Virtual Imaging Peripheral for Enhanced Reality

Aaron Garrett, Ryan Hannah, Justin Huffaker, Brendon McCool

Project OverviewOur project, code named Virtual Imaging Peripheral for Enhanced Reality or VIPER, is an augmented/virtual reality system. It will track a handheld unit’s location and perspective and use this information to find the location of a camera position in a virtual environment. Through a LCD screen on the handheld unit the user will see the virtual environment at the cameras location as if the handheld unit was a window into the virtual world. As the user moves the handheld unit around a table top sized environment the handheld unit’s actual and virtual perspective changes, allowing for different viewing angles of the virtual space.

Project-Specific Success Criteria1. An ability to communicate time stamp data using

RF between the base unit and handheld unit.2. An ability to display images to the LCD display.3. An ability to estimate the angle and position of

the handheld unit with respect to an origin point using accelerometer, gyroscope, compass, visual data, and ultrasonic data.

4. An ability to find angle displacement of the handheld unit’s front face relative to the IR beacon origin using mounted camera.

5. An ability to find distance from base to handheld unit using ultrasonic emitter and receiver.

Block Diagram

Beacon Unit – Software Design Considerations Requires use of

PWM for LED Ultrasonic

UART Xbee

Timer Control Interrupt

Global Variables timeToStartPWM_flag timeToStopPWM_flag pwmActive_flag

Beacon Unit Software FlowChart

Beacon Unit Software Hierarchal

VPChip – Software Design Considerations Requires use of

I2C (TWI) Camera Commands

SPI Transmit IR

displacement angle ISI (Image Sensor

Interface) AIC (Advance

Interrupt Controller)

Global VariablesVariable Size (bytes)frameReady_flag

1

buffer_pic 614400 (RGB array)

copy_pic 614400 (RGB array)

x_pixel 4 (int)y_pixel 4 (int)x_angle 4 (float)y_angle 4 (float)

VPChip Software FlowChart

VPChip Software Hierarchal

USB HUB – Software Design Considerations Requires use of

SPI IR displacement angle

input UART

Xbee AtD

Ultrasonic Receiver input I2C

Sensor Control and Data bus

USB External Interrupts Timer

Elapsed Timer

Flags accelerometerDataReady gyroscopeDataReady magnetometerDataReady atdReady serviceFlagsQueue serviceFlagsCount

Variables newDataFlagArray dataArray elapsedTimerCounter recievingUltrasonic currentSPIInputByte tempDataArray Rs-232 circle buffer Head/Tail buffer pointers

USB HUB Software FlowChart

USB HUB Software Hierarchal

Beagle – Software Design Considerations Requires use of

USB Graphics/OpenGL

Running Ångström Linux distribution

Global Variables State Vector External angle

quaternion

Beagle Software FlowChart

Beagle Software Hierarchal