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.

  • CBProjects@lemmy.world
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    11 months ago

    I saw a similar device in a friends new build 3-4 years ago. It used the energy from you pressing the switch to transmit to the fitting.

      • henchman2019@lemmy.world
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        11 months ago

        Those worked by sound. No power was needed or generated by the remote.

        From the article…

        By pressing a button on the remote, you set off a spring-loaded hammer that strikes a solid aluminum rod in the device, which then rings out at an ultrasonic frequency.

        I THINK I even remember, way back, random channel changes from tapping on a drinking glass or something similar… Cool tech for the time