If you’ve ever wanted to know how many GPS satellites are receivable at your location here’s a good beginneer’s Propller project that provides the answer. Its a GPS status display project Nick Ernst developed written in SPIN code and using a Propeller Mini Board, VPN11513 GPS Receiver, shift register and 7-Segment LED display. “The Propeller Mini Board talks to the VPN1513 GPS Receiver and converts the received data to usable values that you can use in an application of your choosing. In this case, we are looking at the “Signal Validity” and the “Number of Satellites” strings from our GPS unit and converting that data into a visual representation through two LED’s and a 7-Segment Display.”
Full details, schematic and SPIN source code can be found at Learn.Parallax.