A PIC18F2520-based digital compass using magneto-resistive sensors to measure the magnetic field in 3-axies:
This application note will focus on a simple, low-cost, hand-held digital compass design using a Microchip PIC18F2520 microcontroller. This compass application can be integrated into your own design, or as a building block in an advanced navigation tracking device similar to one you would find in a sporting goods store or automobile.