This Compass Module made exclusively by Parallax is a dual-axis magnetic field sensor built around the Hitachi HM55B IC. Parallax has made this compass IC accessible by providing Hitachi’s surface mount sensor chip with a 3 V onboard voltage regulator and resistor protection, all in a 0.3" wide 6-pin DIP module. The Hitachi HM55B Compass Module is compatible with all Parallax microcontrollers (including the BASIC Stamp microcontroller’s 5 V supply and signal levels). Acquiring measurements from the module is made easy with a synchronous serial interface, and even easier with the BASIC® Stamp 2 commands SHIFTIN and SHIFTOUT.