I'm planning to build a LED array to display graphics, patterns and things like that. One Idea is to build a robot with a LED "face".
I have some experience with the picaxe chips so I was planning on using one of those for this build. I've got my eye on the Picaxe-28X2 module.
I've been reading about the 28X2 chip having bidirectional I/O pins but I can't tell from the Picaxe manual spec how many inputs or outputs it has, or how many of these are bidirectional.