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Propeller DisplayFinal Project Presentation

Ragnar Ómarsson & Aníta Björk Hlynsdóttir

Department of Science and Engineering (TVD)Reykjavík University

29. November 2012

Introduction

This is a different way to display messages.It is called a propeller display because it has one array of ledthat spins on a propeller and uses persistence of vision (POV)to display the message.This might get more attention than a regular display.

Ragnar Ómarsson & Aníta Björk Hlynsdóttir, RU Propeller Display, Final Project Presentation 2/16

Background on POV

Persistance of vision is a sort of deception of the eyeThe concept used for movies shot on filmAlso the basis for old cartoons

Figure: Example of a film: [1]


Usage

Mostly used for fun by hobbyistsCan be used to display advertisementsSuitable for home usage

Figure: Example of a POV device: [2]


Design: Overview

Problem solvingComponent testing

MotorsSensors

PrototypingFinal Build

Figure: The fan motor Figure: The optical sensor


Bill of Materials: Prototype

The prototype was built mostly out of leftover material lyingaround the electronics lab and the machine shop.

FanArduino UnoOptical sensorVero prototyping boardLED, Resistors & WiresSheet metalPOM "Plastic"Plywood


Design: Prototype

Figure: The prototype Figure: Prototype testing


Final Build: issues

The prototype had some issues that we would have to address inour final build.Main issues to address:

Work on propellerPCB boardReduce weightBalance the propeller

Clean up designAdd real time clock (just for fun)


Final Build: circuit design

The circuit schematic was done in Eagle.

Figure: The Propeller Display Schematic


Final Build: design

The Propeller Display main design components:

Figure: Case for front viewdesign Figure: Case for top view design

Figure: PCB layout for frontview design

Figure: PCB layout for top viewdesign


Bill of Materials: Final Build

The final build was done with the following materialsFanAtmega328 microprocessorReal Time Clock (DC 1307)Optical sensorPCB boardLED, Resistors & Wires9V battery caseMDF woodmisc. screws, paint, etc.


Final Build: The result

Figure: The product 1 (top view)Figure: The product 2 (frontview)


Software

The devices can be programmed with all sorts of displays. To makethe programming easier for us and also to make the main functionsmore easily readable an Arduino Library was written.The Arduino Library Alphabet contains:

Function that specifies which LEDs to useFunction that specifies the time for each pixel as well as thetime between charactersFunctions that can write out the characters ’A-Z’, ’0-9’, ’:’, ’/’and ’-’


Future Work

This is one of those projects that never end. New ideas areconstantly surfacing. Our next steps in this project would be:

Adding XBEE or bluetooth module to enable wirelesscommunication with the displayDoing additional programming work


References

[1] Example of a film, Available online at:http://www.sdkerr.com/animation/biffLogo/muybridgeFilmStrip2.jpg[2] Figure of POV device, Available online at:http://www.jeffreythompson.org/blog/wp-content/uploads/2012/04/Unknown3dPersistenceOfVisionProjectMakerFiareShenzhen.jpg


Questions and demonstration

Thank you for your attention,Aníta & Ragnar


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