PCF8574 and SSD1306

[Marzalan]

Hello
How to get ssd1306 oled display to work in a same solution with digital in and out.
Both works in its own solution, but not together each others.
Looked like they are both using same clk and dma?

[admin]

they all use same i2c bus, but they have different i2c address. why can't work at the same time?
do you use esphome or arduino code?

[Marzalan]

I’ve been using arduino code

[admin]

check your code, it should be work at the same time.