I've actually just received one of these HATs (the crashing version), and found this issue because my Pi Zero was crashing. Thanks for all the suggestions here. Instead of messing around with capacitors, wouldn't it be simpler to do this:
remove (clip off / unsolder) the 5V pin(s) from the Pi header attach the HAT to the Pi solder a wire from the 3.3v pin to VCC on the HAT
Works with GxEPD library using GxGDEW0213Z16 display type. Not GxEPD2 :-(
By now you know this repository is crap. This is what worked for me on a 1.54 e-ink display. It should work on other sizes as well.
NOTE: This display requires 3.3 data lines. It works on 5v data lines, but just barely. The display is not crisp. I've read it's possible to use a 10k/4k7 resistor divider for 5v data lines, but it didn't work for me.
Download this library https://github.com/ZinggJM/GxEPD
From Arduino IDE, open the example
Select this display #include <GxGDEH0154D67/GxGDEH0154D67.h> // 1.54" b/w
Use these pins GxIO_Class io(SPI, /CS=/ 10, /DC=/ 9, /RST=/ 8); GxEPD_Class display(io, /RST=/ 8, /BUSY=/ 7);
Connect as follows (display / arduino): VCC / VCC GND / GND D/C / D9 SDI / D11 CS / D10 CLK / D13 BUSY / D7
