Does anyone know how to make a key logger with the micro controller?

I think you need to define key logger.

Ralph

If you are talking a device that you put between a keyboard and computer, it can be done. Search google, you'll find more info. PS2 type would be much easier than usb. To get any kind of storage capacity, you'll need either an external eeprom or other storage device. If you want it to be stealth, you'll have to be creative. I haven't seen any projects like this here. You might get some starter ideas from the ps2 tutorial.

Rick