Propeller Display Of Message By Virtual Leds

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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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Propeller Display Of Message By Virtual Leds

• 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.

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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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Propeller Display Of Message By Virtual Leds
Power Supply
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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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Propeller Display Of Message By Virtual Leds

• 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.

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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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Propeller Display Of Message By Virtual Leds

• 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.

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Propeller Display Of Message By Virtual Leds
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