A clock with an e-ink display for my desk
https://www.waveshare.com/4.2inch-e-paper-module.htm
https://www.waveshare.com/wiki/4.2inch_e-Paper_Module
| Display | Raspberry Pi GPIO |
|:-------:|:-----------------:|
| VCC | 3.3V |
| GND | GND |
| DIN | 19 |
| CLK | 23 |
| CS | 24 |
| DC | 22 |
| RST | 11 |
| BUSY | 18 |