Recent comments in /f/gadgets

CompassionateCedar t1_iv9ls4d wrote

Reply to comment by weizXR in Researchers create a Drone That Can 'See Through Walls' With Wifi | At the University of Waterloo recently fixed one up with a scanning device that is the definition of invasive. by chrisdh79

Actually you can use wifi signals to get a rough layout of a room. Not with this kind of setup, you would need a directional antenna.

It’s been demonstrated by a bunch of nerds messing around with a home made radio telescope years ago.

Wifi uses the electromagnetic spectrum. Just like light does. Except it can pass trough walls. So you can use it to “see” into a room but because of the wavelength is so large and it will pass trough a lot of stuff you will mostly see things that are highly reflective to wifi and other sources of electromagnetic radiation with the same wavelength.

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Emu1981 t1_iv9bde6 wrote

Reply to comment by Orcwin in Researchers create a Drone That Can 'See Through Walls' With Wifi | At the University of Waterloo recently fixed one up with a scanning device that is the definition of invasive. by chrisdh79

>The concept from the article has multiple radios, and can therefore do triangulation of the received signals.

It depends on how accurate of a fix you want. I have a old router that could do fairly accurate Wi-Fi triangulation but the accuracy decreased as the RF clutter increased (e.g. walls between the router and the device).

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Frankie_T9000 t1_iv94n5h wrote

Reply to comment by pixelbased in Researchers create a Drone That Can 'See Through Walls' With Wifi | At the University of Waterloo recently fixed one up with a scanning device that is the definition of invasive. by chrisdh79

>Aside, this thing is horrific and doesn’t need to be made

Really? Horriffic that it can see wifi signals and pinpoint them. This is old tech and the article is just sensationalism.

I dont know about anyone else, but im not stricken with fear about this, though I do wish people wouldnt do this sort of shit.

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EVOSexyBeast t1_iv93mpc wrote

Reply to comment by pixelbased in Researchers create a Drone That Can 'See Through Walls' With Wifi | At the University of Waterloo recently fixed one up with a scanning device that is the definition of invasive. by chrisdh79

No it doesn’t actually see through walls. It can approximate the location of wifi devices. You can do the same thing by walking outside the building with the device in hand. Drones make a lot of noise and it would probably be more stealthy to just walk up to the building.

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no-name-here t1_iv92hhq wrote

Reply to comment by weizXR in Researchers create a Drone That Can 'See Through Walls' With Wifi | At the University of Waterloo recently fixed one up with a scanning device that is the definition of invasive. by chrisdh79

Thank you for clarifying - the headline implies something incredibly different.

Regarding the price, another commenter said the drone and parts shown add over $500: https://www.reddit.com/r/gadgets/comments/yn87zd/researchers_create_a_drone_that_can_see_through/iv7uq2p/?utm_source=share&utm_medium=ios_app&utm_name=iossmf&context=3

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