Development of an alphanumeric display

Τίτλος

Development of an alphanumeric display

Θέμα

Computer software--Development

Information display systems--Design and construction

Light emitting diodes

Δημιουργός

Georgiou, George

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1996

Συνεισφέρων

Hadjioannou, Soteris

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

EED0578

Σύνοψη

The purpose of the work is to create an alphanumeric display, and the appropriate driver so that a number of alphanumeric displays (16-segment LED displays) can be driven so that data can be outputted. This data can be results of an operation, status reports or simple data.
The display will make use of the persistence of vision. This is the inability of the human eye to see things which change in a frequency more than 30 Hz.
When the displays will individually switch ON but at a high frequency they will seem stationary and therefore the eye will believe that all are lit up at the same time.
In order to make the construction easy and simple and the programming of the device as simple as possible, a handful of discrete components is going to be used. The simplicity of operation of the driver allows the connection of such a display driver to any microprocessor that has an output port available.
In order to avoid the troublesome programming of microprocessors using EPROM's and EPROM programmers, a Personal Computer is going be used.
Many dedicated I/O .cards are available for outputting data but since the printer port of the PCs has similar characteristics to the output ports of microprocessors and is something that all computers have and therefore the cheapest solution, it was preferred.
The control of the display is made possible using the parallel printer port of a PC and the programming is part was made using one of the High Level languages available; Quick Basic.
The display will be connected to a driver which will be connected to a port extender. The port extender is used to increase the output lines of the parallel printer port.
The port extender is connected to the driver which is in turn connected to the alphanumeric display. The driver receives the information and drives the display. On the next page a simple diagram shows the parts which make up the project.