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Anybody knows what this component is? (The white cylinder.)

It has to be some kind of switch since it is marked as "S2", but I never saw anything like it before.

enter image description here

Thanks!

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  • \$\begingroup\$ It could be a level-sensitive mercury switch. \$\endgroup\$ May 18, 2019 at 16:21
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    \$\begingroup\$ Please, provide a better, focused photo. Maybe add another from a different angle of view. As per our guidelines the post should be useful also for other people browsing the site. As it stands, someone that doesn't know that component has few chances to understand what it is. \$\endgroup\$ May 18, 2019 at 16:23
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    \$\begingroup\$ I'm voting to close this question as off-topic because the provided image is of very low quality and makes the thread useful only to the OP. Anyone browsing the thread should be able to clearly discern the component that the OP wants to be identified. \$\endgroup\$ May 18, 2019 at 16:27
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    \$\begingroup\$ @LorenzoDonati, I can upload as many images as you want, but I think that all will look pretty similar, it is just a small white cylinder. If someone knows this component he/she will recognize it at once and those that don't know it will learn it and recognize it if they find it in the future. Sorry for the low quality, but it is a small component and my phone doesn't focus very well, I can't do it better. \$\endgroup\$
    – jap jap
    May 18, 2019 at 16:36
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    \$\begingroup\$ jap-jap, Posting fuzzy images has no excuse. Learn how to focus your camera-phone. \$\endgroup\$ May 18, 2019 at 17:55

1 Answer 1

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That is a kind of motion detector.

It looks very much like the SQ-SEN-200 from SignalQuest. Datasheet

Picture from the datasheet:

enter image description here

They are meant to be used in devices that should sleep when not in use, but wake up and do something when moved.

Like a GPS tracker. You want to record where your cat goes, but don't need 18 hours a day of unchanging GPS coordinates from all the naps it takes. When the cat naps, no signals from the sensor. When your cat gets up, the sensor "rattles" its output and your GPS receiver wakes up and takes notes.

That sensor is entirely passive, so it doesn't use battery power like many other kinds of motion detectors. Well, unless you count 50nA as wasting power.

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  • \$\begingroup\$ Yes, it is exactly that one. Thanks! \$\endgroup\$
    – jap jap
    May 18, 2019 at 16:41
  • \$\begingroup\$ What device did you find it in? \$\endgroup\$
    – JRE
    May 18, 2019 at 16:42
  • \$\begingroup\$ it is inside of an alarm system so it makes sense. I guess this component will be used to detect when the control board is being manipulated \$\endgroup\$
    – jap jap
    May 18, 2019 at 16:48
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    \$\begingroup\$ Yep. Intrusion alarm on the control box. Call the cops whilst the bad guys are still beating on the housing of the controller. \$\endgroup\$
    – JRE
    May 18, 2019 at 16:50

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