Batteryless Wireless Doorbell

It’s not magic. It’s just kinetic energy.

YouTube channel Techmoan took apart a wireless doorbell to figure out what made it tick. The doorbell was a little unusual: There was no battery or wiring needed, yet it seemed to ring just fine. What Techmoan found on the inside was a piezoelectric device. Essentially, the doorbell has a teeny-tiny alternator. Pushing down on the button creates a mechanical force, and piezoelectricity uses this as a micro-power source to produce a low-power signal. It’s just enough to ring the doorbell, and can theoretically withstand frequent usage.

Piezoelectric technology has been around since the late 19th century. The basic mechanism is the tension or stress from deformation of the underlying mechanical parts, something akin to very slight amounts of kinetic energy. Piezoelectric devices are commonly incorporated into crystal radios, as quartz is a piezoelectric conductor affected by vibrations.

Article by  Mar 16, 2016

  • Alternatively a batteryless operation for a light switch that could toggle the heliostat would be most convenient.
  • Could be used in conjunction with a solar powered pulse motor mechanism to create an emotional remote control for the heliostat.

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