Hello there just anothe newbie here,I would like to know aproximately just how many 8x8 led matrix modules can one adruino can handle. I have seen 4-5 on the youtube demos. Has anyone made one up to 10 of these modules hooked up to one adruino?
The limiting factor seems to be not so much how many matrices can you control but how fast can the arduino update them. As others have said you can use shift registers to control nearly unlimited outputs. If you want to display an arbitrary image you need to row scan your matrices and if you don't update the rows fast enough you get horrible flickering effects.