I designed a display breakout for some DL1416 display modules I like the look of. I used 1x PFC8574 to control the 7-bit data lines to the display via I2C. I still use 6 pins to control things like CE0/CE1 (which display module I’m talking to), and A0/A1 (which position within the chip I’m writing to), Cursor, and ‘Write Data.’
The question I have is what makes sense? Should I add another PFC8574 IO expander and control these six inputs over i2c as well? I suppose then I could use ATtiny85/45 (8pins) with my displays.
I’ve tried to attach a picture of my display breakout here.