I really want to upgrade to at least 31" but it's rather expensive.
Separately in the next irritation of this project I'm hoping to use an ESP32 instead of an RPi Zero to power it, and use the deep sleep mode so it can periodically update but sleep through the rest of the time, allowing a few months of battery life with no wire sticking out.
Even more ideal would be putting a thin strip of solar panel on the top edge of the frame to keep it charged, and use some kind of supercapacitor to power the ESP32, though I don't know if the parts for that exist, especially solar panel that is 1cm wide.
https://dheera.net/projects/einkframe/
I really want to upgrade to at least 31" but it's rather expensive.
Separately in the next irritation of this project I'm hoping to use an ESP32 instead of an RPi Zero to power it, and use the deep sleep mode so it can periodically update but sleep through the rest of the time, allowing a few months of battery life with no wire sticking out.
Even more ideal would be putting a thin strip of solar panel on the top edge of the frame to keep it charged, and use some kind of supercapacitor to power the ESP32, though I don't know if the parts for that exist, especially solar panel that is 1cm wide.