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Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Cursitor Doom <cd999666@notformail.com> Newsgroups: sci.electronics.design Subject: Re: Damned Projects! Date: Sun, 29 Dec 2024 13:28:22 -0000 (UTC) Organization: A noiseless patient Spider Lines: 34 Message-ID: <vkripm$103ae$2@dont-email.me> References: <gqarmjlh9gc54qu1mg410hivqqt7vtg0kn@4ax.com> <000463@dontemail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Sun, 29 Dec 2024 14:28:22 +0100 (CET) Injection-Info: dont-email.me; posting-host="173759948bcb20f9a9aa2f858b6b626b"; logging-data="1051982"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18QvHI9Ruo2kQacNUv111LsEd+jbJspLtM=" User-Agent: Pan/0.149 (Bellevue; 4c157ba) Cancel-Lock: sha1:4URXok5kB84erBtJvSqdMZJk1Gc= Bytes: 2696 On Sat, 28 Dec 2024 12:39:15, Wanderer wrote: > On 2024-12-26 14:29, Cursitor Doom wrote: >> Gentlemen, >> >> I'm currently in the process of building a device which will shut off >> the power to a washing machine in the event of a hose failing and >> spewing water out all over the floor. This is an eventuality which has >> always caused me considerable angst, so I finally decided to do >> something about it. After all, those flimsy 'exhaust' hoses go brittle >> over time and having one split 'in action' could cause a significant >> amount of damage to the surrounding area in a very short time. Having >> something to cut the power off instantly as soon as the water hits the >> floor would be a very worthwhile addition to the utility room and >> beyond. >> I came up with a pretty simple design which I've already proven to work >> first time at the breadboarding stage. However, turning this concept >> into a practical proposition is taking *far* longer than I'd imagined. >> I am getting there, but *slowly* and was wondering whether other people >> here have the same sort of problem as I invariably do with these little >> personal projects they undertake? >> >> Your hydrophobic pal, >> CD >> >> > The way I've seen water detectors done is with an LED angled to reflect > off a piece of glass to a photodiode when the glass is dry. When the > glass is wet the index of refraction of the glass/water is different > from the glass/air and allows the light to pass through and not hit the > photodiode. That's how automatic windshield wiper raindrop detectors > work. I kind of suspected that was how they worked; nice to have it confirmed.