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CIRCUIT HELP NEEDED

Discussion in 'Electronic Design' started by RON, Sep 1, 2003.

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  1. RON

    RON Guest

    I WOULD LIKE TO BUILD A CIRCUIT ALLOWING ME TO LIGHT 1-21 LIGHTS ONE AT A
    TIME BUY PUSHING A MOMENTARY PUSH BUTTON.PUSH ONCE ONE LITE TWICE 2 STAY LIT
    UP TO 21.I COULD BUILD FROM A SCHEMATIC.EMAIL THANKS RON
     
  2. For this, I'd suggest using a shift register (probably need three 8-bit
    registers
    (SN 74LS164 or similar) for upto 24 lights). Use a de-bounced momentary
    push button as the clocking source. Each push would represent one clock
    cycle. Shift in all 1's and use the parallel outputs to control mosfets
    which
    are controlling the lamps. With this scheme, you could also have an
    additional
    reset pushbutton to turn off all the lights at once or feedback the 22nd
    parallel
    output to use as the reset.
    Operation would be each push of the button would light a lamp in series -
    while
    previous lit lamps remain on. After 21 pushbutton pulses - all lamps are
    lit.
    The 22nd pushbutton will reset (turn off) all the lamps.
     
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