ArDeci -> MAX7219 (x3) -> RGB 8x8 LED Matrix prob.

Forum 2005-2010 (read only) Hardware Interfacing
41

I have tried with different 7219IC, same result found that means my IC should be working fine.

Still all the LED light up in two cases:

  1. I just have 3 digital pins and GND connect with Arduino board
    or 2) GND and 3V / 5V are connected with Arduino with the IC

anyone experience this? http://www.flickr.com/photos/siusoon/3245731401/