Example code for Raspberry Pi Pico with 4.2" b/w/r ePaper and Si7021
The exmple code used the existing libraries for Micropython
Dominik Kapusta: micropython-waveshare-epd - https://github.com/ayoy/micropython-waveshare-epd
Mike Causer: micropython-waveshare-epaper - https://github.com/mcauser/micropython-waveshare-epaper
I merged both libraries to one. I'm able to use 4.2" b/w/r and easily change the text font and create lines, circles etc.