salty joe
06/25/2014, 06:51 AM
I made a simple and inexpensive 'water in the wrong place' alarm using two piezo buzzers and a 12V wall wart.
I connected the + from the wall wart to both piezoes, then spliced a second ground wire to the wall wart. Then, I connected a wire to the negative side of each piezo. Touching the neg wire from a piezo to the neg wire from the wall wart activates that buzzer.
To hold the wires in place on the floor, I cut a piece of 3" PVC a couple inches long and drilled four holes just big enough to pass the wire through. Two holes near the top and two holes near the bottom about 1/4" apart. With the insulation stripped from the ends of the wire and the wire a blond hair from the floor, if the floor gets wet, the piezo screams. You can put the water sensors where you need them and put the piezoes anywhere you want them. Wired in parallel gives you independent alarms using a single wall wart. I like not having to deal with batteries.
eBay sells the piezoes for cheap and if you can solder, it's a piece of cake. I had fun with this, hope you like it too.
I connected the + from the wall wart to both piezoes, then spliced a second ground wire to the wall wart. Then, I connected a wire to the negative side of each piezo. Touching the neg wire from a piezo to the neg wire from the wall wart activates that buzzer.
To hold the wires in place on the floor, I cut a piece of 3" PVC a couple inches long and drilled four holes just big enough to pass the wire through. Two holes near the top and two holes near the bottom about 1/4" apart. With the insulation stripped from the ends of the wire and the wire a blond hair from the floor, if the floor gets wet, the piezo screams. You can put the water sensors where you need them and put the piezoes anywhere you want them. Wired in parallel gives you independent alarms using a single wall wart. I like not having to deal with batteries.
eBay sells the piezoes for cheap and if you can solder, it's a piece of cake. I had fun with this, hope you like it too.