To interface with 5V logic, pins 2,6 and 7 need to have a resistive voltage divider to reduce 5V to 3.3V. You can use an 820 ohm series resistor and 1.2K resistor to ground to do this. 820 ohm ...

Arduino-PS2-Mouse-Handler PS2 Mouse Handler Library for Arduinos This library allows you to easily interface any PS2 compatible mouse to your Arduino using only 2 digital I/O pins. Most USB mice will ...