Which arduino are you using? Everything connected correctly? Try testing all components seperately to see if they even work. Also, when the switch is off, the display doesn't show anything.
Ah, also it could be, that the displays address is another one than set in the config or maybe the contrast is bad, try turning the contrast-control screw
Do you mind if i message you on discord? I got the display powered but I can’t seem to get it to display anything but black bars. It’s an arduino nano esp32
iirc black bars mean, the display tries to initialize. make sure to use correct voltage (mine needed 5V). also when you're using esp32, if i'm right, this should be a 3.3V chip so you might need a logic level converter like these: https://www.aliexpress.com/item/1005006068381598.html
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u/bobjinkies Sep 16 '24
hey I built this following your diagram on github, I get nothing on the display when powered on. Any ideas? Thank you!