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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