1. ECE 477 Group 11 RevGeo Multipurpose Puzzle Box
Josh Marchi, Jeff King, Paul Rosenberger, Dan Chambers

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 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.

5. Hardware: Battery Management
MAX1555
Dual USB/AC Adapter Battery Charger
Output pin to show power is present

6. Hardware: Battery Management
TI TPS54331
3.3V Regulator
Microcontroller
GPS
microSD
Compass
TI TPS61175
5V Regulator
LCD
RFID
Servo

7. Hardware: Microcontroller
PIC24FJ256GA106
Operating Voltage: 3.3V
16 Bit Architecture
16 MIPS CPU speed
256KB Flash
16KB RAM
4 UART Modules
3 I2C Modules
3 SPI Modules
64 Total Pins

8. Hardware: GPS Trimble Copernicus II (w/ SparkFun BoB)
UART (3.3V, matches micro)
Operating Voltage: 2.7V – 3.3V
Various pull-up and pull-down resistors

9. Hardware: Digital Compass
LSM303DLH (w/ SparkFun BoB)
I2C Serial Out (3.3V, matches micro)
3.3Vcc Input
Built-in Voltage Regulators:
1.8V (Digital Supply)
2.5V - 3.3V (Analog Supply)

10. Hardware: RFID ID-12 Operating Voltage: 5V TTL Serial Out (5V)
Micro has 5.5V tolerant digital inputs

11. Draft Schematic…
GPS
Micro
Speaker
RFID
Compass

12. Questions?