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

2 Electrical and Computer Engineering Concept

3 Electrical and Computer Engineering Concept

4 Electrical and Computer Engineering Concept

5 Electrical and Computer Engineering Our Project  Orientation Sensing 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 Electrical and Computer Engineering 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 Electrical and Computer Engineering Specifications  150 Meters from Knowles

8 Electrical and Computer Engineering 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 Electrical and Computer Engineering Hardware: System Block Diagram

10 Electrical and Computer Engineering 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 Electrical and Computer Engineering Digital Compass  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 Electrical and Computer Engineering Gyroscope  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 Electrical and Computer Engineering Accelerometer  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 Electrical and Computer Engineering 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 Electrical and Computer Engineering 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 Electrical and Computer Engineering Central Processor Unit (CPU) Process the signals from the MCU and drive the HUD

17 Electrical and Computer Engineering Heads Up Display (HUD) Contacted three companies

18 Electrical and Computer Engineering 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 3.3VNational Semiconductor, LP38691DT-3.3 5VNational Semiconductor, LP38691SD-5.0 Battery Pack Ultralife 9V lithium ion rechargable battery, 1700mAh

19 Electrical and Computer Engineering Associated Costs ComponentCost Digital Compass $50 Gyroscope$40 CPU$180 3 Axis Accelerometer $15 GPS ($75) PCB Fabrication$100 Batteries$50 Total$435

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

21 Electrical and Computer Engineering Thank You Questions?