Pre-Approval Form

PROJECT: PERSISTENCE OF VISION GLOBE PAGE 1

Complete the following questions (limit one page) School of Engineering Phone 503 943 7314 5000 N. Willamette Blvd. Fax 503 943 7316 University of Portland Portland, OR 97203-5798

Title of Product: Persistence of Vision Globe

Team Members: Rose Harber, Maldeep Kang, Chris Scott, Michael Burton

Brief Description of Product:

The project involves the design of a persistence of vision (POV) display that will form a sphere. This POV will be able to form many interesting three-dimensional images by rotating two arched arrays of LEDs around a vertical axle. The speed and position of the LED rings will be sensed and the appropriate LEDs will be turned on and off along the rotation path to form a desired image. The base of the POV display is where the control circuitry will be housed in a plexi-glass box to allow visual inspection and easy access for troubleshooting.

Technologies:

The technologies that the project will utilize include a microcontroller (Atmel ATmega328- 20PU), shift registers (M74HC595B) for using serial data from the microcontroller to turn on/off LEDs, batteries for power, a Hall effect sensor for detecting speed, LEDs, and a motor for rotating the assembly. The shift registers can be replaced by the creation of a MOSIS chip, which will reduce the footprint of the overall device [possibly weight depending on IC packaging].

It may be difficult to code for the calibration at variable rotating speeds for proper resolution. A single Hall effect sensor will provide feedback for the speed of rotation, which can then be used to calculate the approximate position at any time.

Another difficulty will be ensuring that the microcontroller and other ICs are able to compute quickly enough for the rotating LED ring to display a clear image.

Other Information:

The project’s beginning goals will be simple at first allowing for an understanding of the technology and the achievement of basic benchmarks (ie. Getting all the LEDs to light up, making a striped image, making simple images) and grow to include more complex images as time allows. Due to inclusion of the MOSIS chip and VLSI technologies, we would like to request Dr. Osterberg as a faculty advisor for this senior design project.

UNIVERSITY OF PORTLAND SCHOOL OF ENGINEERING