Why don’t you statically allocate local IPs for each esp32 you have and have each one of them run their own simple web server. Then just print out a qr code that points your phone to the IP address of that device and have the device serve up information on your phone rather than an eink display. That way there is no need for the qr code to change and therefore no need for an eink display.
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Why don’t you statically allocate local IPs for each esp32 you have and have each one of them run their own simple web server. Then just print out a qr code that points your phone to the IP address of that device and have the device serve up information on your phone rather than an eink display. That way there is no need for the qr code to change and therefore no need for an eink display.