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Topic: Help with old-school display (Read 1 time) previous topic - next topic

floresta

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You should be able to do it using only three pins, plus power/ground with the right driver chip! So no need for I/O expanders unless you really want them.


You can do just about anything using only three Arduino pins.  Just substitute 'the right microprocessor' for 'the right driver chip' in your statement above.


Don


BulletMagnet83

I think I was correct in my original wording, since I don't know what the "correct driver chip" is, without knowing if it's a CC or CA display ;) But in any case, whatever it is, is likely to only need the three pins to control it.

highroller


You should be able to do it using only three pins, plus power/ground with the right driver chip! So no need for I/O expanders unless you really want them.

www.youtube.com/watch?v=ND7777N1h8Q

An example I built using the MAX7219 driver. Only works with common cathode displays though, so if you have common anode you'd need something else... but it was pretty easy to get running and I'm hardly an expert user!


Great work.
I also want to be able to control those 5 digit leds dynamically with a data feed coming to the arduino board from a computer (for example : led no 3 = 25345 or led no 1 = 00293) so that's another weird part.

floresta

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I also want to be able to control those 5 digit leds dynamically with a data feed coming to the arduino board from a computer (for example : led no 3 = 25345 or led no 1 = 00293) so that's another weird part.


That's not really weird nor hard to implement.  In reply #6 I recommended a counter to generate a source of changing data.  When that is working you just substitute your data feed from the computer as the source.

Don

Docedison

The MAX7219 is an interesting part... GREAT for 7 seg displays AND it makes a great driver for an 8X8 matrix display. Don't forget the Holtek HT1632 driver as it it is a most versatile LED driver too.

Doc
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