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Water leak alarm

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ProDrawerCom:
I know almost nothing about electronics. Tried a year or so ago at age 65 to learn it. My eyesight went bad within a few months and I could no longer read schematics or component numbers, etc. But I’d like to build something to protect my new kitchen hardwood floors. Thought I’d get some kind of a plastic pan to put under dishwasher and refrigerator and sink. The pan would be slightly tilted to let any water drippage roll down to a collector trough which would set off an alarm or just an LED. Can someone tell me where to start? Thanks

PS: I know that water leak alarms are commercially available, but none of them are designed just the way I want mine to be.

Bored@Work:
The classic one is an Aspirin tablet and a specialty prepared clothes peg holding the tablet.

The peg is filed a down a bit and is equipped with contacts, the Aspirin gets stuck in the peg between the contacts to keep them open. Aspirin, when getting wet, quickly dissolves, the contacts close, and if you connect a buzzer and a battery to it you have your alarm.

vk6zgo:

--- Quote from: Bored@Work on July 31, 2012, 05:07:29 am ---The classic one is an Aspirin tablet and a specialty prepared clothes peg holding the tablet.

The peg is filed a down a bit and is equipped with contacts, the Aspirin gets stuck in the peg between the contacts to keep them open. Aspirin, when getting wet, quickly dissolves, the contacts close, and if you connect a buzzer and a battery to it you have your alarm.

--- End quote ---

That is classic Engineering ,no PICs,no other high tech crap--it just does the job asked of it!
Bravo! ;D

digsys:

--- Quote from: vk6zgo on July 31, 2012, 06:29:48 am ---That is classic Engineering ,no PICs,no other high tech crap--it just does the job asked of it!
--- End quote ---
But .. how do you reset it? ... and how do you calculate dA/dT? (de Asprin / de Time)

Rerouter:
reseting it would be to stick in another asprin, or just something between the contacts, from its intended purpose you want the thing to keep warning you till you reset it,

also the disolving rate of an asprin isnt that critical, it is merly there to act as a presence of water sensor more than an amount of water sensor,

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