Update doorsignEPD.ino #26
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GPIO 15 is used for external triggering of display refresh. I'm using am WeMos D1 mini with ESPEasy software to do so (http://<wemos_ip>/control?cmd=Pulse,13,1,100).
Since I am a arduino (and github) beginner please excuse my poor implementation if there are more elegant ways. But at least it's working.