I want to use 6 or 7 GDEM029C90 2.9" b/w/y 128x296 displays with SSD1680 controllers, all connected to a single controller board.
Which board should I use that is compatible with the GxEPD2 library?
You mean a single processor board?
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There is an example: GxEPD2_MultiDisplayExample.ino.
-jz-
Yes.
My understanding from the example is that the ESP32 can support a maximum of four displays. However, I'm not entirely sure. Could you please advise?
You can find out yourself. Count the remaining unused pins.
You need at least one separate pin for CS per display.
It would be better to also have one separate pin for BUSY and RST per display.
And you would need to decrease the page buffer per display to fit in available RAM.
For the large number of pins, I would choose an STM32 processor board with many pins.
But I would rather take one ESP32S2 (e.g. LOLIN S2 mini) per display, they are so cheap.
And create a multi-processor application. This could be extended for as many as ever needed.
-jz-
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A very important question is: will the displays be showing different images, or the same?
Different that is something like nixie clock
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