Virtual Imaging Peripheral for Enhanced Reality Aaron Garrett, Ryan Hannah, Justin Huffaker, Brendon McCool

Project Overview Our 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 Criteria 1. 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 Variables VariableSize (bytes) frameReady_flag1 buffer_pic (RGB array) copy_pic (RGB array) x_pixel4 (int) y_pixel4 (int) x_angle4 (float) y_angle4 (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