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This LED sequence

Discussion in 'LEDs and Optoelectronics' started by XalaX, Jul 29, 2010.

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  1. XalaX

    XalaX

    3
    0
    Jul 29, 2010
    Hi,
    i'm a newbie of this forum. I don't understand so much about electronics but i'm good in building my own circuits from projects.

    I would like to have help in making this kind of led sequence.
    If you can post me some scheme or project or link, please.

    The circuit has to turn on and off about 20 leds in this way:

    00000000000000000000
    00000000000000000001
    00000000000000000011
    00000000000000000111
    00000000000000001111
    and so on...
    11111111111111111111
    01111111111111111111
    00111111111111111111
    and so on...
    00000000000000001111
    00000000000000000111
    00000000000000000011
    00000000000000000001

    Thank you for helping me.

    Kind regards

    PS forgive my bad english, i'm from sicily :p
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,482
    2,830
    Jan 21, 2010
    have a look at the LM3914. One of the circuits in the datasheet does just this (if I recall correctly)
     
  3. XalaX

    XalaX

    3
    0
    Jul 29, 2010
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,482
    2,830
    Jan 21, 2010
    See pages 9 and 15
     
  5. XalaX

    XalaX

    3
    0
    Jul 29, 2010
    thank you!!!
    steve you saved me!!!!
     
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