The Raspberry Pi is a credit-card size computer developed in 2012 at the University of Cambridge's Computer Laboratory, The Pi costs only $35, runs Linux in a graphical environment, and provide GPIO (general purpose I/O) connectors for sensors and motors. In this tutorial we will introduce the Pi and provide a guide to using it, include hardware and software requirements. We will also describe how we are using the Pi in undergraduate computer offering ranging from introductory program courses to upper-level systems offerings.