DMD2 4x4 display

The Dot Matrix Display (DMD) is a 32x16 array of high-brightness LEDs for visually striking effects. [Product Page]
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Ahmed1
Posts: 5
Joined: Sun Jun 03, 2018 10:58 pm

DMD2 4x4 display

Post by Ahmed1 » Sun Jun 03, 2018 11:40 pm

Good day gents
I'm recently used DMD2 library
I connecting 16 DMD,P10 with Arduino Uno
4 width, 4 height
It's working but the speed of Arduino is slow
The speed of changing is taking delay
1.Any help to faster the rate of changing ,make Arduino faster
2.when make serial communication with another Arduino the Rx TX take long delay time
Any help with this issue also

Thanks
Ahmed

Brissieboy
Posts: 134
Joined: Fri Sep 20, 2013 7:25 am

Re: DMD2 4x4 display

Post by Brissieboy » Mon Jun 04, 2018 12:19 am

Ahmed1,
The short answer is that you have too many DMDs for a single Arduino to handle.
There is no way to improve the performace with that many DMDs.
You will have to re-think how you drive such a large array by either using a much faster processor, or changing the architecture of your design such as maybe using a master to communicate with several slaves, each driving only a limited number of DMDs.

Ahmed1
Posts: 5
Joined: Sun Jun 03, 2018 10:58 pm

Re: DMD2 4x4 display

Post by Ahmed1 » Mon Jun 04, 2018 12:26 am

What kind of processor can work with this panels
What is the maximum number of panels can Arduino work how it calculate

Thanks
Ahmed

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stryker
Posts: 268
Joined: Sat Jan 14, 2012 2:44 pm

Re: DMD2 4x4 display

Post by stryker » Mon Jun 04, 2018 8:48 am

Hi Ahmed

Because I've found it unstable with ATmega328 based Arduino above 6, I've kept my designs to 6 or fewer. Others on this forum have stated they've had success with more.

Cheers, Geoff

plito
Posts: 19
Joined: Sat Sep 23, 2017 8:24 pm

Re: DMD2 4x4 display

Post by plito » Tue Jun 05, 2018 9:43 pm

Hi Ahmed. I had the same problem. I had to used DMD library to solve the problem of the slow scrolling. Try this. Good luck

Brissieboy
Posts: 134
Joined: Fri Sep 20, 2013 7:25 am

Re: DMD2 4x4 display

Post by Brissieboy » Wed Jun 06, 2018 3:32 am

Using the DMD library you will definitely not be able to run with your 4 x 4 DMD array. You need to limit the number on a Uno or equivalent to 6, or even fewer if you want your processor to do any other work. There simply insn't enough time to update 16 DMDs at a rate acceptable to view.
You might want to look at this thread - as well as others on this forum.

plito
Posts: 19
Joined: Sat Sep 23, 2017 8:24 pm

Re: DMD2 4x4 display

Post by plito » Wed Jun 06, 2018 2:34 pm

May be using an Arduino Due that is much faster than Uno.

Brissieboy
Posts: 134
Joined: Fri Sep 20, 2013 7:25 am

Re: DMD2 4x4 display

Post by Brissieboy » Thu Jun 07, 2018 7:29 am

Hi plito,
He does state in his initial post that he is using a Uno.

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