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submitted 1 year ago by L4s to c/technology

59 comments fedilink hide all child comments

Researcher has developed, at a cost of less than one dollar, a wireless light switch that runs without batteries, can be installed anywhere on a wall and could reduce the cost of wiring a house by ...::A U of A engineering researcher has developed a wireless light switch that could reduce the cost of wiring a house by as much as 50 per cent.

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[–] [email protected] 7 points 1 year ago (1 children)

It is totally possible to harvest energy from radio waves, it's just such a tiny amount that you could barely light a LED

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago) (1 children)

Yeah that's my point, the energy you can actually harvest is ridiculously small. Even if it was slowly charging a capacitor with this harvested power and saving it for later use, how often can i use the switch before depleting the energy faster than it charges? "oh sorry, you'll have to wait 5min to turn on your lights again, It's not quite charged enough"

[–] [email protected] 1 points 1 year ago

My guess is you would get a couple seconds of light before needing several hours to charge it up again.