Hello,
I was wondering what pins i should use for my LCD display. I have it one my other arduino board connected like the image below. Also, i have a HC-SR04 that needs to be connected that takes priority over the display.
The main pins which are used by the onboard motor controller are digital pins 5 to 8.
So long as these pins are not used by the LCD, you should be fine.
Note that we also don’t suggest using digital pins 0 or 1 as they are for serial communication.