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VOL. 7, ISSUE 1 (2023)
Design and implementation of a photovoltaic powered moving message display system
Authors
Dabs D Y
Abstract
The focus of the
research was the design of a stand- alone PV powered moving message display system
for implementation at the main gate of ATA Polytechnic. The display system
circuitry was designed and drawn using the proteus software. The total load
profile of the display system and other electrical loads at the main gate where
the system would be installed were computed and the value obtained was used to
select and size the major components of the PV system needed to power the LED
dot matrix display system. The 24 pieces of 4” 5 x 7 Acrylic LED dot matrix
modules used as the display panel were horizontally arranged and cascaded
together to produce a panel of 120 columns and 7 rows to display the text in
one line. An aluminium casing was fabricated with internal dimensions to house
the LED array. The display system was then interfaced to the Atmega8515
microcontroller, while one piece of UNL2003 Darlington sink driver, a 74HC295
buffer and 15 pieces of 74HC595 shift registers were connected to form the
intermediate section. A program code in Assembly Language was written and burn
in to the microcontroller to output control signals for the drivers to sink
current to the dots and scan the rows and columns of the LEDs in quick
succession using multiplexing technique. On completion of the construction and
testing, the display system was test run and observed to display the text “Welcome to Atapoly Bauchi” which scrolls from left to right. The
components of the photovoltaic power system required to supply power to the
moving message display were sized. The framework to support the components
parts were fabricated and fixed. The two PV modules were rigidly fixed on the
supporting structure inclined at an optimum tilt angle of 300, and
connected to the other component parts of the system at the gate. Tests were
conducted and the system was found to be working as designed.
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Pages:18-22
How to cite this article:
Dabs D Y "Design and implementation of a photovoltaic powered moving message display system". International Journal of Advanced Engineering and Technology, Vol 7, Issue 1, 2023, Pages 18-22
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