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Cool project! The ARM cpu is way overkill but gets easy setup points. You could probably get away with a hidden Peltier to harvest the room vs wall temperature difference if you switched a ULP core in many of the wifi micro controllers on the market. Thanks for sharing.

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+1. An ESP32 can fetch the image, display it, and go to deep-sleep with a much lower power output. The battery will last longer, but getting it much further is harder because electronics will degrade as well.

https://inkplate.io/ fits that bill, but I think this project with solar does much better

Always tried to make the ESP32 fetch an image, but never succeeded (with Arduino though)

I setup an ESP8266, (wemos mini-d1), to fetch a remote image and display it:

https://steve.fi/hardware/d1-epaper/

It wasn't easy as I couldn't get GIF/JPG, or similar, working. As the library I was using used a buffer my RAM usage was twice as much as expected. In the end I used a simple home-made RLE-kinda image encoding. Then I'd stream those updates.

Thanks for the suggestions! Thermoelectric energy harvesting never even occurred to me. Definitely looking into it.

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