I just assembled lady ada's ethernet shield.. it works fine! Now I would love to use it with MAX7221 to control a LED matrix...
Which pins are used to control the wiznet? Which ones may I use to control the rest of my project?
Pins 11, 12 and 13 are the standard SPI pins. Pin 10 is often used as a "chip enable" for an SPI device--although I don't know if this is the case with the shield.