I got a few used 9" e-paper signs for a good deal, I could probably figure them out if I could capture the transmitter protocol and spoof it with a SDR transmitter but I am probably just going to de-solder the display and use an official serial driver board from e-paper. The driver boards are about $20 but I was thinking to make a esp32 book reader or something with a few of them, I could probably have gotten by with a solar cell power and a attiny along with the driver but I really want to be able to beam books over via bluetooth or maybe wifi.
The other option is to get another epaper NFC driver board wihich is cool as it is powered form the NFC, this is something I hope to see as an add-on option fo rthe keyboard which I hope includes a i2c multiplexer so we can add stuff like that, I already have a i2c hub(cut the pogo pin traces and divert to hub then connect kb to the hub output), i2c nfc loop, and Qi charger loop waiting for a cram-in install once the pinephone keyboard is available form the store.
The other option is to get another epaper NFC driver board wihich is cool as it is powered form the NFC, this is something I hope to see as an add-on option fo rthe keyboard which I hope includes a i2c multiplexer so we can add stuff like that, I already have a i2c hub(cut the pogo pin traces and divert to hub then connect kb to the hub output), i2c nfc loop, and Qi charger loop waiting for a cram-in install once the pinephone keyboard is available form the store.