ESP32 + OLED sd1306 different behaviour USB power vs direct power

odaller
Posts: 1
Joined: Sun Apr 14, 2019 6:31 pm

ESP32 + OLED sd1306 different behaviour USB power vs direct power

Postby odaller » Sun Apr 14, 2019 6:37 pm

Hello,

I encounter the weirdest problem: with my H-ET LIVE MiniKit ESP combined with "1.54 inch SSD1309 OLED Display Module 128x64 I2C Interface OLED 3.3-5V Compatible With SSD1306"

I use I2C communication and the SSD1306 library.

When I power my ESP module with an USB cable from a wall adapter, the screen starts without problems and everything seems to work fine.
However, when I power the ESP module directly with 5v into the VCC pin, the screen only shows random pixels. The esp boots up fine, since i can still reach the webpage it provides.

Anyone ideas how to fix this?

Thanks

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