RasperryPi pico with an EInk Display (GDEY027T91)
SPI Pinout
Raspberry pi pico - gdey027t91
GP7 (pin 10) - BUSY
GP4 (pin 6) - RST
GP6 (pin 9) - DC
GP1 (pin 2) - CS
GP2 (pin 4) - CLK
GP3 (pin 5) - DIN
GND (pin 38) - GND
3V3 (pin 36) - VCC
Original repository https://github.com/martinberlin/CalEPD from the author Martin Fasani.