We have a small dog who, from a young age, decided that the mat in our bathroom was the ideal place to have a sly wee.  The problem was that we could never catch her doing it.  We were resigned to having to put up with the smell of stale wee in the bathroom, and having to wash the bathmat every couple of days.

Then we got another dog.  He decided that the mat under my desk was his personal toilet.  Enough was enough!  I had to find a way to deter these dogs from weeing on the mat.

Step 1: The parts

I went to my local electronics store and bought an infrared "light beam" intrusion alarm kit for about $40.  This kit had to be assembled from components, but you could also use a regular IR intrusion detector from a home security system, or an infrared shop door alert buzzer - it's just more expensive.

You will need the type of detector that sets off an alarm when a light beam is interrupted.  A passive Infrared sensor might work, but it's probably not as reliable and it will drive you crazy when you are using the bathroom. 
Dogs typically don't like loud noises, particularly sudden ones.  I coupled the intrusion detector with a 130dB piezoelectric siren.  A 12V power supply ensured that the alarm would always be ready to deter the dogs.
Very clever! Now I need you to develop a device that handles all wee areas.You see we adopted two little dachshunds that were outside dogs ans I have not yet been successful at preventing them from weeing on the furniture or defecating wherever they wish.
130dB is a bit loud, don't you think? Something as simple as a 70-90dB <br> <br>There is a really epic website for little circuits and robots. <br>~~http://www.futurlec.com/HardwareMain.shtml~~ <br>Also, just skim through the tons of small components from sirens, buzzers, servos, meters, sensors, ect. It's very inexpensive on there. You can also buy a $5 pack of <br>100 LEDs!
Hi. <br>I just used what I could find. In this case, I found a 130dB piezo alarm unit at my local electronics shop. <br> <br>I love Futurlec! Fairly quick delivery, good prices, and their PCB prototype service is great!
I can see a myriad of uses both inside and outside of the house...<br><br>Equally useful for other creatures that come creeping in the night. 4 legged, 2 legged, and some with wings.<br><br>EXCELLENT my friend, SIMPLY EXCELLENT!
Good Idea
This is GREAT. You should try to catch this in action on video and post it. <br />

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