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jsokolowski
Posts: 11
Pizman82,
your first explanation is what I did.
I don't know how to post attachments to the forum. If someone can tell me how I will share my circuit diagram.

John
2018-06-17 14:44
Avatar
jsokolowski
Posts: 11
pizman82,
your first description is correct. That is what I did.
I don't know how to post an attachment to this forum. If someone can tell me how I will post my circuit design.
Thanks for all the help.
John
2018-06-17 14:45
Avatar
StephanHo
From: EDDG, Germany
Posts: 1761
Supporter
Hi John,

Both pm's and atachments are not possible in this forum.

You can use pictures, for example upload at directupload.net and link the hotlink here in the text as a picture.
Grüße,
Stephan
2018-06-17 20:12
Avatar
jsokolowski
Posts: 11
I breadboarded a two display circuit, each having 6 seven segment displays. Each has their own MAX 7219. They are cascaded together. This circuit works properly. It is constructed exactly like my board except with only two MAX 7219 instead of four.

Here is a link to a picture of my board: https://1drv.ms/u/s!ArR648dibF2X0FoKYBV0SzpR5XhW.

I went back and resoldered some connections on the board but am still having the same problem.

John
2018-06-17 21:32
Avatar
jsokolowski
Posts: 11
I found my problem. It was the cable from my Arduino to the circuit board. I was using a 16 pin IDC cable interefaced to a terminal block. That interface was the problem. Once I wired the board directly to the Arduino I had no problems.

Thanks for everyone's help.
John
2018-06-17 22:06
Avatar
StephanHo
From: EDDG, Germany
Posts: 1761
Supporter
Hi John,

exactly that would have been my next question after studying your layout.

Fine if it works now.
Grüße,
Stephan
2018-06-18 00:04
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