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RevGeo Multipurpose Puzzle B ox. Dan Chambers, Josh Marchi, Jeff King, Paul Rosenberger. 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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revgeo multipurpose puzzle b ox

RevGeoMultipurpose Puzzle Box

Dan Chambers, Josh Marchi, Jeff King, Paul Rosenberger

overview
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
psscs
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.
major design constraints
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
computational requirements
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
interface requirements
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)
on chip peripheral requirements
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
component selection microcontroller
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
off chip peripheral requirements
Off-Chip Peripheral Requirements
  • GPS Module
  • RFID Receiver
  • Digital Compass
    • Accelerometer/Magnetometer
  • Serial to USB Bridge
    • Debug
component selection gps receiver
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%

component selection digital compass
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
power constraints
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
packaging constraints
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"
cost constraints
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
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