scrolling display assistance

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#1
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hello friends,

 

i wish to do a scrolling display with led dot matrix display...if any one here in this forum who did this project successfully(in avr or arduino) , then it will be so helpful if i get the circuit diagram and programming logic.. i hope replies from dear friends here... thank you very much for your all suggestions and help.. thank you

Last Edited: Mon. May 23, 2016 - 06:49 AM
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There must be a zillion examples on the web for such a thing. Have you not Googled and found something?

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Kartman wrote:

There must be a zillion examples on the web for such a thing. Have you not Googled and found something?

thanks for your reply sir,

sir i saw so much examples , but if i get it from here then i can be sure that it working one...after make the pcb and soldering, if it do not work then it will be so difficult to change circuit... so i asked here for a project done by anyone here,then it will be more reliable

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I don't know what gave you that misguided impression!

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Kartman wrote:

I don't know what gave you that misguided impression!

 ok sir thank you very much for your reply

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My mental model is there are 2 ways to do a rectangular led array....  static or refreshed. Static is straightforward... an 8 by 64 display will need 64 octal latches. Same display refreshed will need one column or 8 (a 74595?) and you refresh 64 col * 70 times a sec -> 4480 times a sec -> every 223usecs. Not a prob for a 16 or 20MHz AVR. I bet if you published the schematic, and said something like 'I've tried and tried to get this booger to scroll, but it just flashes' that within a day or two you'd have 2 or 3 programs to try.

 

 

Imagecraft compiler user

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Good Grief,

 

I used a few of these displays from adafruit:

 

https://learn.adafruit.com/adafr...

 

There is an example library you can download under SOFTWARE on that page the link points to.

 

It's for a single display with the Holtek driver chip.

 

Jim

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