So you would like to build your own cute robotic pet with Arduino? drum303 has shared a guide to show you how to do just that. Twitch is a robotic pet that expresses itself through its eyes, movement, and sounds. It was built using an Arduino UNO, 1.2″ LED Matrix, 1x capacitive touch sensor, 1x speaker, 1x power supply and a Mini Pan Tilt kit with 2 servos.
You will need pretty simple tools to build this robot. It is a fun educational project for newbies.