a mystery - why chirping in cyclic pattern?


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Old 09-13-15, 05:08 PM
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a mystery - why chirping in cyclic pattern?

Last night it began. There is chirping -- sort of like a “smoke alarm with low battery” sound -- in our attic (but I think there is no smoke alarm there) that has a repeating 3-part cycle: chirp (wait 40.4 seconds), chirp (wait 40.4 s), chirp (wait 43.25 s). Then it repeats (40.4, 40.4, 43.25 - two short and one long) with a 3-chirp cycle every 124 seconds. It did this pattern last night beginning around 3 am, and is still doing it, 14 hours later. Do you know anything that could cause this distinctive pattern? (btw, should my question be here or in another forum?)
 
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Old 09-13-15, 05:21 PM
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What is stored in the attic? Are there any watches, electronic games, clock radios or anything else electronic?
 
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Old 09-13-15, 05:38 PM
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Very little that I know about: just a big ceiling fan drawing air from the whole house up through the attic, and a socket for an incandescent light bulb. (But maybe there is something I don't know? since I'm not certain about the attic's history) The attic floor is covered with insulation, and I’ve used a flashlight to search its surface, plus the rafters, for “anything that might make a noise” but haven’t seen anything. (fan & light still work normally)
 
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Old 09-13-15, 05:59 PM
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Do you have an air handler up there. No boxes of stuff no longer wanted stored up there? No Christmas decorations stored up there? No winter clothes stored up there?
 
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Old 09-13-15, 06:57 PM
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Mystery solved. It was tough to pinpoint the sound location because the chirp was very short, and infrequent - once every 41 seconds. But with better "echolocation experiments" I could have located the source sooner. It was a Carbon Monoxide Detector (I didn't know it existed) with a low battery, not in the attic. Oops, I apologize for bothering you with this thread. Sorry.
 
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Old 09-13-15, 07:02 PM
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Oops, I apologize for bothering you with this thread. Sorry.
Not a problem. It's fun to play detective sometimes.
 
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Old 09-13-15, 08:12 PM
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Not a problem.
Your gracious response is appreciated, Pulpo. Thanks.
It's fun to play detective sometimes.
Yes! But it's more fun to do it well, like a skilled detective with better "experiments" to discover what's happening.
 
 

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