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G6EJD / ESP32-e-Paper-Weather-Display

An ESP32 and 2.9", 4.2" or 7.5" ePaper Display reads Weather Underground data via their API and then displays the weather
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Difference waveshare hat rev 2.2 and rev 2.3 #241

Closed Radiofreund closed 5 months ago

Radiofreund commented 5 months ago

I have a problem with a new waveshare epaper hat revision 2.3. I have been running this project for a year with a 7.5 waveshare epaer b/w and a hat rev.2.2 without any problems. As I like the project so much, I wanted to build another one for my office. I ordered an epaper 7.5 b/w with has from waveshare. I noticed that the hat is now 9-pin and no longer 8-pin. At first I thought, no problem, I don't need the new "pwr" connection..., but the panel didn't work. Everything is ok on the old esp32 and the old one. I've been fiddling around for 1 week now, I read on waveshare that: Different versions: RST pin now is for reset control, and not for power on/off. Add a new PWR pin for power on/off.

https://www.waveshare.com/wiki/E-Paper_Driver_HAT

Unfortunately, the whole thing overwhelms me. Does anyone have any advice for me or new wiring?

Many thanks for any tips. RK

G6EJD commented 5 months ago

VCC - as Now GND - as now DIN/MOSI - as now CLK - as now CS - as now DC - as now RST - as now BUSY - as now PWR - connect to +3.3v

so just add 3.3v connection to PWR to turn the Panel on, or ground it to turn off, or use a spare GPIO pin set high for on, or low for off. Turning off the panels saves some power, but not much.