hey. i bought a usb keypad( and i was reading about serial inputs readings i was trying to connect the keypad to the arduino to read like a i put and at the same time to know how looks the number when i press them but i was trying for like one day and i have nothing, so if somebody knows something about it please help me...
This article -> http://www.circuitsathome.com/mcu/programming/how-to-drive-usb-keyboard-from-arduino shows how to drive USB keyboard.
i saw one that they dint use any shield!!! because in that one i have to buy a usb shield