8x8 Scrolling LED display (Simple example)

[gabi68]

Still, Ioannis can you have a look on that code and give me your expert opinion

Rgds
Gabi

[Ioannis]

The code is simple and should run with no problems.

If you insist on simulation, I do not know much. I hear that Proteus is the Best, but still have a few flaws.

Did you try the code on real circuit?

Ioannis

[gabi68]

Hi Ioannis,

No, I do not have all the parts to try it. That was the reason for using Proteus. I saw a post from you regarding ULN 2083. If I decided to use that instead ULN 2004 what else should I need to modify (software and hardware)?

Regards
Gabi

[wellyboot]

regarding ULN 2083. If I decided to use that instead ULN 2004 what else should I need to modify (software and hardware)?

Regards
Gabi

ULN2803 is an 8 channel transistor array (18pin package), and the ULN2004 is a 7 channel transistor array (16pin package)

The software remains the same, with the hardware you can lower the component count, by replacing 2 ULN2004 with 1 ULN2803

[gabi68]

Hi,

After 1 month I finally make that running - simulating properly in Proteus. My problem was that ULN2803. I didn't know that chip invert signal's. After I put some hex inverters 7404 everything running properly.
My question is:
in real life (I will build the real circuit) I need that inverters or everything will run normal without that?

Many thanks
Gabi

[Ioannis]

Instead of inverters, why don't you invert he data that you output from the PIC?

Ioannis

[Ioannis]

Instead of inverters, why don't you invert the data that you output from the PIC?

Ioannis

[gabi68]

Hi Ioannis,

I try to do that but, I failed. Can you show my how? On the other hand the question it is still: do I need that inverters in a real circuit?

Thank you for your time
Gabi