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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 5    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 5,May 2012
The Power Saving Low Cost Rotating 8 Led Information Display
Full Text(PDF, )  PP.777-781  
Author(s)
Sheikh Rafik Manihar
KEYWORDS
— Microcontroller, Persistence of Vision, Space Multiplexing, Rotating display, Position encoder, Prime mover, pristine balance.
ABSTRACT
This paper explains the project which is a special kind of circular LED display. With the help some mechanical assembly, LED count, hardware requirement, and hence overall cost is cut to very affordable price. Also, maintenance and repairing of the display is so easy, that anyone having a little electronics knowledge can take care of this. All the synchronizing can be implemented through software. First of its kind, made using the 20-pin 8051 series microcontroller, this project use the principle of Space Multiplexing. This propeller display is mechanically scanned and displays the characters in digital format. Made from scrap it can be used anywhere and everywhere and the most amazing fact about this display is its crystal clear display. This display consists of just 7 bright LEDs which are rotated to show the display. For building this project, requirement is just a small 20 pin microcontroller, a position encoder, and LEDs. This display can show the messages, which will require a whopping 525 LEDs. So hardware and cost minimization is achieved.
References
*1+ Mitchell’s modular LED x-y (horizontally and vertically digitally scanned array system) was cited in the 29th International Science and Engineering Exposition "book of abstracts", page 97, published by the "Science Service", Washington D.C. May 1978.

[2] Technical reference detailing the LED display array, RF interface and scanning circuit was included as part of the 1978 29th ISEF exhibition in Anaheim, CA.

[3] Coltheart M. "The persistence of vision." Philos Trans R Soc Lond B Biol Sci. 1980 Jul 8; 290(1038):57–69.

*4+ ‚The 8051 microcontroller and Embedded Systems‛ by M.A.Mazidi.

[5] Propeller Display Rennes’s H8 Design Contest 2003 Entry H3210

[6] An Analog & Digital propeller clock I made! By Luberth Dijkman.

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