[POSSIBLE SOLUTION] Low contrast on Waveshare 7.5" BW (FPC-C001)

[AdamJSchofield]

When I initially set up this project on my 7.5" BW Waveshare EPD with the Waveshare ESP32 driver board (v3), the DISP_BW_V2 macro called the GxEPD2_750_T7 constructor. I got a really washed out image with low contrast, which is an issue I have seen on some other forums while looking around for a fix.

I noticed the startup sequence did not match the Waveshare demo that works just fine. Eventually I came across this in the GxEPD examples and noticed the FPC-C001 identifier. Lo and behold, my ribbon matches. So I swapped out the constructors and this project works like a charm.

I got my display from Amazon. I am not sure if they ship different controller versions or what. I am more familiar with OLED display drivers.

I would be happy to submit a PR with and additional macro for this display type, but wanted to ask first. Maybe one of them are being phased out and I just got unlucky?