Piggy Backing LED to trigger a relay

Discussion in 'The Projects Forum' started by Pietenpol, Apr 4, 2011.

  1. Pietenpol

    Thread Starter Member

    Dec 27, 2008
    I have a 5v relay that receives a signal from the scoring system to reset the machine in my Bowling center when it is the 10th frame and you don't get a second ball. I also have an infra-red beam that the ball breaks to trigger the scoring. When it isn't the extra ball scenario the machine cycles via a mechanical switch triggered by the ball striking a board in back of the machine. I would like to eliminate the mechanical switch (breakage and light balls from kids not setting it off specifically). My thought was to piggy back from the IR emitter/detector somehow and wire it into the 10th frame relay. There is an alignment monitor led if the beam is broken. Is there a way to monitor that and have it trigger the 5v relay? I would also have to build in a time delay of about 3 seconds before it does it.
  2. Wendy


    Mar 24, 2008
    As always, schematics are always the place to start. You show us yours, then we show you ours.