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Sound detected countdown timer?

Discussion in 'General Electronics Discussion' started by melk76, Jan 27, 2011.

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  1. melk76

    melk76

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    Jan 27, 2011
    Hi guys, I'm trying to create a project that when activated by a sound, starts a countdown and then sounds an alarm (about 5 mins - pulsating one using a 555 timer) and can repeat.

    Or, if the time delay can decrease (between each alarm) after each run. Ie -

    Sound detected, Countdown starts, Alarm sounds, (back to countdown start, if possible 'take 1 min' )

    Thanks so much for any help!! I'm so confused lol, I've realy got no idea about values etc. So I'd be SO grateful for any help!! All the best,:D:)


    (I've added a block chart for it if it helps :) )
     

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    Last edited: Jan 27, 2011
  2. davenn

    davenn Moderator

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    Sep 5, 2009
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