This was very early in the morning and there could have, logistically, been no reason for any passing object/person to trigger it; my only thought is that for some reason an increase in room temperature could have caused this - but this seems unlikely to me - any thoughts ?
2007-01-10 00:29:33 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Physics
The technique is based on photoelectric effect. There is small stream of electrons which when cut start ringing alarm. hence a small insect might have done this.
2007-01-10 00:37:28 · answer #1 · answered by Mihir Durve 3 · 0⤊ 0⤋
Most sensors are very sensitive - read the manufacturers guidelines - it could be that you have set it to a highly sensitive setting - some manufacturers ask that you set the sensitivity to a less sensitive setting by a factor of 1.
No idea what could of set off your alarm.
Since you mention heat and early morning it could be that the movement of air or building as the temperature rises and falls could have set it off. An open door / draft or clock chimes perhaps ?
2007-01-10 10:46:41 · answer #2 · answered by sneek_matrix 2 · 0⤊ 0⤋
our car alarm kept going off last night but it was so windy did you have a window open and maybe the curtain blew in front of the sensor or maybe the wind just set it off but its going to be very windy again tonight
2007-01-10 08:41:46 · answer #3 · answered by lorraine x 3 · 0⤊ 0⤋
It sould have been anything lke a fly, bug, or the grim reaper
2007-01-10 10:57:35 · answer #4 · answered by manc1999 3 · 1⤊ 0⤋
some of those things are really sensitive, so maybe it was just a little bug or something that flew by it.
2007-01-10 08:33:35 · answer #5 · answered by perkyash2005 3 · 0⤊ 0⤋
Dust from your fan-forced heater. Try cleaning the cobwebs from your ceiling.
2007-01-10 09:01:21 · answer #6 · answered by simon l 3 · 0⤊ 1⤋
a ghost! woooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo. Arrrrrrrrrrrrrrrrrrrrrrrrrrrrrr.
2007-01-10 08:37:22 · answer #7 · answered by RobStar 2 · 1⤊ 0⤋
mice
2007-01-10 10:58:57 · answer #8 · answered by ufo18 4 · 0⤊ 1⤋
SSSSOUNDS REAL SPOOKY TO ME ...............
2007-01-10 08:37:55 · answer #9 · answered by KATT 2 · 1⤊ 0⤋