Do IR sensors work in the dark. that's pretty much it thanks for your reply
If you are talking about Passive InfraRed detectors (PIRs) like the one shown in the link below, then the source of the IR light is something like a human body or an animal, which emits IR as heat. As long as there is a body walking around, then these PIRs could detect it even in otherwise total darkness. If you are talking about other forms of IR, like those forms of IR closer to the visible spectrum, then normal PIRs will not detect that, but instead you need other kinds of IR detectors which will require IR emitters (IR LEDs) to provide some kind of IR light source.
air250
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If you are talking about Passive InfraRed detectors (PIRs) like the one shown in the link below, then the source of the IR light is something like a human body or an animal, which emits IR as heat. As long as there is a body walking around, then these PIRs could detect it even in otherwise total darkness. If you are talking about other forms of IR, like those forms of IR closer to the visible spectrum, then normal PIRs will not detect that, but instead you need other kinds of IR detectors which will require IR emitters (IR LEDs) to provide some kind of IR light source.
http://www.parallax.com/StoreSearchResults/tabid/768/txtSearch/pir/List/0/SortField/4/ProductID/83/Default.aspx