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Building bed wetting alarm

Discussion in 'Hobby Electronics' started by Mike, Nov 4, 2006.

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  1. Mike

    Mike Guest

    I am hoping to build a bed wetting alarm. The tricky part is the actual
    alarm (I'm a beginner).

    I was going to buy the Liquid Level Sensor from JayCar
    (http://www.jaycar.com.au/productView.asp?ID=KG9138), but wondered about
    buying the components myself, so looked around for circuits. I found
    the following:

    http://www.zen22142.zen.co.uk/Circuits/Alarm/walarm.htm

    I'm guessing it'll do the trick. What I would like though is that once
    the alarm sounds, it continues untill it's shut off. Also, as an alarm,
    can I use any piezo in the above circuit?

    Any help would be greatly appreciated.

    M
     
  2. Borat

    Borat Guest


    Unless you want to do it purely for fun / learning, I recommend hiring a
    commercial unit if you have the need for one , they are quite effective and
    not costly.

    There may even be a chance that use of an ineffective alarm unit could make
    matters worse - the above is assuming you have a "real" application. Google
    "enuresis" alarm if you haven't already.

    If you DIY, power it from a couple of AA batteries and _not_ from a plug
    pack.

    regards
     
  3. Terryc

    Terryc Guest

    Level sensor? what is this for? A whale?

    hint, go pee on an electric fence.
     
  4. Wayne Reid

    Wayne Reid Guest

    It would certainly wake him up if he wet the bed!!! And it would detect if
    he smoked in bed as well - a very useful project.
     
  5. Rick Measham

    Rick Measham Guest

    Just get a standard 240v cable, cut whatever end is opposite the power
    point and strip the wires back a bit. Staple them to a piece of
    cardboard a little way apart. Plug it in and place the cardboard in the
    middle of the bed. When you wet the bed, you'll learn about it fairly
    quickly*

    Most people will argue that cardboard is a bad idea as it isn't very
    reusable. Once it gets wet, it loses it's stiffness. However you're
    unlikely to need to use the above system for more than one bed-wetting.

    Cheers!
    Rick Measham

    *Disclaimer for the stupid: Don't do this. It's just a joke.
     
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