Comment on 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 ...

• luthis@lemmy.nz ⁨6⁩ ⁨months⁩ ago

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

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  • DreadPotato@sopuli.xyz ⁨6⁩ ⁨months⁩ ago

    Yeah that’s my point, the energy you can actually harvest is ridiculously small. Even if it was slowing 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”

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    • luthis@lemmy.nz ⁨6⁩ ⁨months⁩ ago

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

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