Hi,

I know that threadd it is a little bit old but I just found it. I have one question:
- how many 74HC595 can be used with a pic?

I want control a 20x20 led matrix. If that it is not the right solution can you point me to a valid one?

Regads
Gabi

I would use two 74HC595 chips, as you only need 3 I/O pins on your pic, to control over 32 pins.
Look here for more details: http://www.kronosrobotics.com/an137/DAN137.shtml
And to use it for the Pic, you can program it in Pic Basic.. Look here: http://www.picbasic.org/forum/showthread.php?t=3214

 

Please don't hijack old threads. It's easy to start your own, and it's way less confusing.

This is the old thread - http://forum.allaboutcircuits.com/showthread.php?t=7487

Have you got a data sheet on the 'HC595 to see how to use it?