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GeoPuzzle Box: Innovative GPS Locked Game

The Reverse Geocache Box directs users to locations using GPS, LCD, and RFID, challenging them to unlock it. Computation, communication, and battery power are key design considerations. Featuring microSD card storage and multiple sensors for an engaging experience.

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GeoPuzzle Box: Innovative GPS Locked Game

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  1. RevGeoMultipurpose Puzzle Box Dan Chambers, Josh Marchi, Jeff King, Paul Rosenberger

  2. 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 or text displayed on LCD, or by an LED compass • 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 accelerometerand 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. Major Design Constraints • Computation • GPS Coordinate analysis, tilt compensation calculations • Communication • Interact with GPS, RFID, Compass, LCD in a timely fashion • Battery Powered Device • Low power usage / rechargeable battery • Packaging • Compact, “personal-sized” box

  5. Computational Requirements • Compass heading / tilt compensation (polled) • Floating point values, trig functions required (lookup table) • GPS coordinate analysis (1Hz) • Distance from target • SD card file system, interface library • Large amount of Flash/SRAM

  6. Interface Requirements • Receive data from a variety of sensors/modules • GPS, RFID, Accelerometer/Magnetometer • Read data from MicroSD card • Output audio to speaker • Control servo locking mechanism • LCD Display • Parallel GPIO / shift register (6 - 12 GPIO pins) • LED compass ring • Shift registers (2 GPIO pins) • 1-2 Pushbuttons (GPIO)

  7. On-Chip Peripheral Requirements • 3 UART Modules • GPS, RFID, Debug • 1 SPI Module • MicroSD interface • 1 I2C Module • Accelerometer / Magnetometer • 2 PWM Channels • Speaker, Servo Control • 2+ Output Compare Timer Channels • Compass polling, LCD strobe

  8. Component SelectionMicrocontroller • PIC24FJ256GA106 • 16 Bit Architecture • 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

  9. Off-Chip Peripheral Requirements • GPS Module • RFID Receiver • Digital Compass • Accelerometer/Magnetometer • Serial to USB Bridge • Debug

  10. Component SelectionGPS Receiver • Trimble Copernicus II • Time to first lock: 38 sec • Dual serial ports • Reconfigurable UART rates • Position Accuracy: <2.5 m 50%, <5 m 90%

  11. Component SelectionDigital Compass • LSM303DLH • +- 2/4/8 g Accelerometer • +-1.3 to +- 8.1 gauss Magnetometer • I2C Serial Out • Excellent application notes for tilt compensation

  12. Power Constraints • Battery powered device • Lithium-Ion Polymer single cell battery (3.7 VDC) • 3300 mAh • Multiple operating voltages • Micro, GPS, MicroSD, Compass (3.3V) • LCD, RFID (5V) • Two converters be used to regulate both voltage levels. • Must be rechargable • MAX1555 USB battery charger IC will be used • Allows charging through USB or additional DC source

  13. Packaging Constraints • Highly durable • Easy to carry • Relatively small in size • Should be able to receive GPS signal from within the box through an antenna • Pelican 1150 Case • Inside dimensions 8-3/8" x 5-7/8" x 3-11/16"  • Outsidedimensions 9-1/4" x 7-9/16" x 4-3/8"   • LidDepth 3/4"

  14. Cost Constraints • Most expensive: GPS receiver - $80 • RFID kit - $50 • Digital Compass - $30 • GPS, RFID, and Compass initially include breakout boards, which increase their cost • Box should not exceed $300 • Box made without breakout boards would cost less than $225

  15. Questions?

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