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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

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.

jamez 6y ago
Thanks for the suggestions! Thermoelectric energy harvesting never even occurred to me. Definitely looking into it.
captn3m0 6y ago
+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.
- m463 6y ago
  https://inkplate.io/ https://inkplate.io/ fits that bill, but I think this project with solar does much better
- bert2002 6y ago
  Always tried to make the ESP32 fetch an image, but never succeeded (with Arduino though)
  - stevekemp 6y ago
    I setup an ESP8266, (wemos mini-d1), to fetch a remote image and display it: https://steve.fi/hardware/d1-epaper/ 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.