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A comment on Batteries Not Included, or Required, for These Smart Home Sensors. Parent comment

Re:Batteries Not Included, or Required, for These Smart Home... by Terr_ on Wednesday May 06, 2026 @06:35AM (#48034636)
> for detecting other events like doors opening/closing etc.

If any of those doors are important for security, then I'd want something an intruder can't easily jam or spoof.

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Re:Batteries Not Included, or Required, for These Smart Home... by nh2 on Wednesday May 06, 2026 @10:27AM (#48036689)
A big benefit of piezo-powered electronics is that they can do all the usual stuff, such storing state, or cryptography to prevent spoofing, which the ultrasonic approach from the article cannot do.
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