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Building bed wetting alarm
- 11-04-2006
November 4, 2006, 12:22 pm

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

Re: Building bed wetting alarm

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

Re: Building bed wetting alarm

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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