Persistence of Vision Machine

Persistence of vision (POV) refers to the optical illusion whereby multiple discrete images blend into a single image in the human mind and believed to be the explanation for motion perception in cinema and animated films. Like other illusions of visual perception, it is produced by certain characteristics of the visual system (link). Our objective is to build a large display by taking advantage of POV using precision activated LEDs and rotational mechanics.

Problem Definition
The University marching band is aiming to improve their halftime shows using LED based devices, and requires a large, low cost display that is both entertaining in form and execution of display content.

Project Requirements

 * The diameter of the visual display should be at least two meters.
 * Capable of maintaining rotational speeds necessary for POV.
 * The machine should be weather resistant.
 * It should not require more than two people to transport safely.
 * The electronics should not require any external power sources.
 * LED colors should be capable of University theming.
 * Display content should be programmable by anyone given instructions.
 * The display's on-time should be at least 10 minutes in duration.
 * A single POV machine should cost around $250.
 * Write instructional documentation to assemble a POV machine.
 * Build six POV machines to display the letters "UIDAHO".

Background
Currently, the University of Idaho marching band has been using LED electronics to improve their half time shows. As their LED devices become more extravagant, so does their design. Our task is to build a visual display using ordinary LEDs that boasts an entertaining design. POV is particularly elegant in this respect, as it can provide an avenue of visual entertainment without using a typical store bought display. The project will implement the concept of POV by spinning a strip of LEDs in a circular motion at high speeds. The rotational movement combined with precision blinking of LEDs creates a visible image, similar to a regular TV screen. This design however is much cheaper, more robust, and a unique display of entertainment. Our objective will be to create six 6' diameter POV machines. These machines will be used by the University of Idaho Marching Band for the purposes of halftime football game performances to display entertainment content.

Project Learning
As our project has progressed in development, we solve one problem after another. The following is a categorial breakdown of the project learning for each major component.

Mechanics

 * Spokes
 * Mobility
 * Rotational Mechanics

Electronics

 * LEDs and Imaging
 * RPM, Calculations, and Code
 * Supplying Power