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markatlnk t1_iryp8n1 wrote

Reply to comment by BinniesPurp in Scientists have developed a low-cost small device (15x20cm) that can harness energy from wind as gentle as a light breeze and store it as electricity. With wind at 2 m/s the device can produce 3 volts and generate power of up to 290 microwatts (sufficient to power a commercial sensor) by nimnlil

As someone that teaches EE, 290 uW is more than enough to run a door bell. I have have microprocessor designs that have been running 21+ years on a single CR2477 battery with a 1 amp hour capacity. That is only taking 16 uW. You use a capacitor to store energy and use just a bit when someone pushes the door bell.

These units are based on an MSP430 processor with a 915Mhz transmitter. They do sleep 99.9x% of the time. Wake up every second for 50uS and once every 10 minutes for 0.25S when they need to transmit.

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BinniesPurp t1_ish2uu9 wrote

Sorry, to clarify I ment the speaker, not the sensor / button lol

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