For example, I have an unfinished, WiFi-enabled remote for digitally-controlled lights in my house.
One of the annoyances of the remote is that it needs power itself. If it could be powered by squeezing a button or lifting a weight, that would eliminate the need for a USB cable sneaking off to a little transformer brick somewhere
@s_ol I wonder if you could charge a capacitor with a squeeze crank like those hand-powered flashlights?
@ndpi @s_ol I don't have any experience with it, but one of the simplest circuits I've seen in this area is called a Joule Thief. It's often used to let low/expired batteries continue to power smaller devices.
I don't think this circuit will be all you need. You still need to supply it with a power source. But, it might be a component in a larger system design, in that the power source you end up using might not have to be so powerful.
Just an idea, or maybe something to help get you started.
@s_ol The new Sony remote uses RF harvesting to charge from your Wi-Fi signals, and also has a solar panel: https://www.theverge.com/2022/1/2/22860390/samsung-eco-remote-2022-solar-rf-harvesting-charging
What's even better is going batteryless, with hybrid or supercapacitors, see e.g. https://www.tindie.com/products/jaspersikken/solar-harvesting-into-lithium-ion-capacitor/
Thanks for the links! The solar harvesting board looks interesting, and it's very nice to have some real world reference numbers published there as well.
Battery less is definitely the goal, I wonder though if LI-caps are any better environmentally?
@s_ol Definitely better environmentally than Li-Ion batteries, but I would love to see a comparison with other storage technologies.
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