Waveshare 4.2" E-Ink display

Other Hardware Displays
1

Hi There,

I have a Waveshare 4.2" e-ink display that i want to connect to my Lolin NodeMCU.

Installed the library in my Arduino IDE and can download the example program perfectly when the dispplay isn't connected to the NodeMCU.

As soon as I connect the display, I can't download my program anymore. IDE tells me "Failed to connect to ESP8266: Timed out waiting for packet header"

Connected the display as stated in the example program:
// mapping suggestion from Waveshare SPI e-Paper to generic ESP8266
// BUSY -> GPIO4 (D2)
// RST -> GPIO2 (D4)
// DC -> GPIO0 (D3)
// CS -> GPIO15 (D8)
// CLK -> GPIO14 (D5)
// DIN -> GPIO13 (D7)
// GND -> GND (G)
// 3.3V -> 3. (3V)

Anyone an idea what the issue could be?

UPDATE: It compiles, but can't connect to the controller. Works when I disconnect the 3V3 and GND I can upload the program and get data in the serial monitor, but as soon as I plug them in again... nothing and serial monitor is quiet.

2

Try with a 3.3k pull-up from CS to 3.3V.

3

ZinggJM:
Try with a 3.3k pull-up from CS to 3.3V.

Any explanation on that?

4

ZinggJM:
Try with a 3.3k pull-up from CS to 3.3V.

Pulling CS down to GND with 3k2 works!
Thanks a lot!

5

Yes, it is pull-down. See also:
Re: Waveshare e-paper displays with SPI #1236
Re: Waveshare e-paper displays with SPI #1487