555 Timer question

Discussion in 'General Electronics Chat' started by stevezila, Apr 6, 2010.

  1. stevezila

    Thread Starter New Member

    Dec 19, 2008
    6
    0
    Hopefully someone can help with this. I'm looking to put together a circuit using a 555 timer that can dip switch adjustable for 1,5,7 minute durations so that when I get an imput from a PIR sensor, the timer will turn on a light and as long as I get reoccuring pulses from the PIR sensor meaning that there is motion in the room, the light will continue to stay on and when they leave the room the PIR will not detect any motion and the timer will time out and the light will turn off. Really Appreaciate any replies in advance.

    Thanks
     
  2. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
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  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
    4,172
    397
    To cut down on current drain , bulb was changed to 9 bright white LED's in 3 strings & PIR's V was regulated.
     
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