Switching between two LEDs

Discussion in 'The Projects Forum' started by Netguru5, Oct 31, 2009.

  1. Netguru5

    Thread Starter New Member

    Oct 28, 2009
    4
    0
    Hopefully, this should be simple for you gurus! I need help designing a curcuit on a breadboard that switches between two different colored LED's operated with a momentary switch. I also need a 1 second delay between the transition. I would appreciate any help.

    Thanks :)
     
  2. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    Why don't you try something like this:

    [​IMG]
    Using the following equation, T = RC Where T = Time, R = Resistor Value, and C = Capacitor value, you can set the time.

    Austin
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Do you want to toggle between them, or light one momentarily and go back to the original. If it is the latter soemthing like this?

    555 Monostable
     
  4. Netguru5

    Thread Starter New Member

    Oct 28, 2009
    4
    0
    Sorry, I should have been more clear, I want to be able to toggle between the two LEDs when the momentary switch is engaged. Here is a flow of the desired function.

    * Power supply comes on and LED1 is Lit.
    * Momentary switched is engaged
    * LED1 goes OFF
    * 1 second delay
    * LED2 is lit
    * Momentary switched is engaged
    * LED2 goes OFF
    * 1 second delay
    * LED1 is lit

    I woud also like to retain which LED was last lit when the PS is turned off, then back on.
     
  5. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    That last one is a kicker, for a electronic circuit to remember its state it needs power. You either have to have a form of standby power or a mechanical setup, IMO.
     
  6. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    Hi Netguru5,

    I believe I buit that same circuit from the "500-In-One Project Lab," but I'm not sure. If you can't find a free manual for it online, I'd be glad to take a look for you in mine.

    Austin
     
  7. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Three resistors, two LEDs, a pushbutton switch, and an 8-pin PIC. ;) Otherwise a small bistable latching relay would be my simple memory of choice. Don't have a circuit at the moment though.

    Ken
     
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