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Josh Marchi, Jeff King, Paul Rosenberger, Dan Chambers

– Software Design Considerations –. Josh Marchi, Jeff King, Paul Rosenberger, Dan Chambers . Project Overview. “Reverse Geocache” Box Locked box that will only open after one or more pre-determined GPS locations have been visited

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Josh Marchi, Jeff King, Paul Rosenberger, Dan Chambers

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  1. – Software Design Considerations – Josh Marchi, Jeff King, Paul Rosenberger, Dan Chambers

  2. Project Overview • “Reverse Geocache” Box • Locked box that will only open after one or more pre-determined GPS locations have been visited • Directs user to next location by GPS coordinates, compass heading, or text description displayed on LCD. • Route stored on microSD card located inside the box, able to be reprogrammed by PC • RFID “master key” to allow access to box without finishing puzzle

  3. PSSCs • An ability to obtain and decode global positioning data in order to verify if current location matches pre-determined desired location. • An ability to utilize accelerometer and magnetometer data to determine a compass heading with tilt compensation. • An ability to access and interpret files located on a microSD card. • An ability to display information to the user via an LCD display. • An ability to identify an RFID tag using an RFID reader.

  4. Software Design- Computational Requirements • GPS coordinate analysis at a rate of 1Hz • Determine distance to next waypoint • Compass heading / tilt compensation at a rate of approximately 5Hz • Floating point values, trig functions required (lookup table) • SD card interface uses MDD File System Library • Large amount of Flash/SRAM

  5. Software Design- Microcontroller • PIC24FJ256GA106 • 16 Bit Architecture • Up to 16 MIPS CPU speed • 256KB Flash • 16KB RAM • Memory Disk Drive File System Library Support • 4 UART Modules • 3 I2C Modules • 3 SPI Modules • 64 Total Pins • Reasons for Selecting: • Enough UART/SPI/I2C channels • Adequate Flash/RAM for all code/libraries • MDD File System Library Support

  6. Software Design- Code Organization (Interrupt/Polling Hybrid) • Interrupts Generated • UART Rx character received (GPS, RFID) • Flag set when entire message received • Periodic Timers (compass, fuel gauge polling) • Flag set, polling done in main loop • Main Loop • Analyze RFID message if flag is set • If ID matches “master key”, unlock box, play buzzer, update LCD • Analyze GPS message if flag is set • If GPS matches desired waypoint, load next waypoint, update LCD • If GPS doesn’t match waypoint, just update LCD with new position • Obtain Compass data if flag is set • Calculate heading with tilt compensation, update LCD • Obtain Fuel Gauge data if flag is set • Calculate and update LCD

  7. Software Design- Initialization Flowchart

  8. Software Design- Main Loop Flowchart

  9. Software Design- Code Hierarchy (TOP)

  10. Software Design- Code Hierarchy (TOP)

  11. Software Design- Code Hierarchy (PC Debug Interface)

  12. Software Design- Code Hierarchy (TOP)

  13. Software Design- Code Hierarchy (RFID Module Interface)

  14. Software Design- Code Hierarchy (TOP)

  15. Software Design- Code Hierarchy (GPS Interface)

  16. Software Design- Code Hierarchy (TOP)

  17. Software Design- Code Hierarchy (Compass Interface)

  18. Software Design- Code Hierarchy (TOP)

  19. Software Design- Code Hierarchy (Fuel Gauge Interface)

  20. Software Design- Code Hierarchy (TOP)

  21. Software Design- Code Hierarchy (MicroSD Interface)

  22. Software Design- Code Hierarchy (TOP)

  23. Software Design- Code Hierarchy (LCD Interface)

  24. Software Design- Code Hierarchy (TOP)

  25. Software Design- Code Hierarchy (Miscellaneous Interfaces)

  26. Questions/Discussion

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