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How hard would this be to make?

Discussion in 'Electronic Basics' started by John Comma Smith, Jan 26, 2005.

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  1. I got a bit of a weird request for circuit people out there. I want to make
    a display out of LEDs. I'm not sure of the size of the display as of yet,
    but I want to be able to program the LEDs to blink in a random fashion,
    scroll text across them, or a combination of that. How hard of a circuit
    would this be to build, and what would be the best chip to program from my
    computer? Thanks in advance.
  2. peterken

    peterken Guest

    - put the leds in a matrix
    - use a microcontroller for the sequence
    (needs "calculation" in case of text)
    - control them at rather high frequency, so ni flickering occurs

    or just buy an existing module... :-D
  3. I was thinking of buying an existing one but do they make them in a 5 x 19
    LED size? How would I go about making a matrix for the LEDs and what type of
    microcontroller would you suggest? Thanks.
  4. peterken

    peterken Guest

    don't know what sizes of display exist, I think many varieties do
    try googling for it

    using an electric matrix of 8x8 lines gives 64 possible led's
    this only uses 2 processor ports directly
    using addressable latches only uses one processor port and one address
    using 2 8-bit latches gives you again a matrix of 64 leds
    the controller to be used can be any kind but must have enough ports
    - at least 1 if using addressable latches
    -(number of leds)/64 * 2 ports if controlling directly (=this number is
    identical to the number of latches if used)
    and enough calculation power to do the job
    the needed power of the controller is related to the number of leds to be
    connected since they must be calculated to be on or off and to create a
    smooth image if moving

    principle of the leds: (2x2 lines depicted)

    B1 B2
    | |
    | |
    A1 ---+--------+-----
    \ | \ |
    \| \|
    + +
    A2 ---+--------+-----
    \ | \ |
    \| \|
    + +
    | |

    all leds are connected as the diagonal lines are drawn
    all leds arranged in same polarity (direction)
    so 2x2 lines gives you 4 led's to control (and one half port or latch to be
  5. This doesn't seem all that hard to do. Do you know of a website that shows
    this in more detail?
  6. peterken

    peterken Guest

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