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LEDs in a Circular Clock — Parallax Forums

LEDs in a Circular Clock

K5RPHK5RPH Posts: 1
edited 2009-09-15 13:30 in General Discussion
Can anyone give me some advice on how I could use 60 LEDs in a circle turning each one on/off with 1 second intervals which would simulate the sweeping second hand of an analog clock? Thanks

Larry
K5RPH

Comments

  • W9GFOW9GFO Posts: 4,010
    edited 2009-09-12 02:16
    My thirst thought is to use a SIPO shift register. I just ordered some 74HC164Ns to try something similar.

    Rich H

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  • SRLMSRLM Posts: 5,045
    edited 2009-09-12 02:29
    Multiplexing would work too. There is also a 64 LED driver chip out there (MAXIM... something or another).
  • Roger LeeRoger Lee Posts: 339
    edited 2009-09-12 02:41
    Maxim Max7219 serial led driver would work nicely.

    I found them easy to use with BS2 , have not tried with propeller yet

    Roger
  • mctriviamctrivia Posts: 3,772
    edited 2009-09-12 05:38
    555 timer 6 bit counter and decoder ic.

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  • kwinnkwinn Posts: 8,697
    edited 2009-09-12 19:44
    If you want to do it in hardware the simplest circuit would consist of two 74HC4017's in series. The first one would drive 1 of 10 columns, and the second would select one of 6 rows. If a 1 pps pulse is available the only additional hardware needed would be the driver IC, and that is only needed if you need a high current to drive the leds.
  • Agent420Agent420 Posts: 439
    edited 2009-09-15 13:30
    I would suggest 'Charlieplexing'·- no additional hardware required. ·A Google will return many projects like these.

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