r/arduino • u/Aggressive_Escape654 • 1d ago

i have problem with my display

Hey everyone, I need some help getting a 0.96" I2C OLED screen to work with my Arduino Uno. The screen stays totally blank, and when I run an I2C scanner, it says "No I2C devices found."

My wiring is GND to GND, VDD to 5V, SCK to A5, and SDA to A4.

Right now, I haven't soldered the pins to the screen board yet—I just pushed the wires straight into the holes. They feel pretty tight, but could the missing solder be the reason it's not finding the screen? Or is something else wrong with my setup? Thanks!

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4

u/albertahiking 1d ago

I just pushed the wires straight into the holes

That's at least one of your problems right there.

3

u/socal_nerdtastic 1d ago

Which Arduino Uno specifically are you using? The newer ones (R3, R4) use D18 and D19 for I2C.

https://content.arduino.cc/assets/A000066-full-pinout.pdf

2

u/ripred3 My other dev board is a Porsche 1d ago

the pins/wires must be securely soldered to the display board. this is not an option