part number? This sounds suspiciously like the
dinosaur-old HDSP displays from the 70s. They suck an enormous amount
of current and require constant baby-sitting from the MCU.

http://www.dfpresource.org/hdsp2000_133.jpg

Do they look like that?

The product im trying to make is scrolling marquee as part of my
college course this is the LED display im wanting to use
https://www.lc-led.com/View/itemNumber/183. obviously more than one
will be connected, but one step at a time.

Im just struggling to get my head around the strobing, my confusion
comes from. Lets say i want the top right led lit up. I put a 1 at the
last column and the rows will strobe through, whats stopping this
strobing effect lighting up the rest of the LEDs below that top right
one.

You have to strobe both row and column ! A particular LED will only
illuminate when both strobes coincide for that LED. Think of it like a
crosspoint matrix ! Current will only flow through the two lines of a
particular point !

--
Baron:
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