ESP8266 Community Forum

- Sun Apr 04, 2021 10:38 am #91029 Hi there,

I'm struggling to get the e-Paper and the RTC shield work together smoothly. I'm aiming at a low power NTP based clock. Time should be kept by the RTC and once in every night it should get readjusted with NTP.

The problem I cannot solve is, that the e-paper and the RTC both use D2 (GPIO4).

I tried to adjust the last argument 4 (D2) to 12 (D6) in my line of code

Code: Select allGxEPD2_BW<GxEPD2_154_D67, GxEPD2_154_D67::HEIGHT> display(GxEPD2_154_D67(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0154D67

But then the e-Paper showed some weird behavior, i.e. it didn't update properly.

Any ideas? Is it possible to get the e-paper working without or with another BUSY-pin?

- Thu Apr 08, 2021 2:12 pm #91073 Instead of a pin "-1" can be taken for BUSY, see https://github.com/wemos/LOLIN_EPD_Library/blob/master/examples/graphicstest_2_13_inch_212x104_TRI-COLOR/graphicstest_2_13_inch__212x104_TRI-COLOR.ino