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How does sensors work in water taps and doors

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prerit | 18:21 Wed 31st Mar 2010 | Science
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Avatar Image factor-fiction
Please clarify what you mean.
(Was there no question box, as you left it blank. I'm trying to work out whether it's a problem with AB )
19:28 Wed 31st Mar 2010
Avatar Image heathfield
Infra-red sensor picks up the heat from your hands for the tap, or from your body for the door. Problem with doors...a dog passing by can cause it to operate, or, in very cold weather, your cold thick outer clothing may mean the door sensor doesn't know you're there!!
21:49 Wed 31st Mar 2010
Avatar Image Laasya
based on the temperature.
05:51 Thu 01st Apr 2010

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