Help with Displaying Red Color on Waveshare 4.2inch e-Paper Module (B) with ESP32

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1

Hello,

I am trying to display red color using the Waveshare 4.2inch e-Paper Module (B) (Black, White, Red) connected to an ESP32. I am using the following setup:

cpp

코드 복사

GxEPD2_3C<GxEPD2_420_SE0420NQ04, GxEPD2_420_SE0420NQ04::HEIGHT> display(GxEPD2_420_SE0420NQ04(/*CS=D8*/ EPD_CS, /*DC=D3*/ EPD_DC, /*RST=D4*/ EPD_RST, /*BUSY=D2*/ EPD_BUSY));

With this configuration, I can display black and white perfectly. However, the code seems to lack support for color. I tried modifying the code by changing the data in void GxEPD2_420_SE0420NQ04::_InitDisplay() from 0x00 to 0x0F. This allowed me to get a red display, but I am unsure how to properly structure the code to support this in a standard way.

I am currently waiting for the next update, but I wanted to check if there is any existing code that supports this. Any help or guidance would be greatly appreciated.

Thank you!

Leon

2

DroneBotWorkshop shows how to display red color on e-paper.

3

It might be a better idea to start with the GxEPD2_420c_Z21 driver class.

//#define GxEPD2_DRIVER_CLASS GxEPD2_420c_Z21 // GDEQ042Z21  400x300, UC8276, (hidden)
1 Like
4

Thank you! It works perfectly!
I found that using UC8276C with GxEPD2_420_SE0420NQ04 was not the correct match, and there was another suitable option.

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