ROTATING LED MESSAGE DISPLAY

Discussion in 'General Electronics Chat' started by Abhinavrajan, Sep 7, 2016.

  1. Abhinavrajan

    Thread Starter Member

    Aug 7, 2016
    78
    1
    How does the rotating LED message display work?

    What is the logic and concept behind it.
     
  2. AlbertHall

    Distinguished Member

    Jun 4, 2014
    3,320
    738
    1. consider the message as written in a circle with the end joined to the beginning
    2. Display the message
    3. wait a short time
    4. redisplay the message moved 1 character or pixel (depending on whether it is a character or graphic display)
    repeat 3 and 4
     
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  3. Art

    Distinguished Member

    Sep 10, 2007
    797
    61
    Imagine one of the LED scroll signs in trains and terminals.
    If you cover up ever vertical line of the display except one, it’s now one of those things.
     
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  4. dl324

    Distinguished Member

    Mar 30, 2015
    4,248
    839
    There are many ways to do it. It depends on the programmer.

    I've been experimenting with a $9 computer called C.H.I.P. One of my first experiments was to display Hello World on a 5x7 LED matrix. When I finished that, I regretted not wiring a larger display so I could implement a scrolling message. In spite of only having a matrix large enough to display a single character, I decided to implement a scrolling display.

    The way I did it was to construct an array with the message and then treat the LED matrix as a "window" that I "slid" over the message array.
     
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