[mmastrac]

I read the technical description of this and the whole work seems like magic. Antenna design, extremely low-power passive networks, etc. On top of that, it can tap into network signal bursts as a communication medium.

It feels like a project sent from the future.

I've always been curious what energy harvesting systems are capable of.

Also, what is the third type of energy harvesting besides light and 2.4GHz? I couldn't figure out what that might be.

[yojo]

“At its core, the card harvests energy from light, radio, and/or a USB connection to enable the blinking of LEDs.”[0]

So the last is USB, the sneakily obvious one.

0: https://www.keacher.com/xmas24/tech_info.htm

[jotux]

Heat, voltage drop, and vibration are some other methods.

[mmastrac]

This card apparently has three - but none of those additional ones you listed, unfortunately.