Satellite antenna positioning system

Τίτλος

Satellite antenna positioning system

Θέμα

Computer software developers

Programming languages (Electronic computers)

Δημιουργός

Theocharis, N. Petrides

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

2002

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

EED0421

Σύνοψη

Satellite Antenna Positioning System combines software design and a small P.C.B
construction, so the project is divided into two main parts.
As software concerned it is written in Delphi language. Delphi combines Pascal with
windows. The program executes the following procedures. First it will check if the
angle is valid. If not valid it will display invalid number error. On the other hand if
angle is valid then it will follow th~ next procedure that verifies if the angle is in range.
If the angle is out of range it will display out of range error. If angle is in range it will
follow again the next procedure which is the determination of the rotation that motor
will execute, clockwise or anti-clockwise. For example if the needed angle is greater
than the current angle, motor will rotate clockwise. If now the needed angle is less
than the current one, motor will rotate anti-clockwise. So the program will start
rotating the motor in proportion to the given angle until it reach the needed one. Then
it will save the present position of the antenna (save angle).
On the other hand as P.C.S construction concerned or else the interface card, will
be taking the data through the printer port and close relays in proportion with the
rotation of the motor (right or left). Also at the same time our antenna will rotate at the
same direction. The data address of the printer board is 378h-37 Ah.
To eliminate the noise that card may gain we put capacitors that would be used as
filters. Also to stabilize the voltage we put a voltage regulator (8250). We will give to it
a voltage approximately 9v in the input with an adapter, and it will give us in the
output a constant voltage 5v. So in this way we will be able to supply the card with
the needed voltage.
Moreover the card employ the following IC's which their use will be explain later.
The IC's are 74HCT574, ULN2803A, 74HCT244 and 74HCT139.