Problem with Good Display 7inch B&W Eink GDEY075T7

[enviro500]

I just bought a 7.5inch Eink Display B&W from Good Display, model is GDEY075T7.

It comes with C02 module. I connected the module to an Arduino Uno (clone), following the pins stated in the sample code and uploaded the sample code to the Arduino.

GDEY075T7 Arduino Sample Code_GooDisplay

However, nothing changed on the Eink display.

By the way, the yellow thin cable thing isn't damaged, just slightly folded.

The switch on the C02 is switched to 0.47 (should be 0.47 according to the customer service staff).

I connected the 3.3V to 3.3V, GND to GND.

I also switched to different Arduinos I have and it still dosen't work.

I wanted to try and use my ESP32 VROOM 32U but I don't understand the sample code for ESP32.

GDEY075T7 ESP32 Sample Code_GooDisplay

void setup() {
   pinMode(A14, INPUT);  //BUSY
   pinMode(A15, OUTPUT); //RES 
   pinMode(A16, OUTPUT); //DC   
   pinMode(A17, OUTPUT); //CS   
   //SPI
   SPI.beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0)); 
   SPI.begin ();  
}

A14 pin on ESP32??? Isn't that for analogue on Arduino?

And just to add on somehow when i was uploading the code one time black spots started to appear and then it stopped turning the display from white to grey.

I am just really confused. Can someone help me. I would really appreciate it. Thank you!

[vnskynet]

Do you resolve this? I have same issue.

[davidyangarduino]

Hi friends! I’ve had issues with this display as well.
@vnskynet I'm not sure if this will help, but the Uno uses 5V logic on its pins. If your connector board doesn’t have a voltage level shifter, that might be the reason the display isn’t functioning properly. This display only accepts 3.3V and seems to be very sensitive to voltage levels. You might want to try using a 3.3V-based microcontroller or adding a logic level shifter.

I'm using the Xiao ESP32S3 with the E-paper Driver Board. My issue with the display is that whenever I load BMP images, the display briefly shows the image with proper contrast, then refreshes and quickly fades away.

I’m trying various ways to debug the code, but I’d love to know if anyone here:

1. Has experience loading BMP images over Wi-Fi to an e-ink display and getting them to render properly
2. Can help determine whether this is a hardware or software issue that’s causing the display to behave this way

[enviro500]

Hi, thanks for the help. Forgot to update but I managed to use a ESP32 clone and the display worked using GxEPD2 library a few months ago. The C02 has a built in voltage level shifter thing (apparently). Also the sample code in the website its for their own Arduino Unos and ESP32s and it should be different from Arduino uno clones.

[vnskynet]

@davidyangarduino UNO have 3.3v pin. Did you try to use? I tried but it isn't different.