Propeller Display of Message by Virtual Leds
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Transcript of Propeller Display of Message by Virtual Leds
Propeller Display Of Message By
Virtual Leds
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Propeller Display Of Message By Virtual Leds
Introduction
Propeller is a term associated with a circular rotating object. As this needs to
rotate whole circuit assembly, there must be some prime mover attached to it. So,
the term ‘Propeller’ is used.
It uses bright light emitting diodes for displaying the characters and symbols on
its assembly. propeller led display is the right name given to this project.
It is the phenomenon which is related to vision capability of the human eye by
which an afterimage is thought to persist for approximately 1/25th of a second.
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Propeller Display Of Message By Virtual Leds
So, if someone is observing the images at a rate of 25 images per second,
then they appear to be continuous.
Propeller runs on a single battery with wall adapter facility.
The best example of this property is the red circle we observe when we
rotate the firecracker or incense stick in a circle.
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Propeller Display Of Message By Virtual Leds
Block Diagram
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Propeller Display Of Message By Virtual Leds
Working
Propeller Display of Message comprises of the circular display of a string
of LEDs.
LED string mounted on a printed circuit board are duly interfaced to a
microcontroller by using a high-speed motor and some mechanical
assembly.
An appropriate program while executed drives a pair of a single line LEDs
in space multiplexing mode.
It displays some message and or a clock timing taking advantage of
persistence of vision of the human eye.
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Without the single line of LEDs in space multiplexing mode if one would have
to display a message, number of LEDs as high as 525 would have been used.
The synchronizing is be implemented through software.
Propeller Display Of Message By Virtual Leds
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Propeller Display Of Message By Virtual Leds
Hardware Requirements
Microcontroller, Sensors.
Resistors, Capacitors, Diodes.
Transformer, Voltage Regulator.
Transistors, Leds.
High Speed Motor.
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Propeller Display Of Message By Virtual Leds
Software Requirements
Keil compiler
Language: Embedded C or Assembly.
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Power Supply
Propeller Display Of Message By Virtual Leds
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Propeller Display Of Message By Virtual Leds
The 230V AC supply is first stepped down to 12V AC using a step-down
transformer.
It is then converted to DC using the bridge rectifier.
The AC ripples are filtered out by using a capacitor and given to the input
pin of the voltage regulator 7805.
At output pin of this regulator, we get a constant 5V DC which is used for
MC and other ICs in this project.
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Propeller Display Of Message By Virtual Leds
Features Of Microcontroller
8K Bytes Of In-system Programmable (ISP) Flash Memory
4.0V To 5.5V Operating Range
Fully Static Operation: 0 Hz To 33 MHz
256 X 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Full Duplex UART Serial Channel
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Bob Blick's Propeller Clock Project
Bob Blick made the clock spinning on a piece of perf board.
The power is provided from the spinning armature of a plain DC motor.
But this Project has not got viability though Bob was Successful in
Displaying the Numeric Digit on a propeller Display.
Propeller Display Of Message By Virtual Leds
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Propeller Display Of Message By Virtual Leds
Applications
Applications can find their way to cost effective solutions for large public
displays, information systems.
It can directly replace Railway station information displays, bus stands
and many more places.
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Future scope
Can be integrated with GSM such that ANY Message from the End-user
with a phone can display the text by merely sending SMS.
It can be made possible to display the clock RTC on the display.
Propeller Display Of Message By Virtual Leds
http://www.edgefxkits.com/
Propeller Display Of Message By Virtual Leds