Robo Olympics Badge

DigitalDj

Does the Robo Olympics Badge use a scanning method for Matrix's? If it does can some explian how it works?

Thanks,
Kevin


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JonnyMac

If you mean multiplexing, then yes. I've attached my code; it's commented fairly thoroughly and should make sense.

DigitalDj

Thanks,

It looks like different code then what I originally downloaded or maybe i'm just crazy!

I will study over it.


I am tring to understand how multiplexing works from the code side.··Does the display get alot less voltage and current because of the multiplexing(timing) compared to just the led being hooked straight up to a bench supply?


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Post Edited (DigitalDj) : 12/5/2007 6:10:46 PM GMT

JonnyMac

Well, that's my version -- it is a re-crafting of the originator's code.

Multiplexing is not too hard, once you get your mind wrapped around it. The display is a matrix, and only one column can be on at any given time. So the code turns on a column, outputs the row bits for that column, and leaves it on briefly before moving to the next. Since our retinas will hold an image for a few milliseconds the fast column-to-column switching looks like a contiguous display.

I've written about multiplexing in some of my Nuts & Volts columns, perhaps they'll shed more light:
-- http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol6/col/nv117.pdf
-- http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol8/col/nv141.pdf
-- http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol8/col/nv142.pdf (this one uses an 8x8 dot-matrix display)

Post Edited (JonnyMac) : 12/7/2007 2:15:04 AM GMT

DigitalDj

Thanks,

I will read over these!

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