Water AlarmCircuit

Posted on Feb 7, 2014

Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall Or maybe you`ve come home to find your aquarium fish trying to swim across the carpet For your sake, we hope not, because the consequences are usually fairly dramatic. With a handful of electronic components, you can at least ensure that you will be war

Water AlarmCircuit
Click here to download the full size of the above Circuit.

ned before you have to put on your waders. It`s better to prevent water problems than to have to correct them. But no how many precautions you take, an occasional leak can still happen. A burst water supply hose for the washing machine, a bath tap that someone forgot to turn off, a broken aquarium wall, or a leaking boiler or central heating tank anything is possible. In such cases, it`s nice to be warned as quickly as possible, for example by an acoustic water alarm. Then you can at least limit the damage. If you`re handy with a soldering iron and know the difference between an IC and a PC, you`ll no doubt enjoy building the electronic water alarm described here. The circuit takes advantage of the fact that normal` water is always slightly contaminated, even if only slightly, and thus conducts electricity to a certain extent. It is built around an popular IC from the somewhat antiquated 4000-series logic family: the 4093. This IC contains four inverted-output AND gates (NAND gates) with Schmitt-trigger inputs. If water is detected between the probes, it emits an intermittent and rather irritating beeping tone. The conductivity of the water is used to active the circuit built around IC1a. The two electrodes (probes) are fitted at the lowest point where water will come to stand. They can be two tinned copper wires, but you can also use two pieces of circuit board with the copper surface coated with solder. The combination of...

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