1. Personal Heads-Up Display
Preliminary Design Review
Ivan Bercovich
Radu-Andrei Ivan
Jeff Little
Felipe Vilas-Boas
Faculty: Dr. Tilman Wolf

2. Concept

3. Concept

4. Concept

5. Our Project Orientation Sensing Unit Data Processing Unit
Gather information from orientation sensors
Data Processing Unit
Process data from the sensors, send information to display
Heads-Up Display
Virtually label surrounding area

6. Specifications Label all buildings within a 150 meter radius
Be able to run for 2 hours on the power supply
Be accurate in labeling to +/- 3˚

7. Specifications
150 Meters from Knowles

8. Design Challenges Sensing (accelerometer, gyroscope, etc.)
System has to respond to user movements in real-time
Noise (i.e.: Compass)
System has to handle electromagnetic disturbances
Size (Embedded Linux)
Portable system that will fit on the users head

9. Hardware: System Block Diagram

10. https://buy.garmin.com/shop/shop.do?pID=223#
GPS
Determine lat/long position on the campus
Garmin 18 LVC
Features
• Bare wire as connector
• Easily integrate with MCU
• 5V
• Data Output: NMEA 0183 format
• Already purchased

11. Digital Compass Detect what direction the user is looking in
Detect what direction the user is looking in
Honeywell, 2 axis digital compass
Features:
• Simple I2C interface
• 2.7 to 5.2V supply range
• 8 bit-resolution
• True drop-in solution
• Eagle library available
• 0.5 degree heading resolution

12. Gyroscope Compass compensation Gyroscope – Analog Devices ADXRS401
Compass compensation
Gyroscope – Analog Devices ADXRS401
Features:
• Complete rate gyro on an IC
• Self-test on digital command
• Z-axis (yaw-rate) response
• Precision voltage reference output
• 5 V single-supply operation

13. Accelerometer Detect head movements by the user
Detect head movements by the user
ST Micro – LIS302DL, 3 axis Accelerometer
Features:
• 0.3mA
• Sensitivity 16.2 mg/digit
• I2C Interface
• 8-bit resolution
• +/-2g or +/-8g range

14. Microcontroller Unit (MCU)
40 Pin ATMega32
µC used for Computer System Lab
Features:
• 32K of program space
• Runs up to 16MHz
• 32 I/O lines, 8 of which are 10bit A/D converter capable
• Programmed in circuit and be debugged with AVR-JTAG

15. Software Create a 3D environment with Open GL
Tag points within the environment corresponding to building layout on the UMass Campus
User movements translates to movements in virtual environment
Transpose tags from 3D environment onto HUD

16. Central Processor Unit (CPU)
Process the signals from the MCU and drive the HUD

17. Heads Up Display (HUD) Contacted three companies

18. Power Supply Orientation Sensing Unit (OSU) is battery powered
Elements in OSU run between 2V-5V
< 100mA peak power across 3.3V and 5V supplies
Data Processing Unit (DPU) is battery powered
~500mA peak
Voltage regulation
3.3V National Semiconductor , LP38691DT-3.3
5V National Semiconductor , LP38691SD-5.0
Battery Pack
Ultralife 9V lithium ion rechargable battery, 1700mAh

19. Associated Costs Component Cost Digital Compass $50 Gyroscope $40 CPU
$180
3 Axis Accelerometer
$15
GPS
($75)
PCB Fabrication
$100
Batteries
Total
$435

20. Proposed MDR Deliverables
Demonstration of Orientation Sensing Unit
Microcontroller
Accelerometers
Gyroscope
Digital Compass
GPS
Design simple 3D environment with OpenGL
PC based

21. Thank You
Questions?