I am in the process of building an 8x48 led matrix to display messages on. (im planning on asking one of my friends to prom by leaving it in her locker). i'm trying to get the display working with only one 8x8 led matrix (they are 24 pin bi color matrixes), I have tried the LEDemomatrix example for the LEDcontrol library and the display does not change. I've checked my wiring and I can't find any problems there. My guess would be that the arduino is not communicating with my MAX7219 but I don't know how to solve the problem. I'm using a breadboard to test the circut on (if that matters) and I did remeber the two capacitors between +5v and GND, also Im using a 27k resistor for iset (my matrixes are rated for 2.2-2.5v at 20 miliamps) has anyone had a similar problem? Thanks.
here's the page for LEDcontrol http://www.arduino.cc/playground/Main/LedControl
here's the page for the MAX72XX http://arduino.cc/playground/Main/MAX72XXHardware
ive attached a word document with a table of what i have attached to each of the MAX7219's pins, i did not mention the capacitors in the document