All used pins set up on output. But, really, is it correct connections?
Why it used A* input pins, and, digital pins set up on output, it is right?
Maybe all pins need used by digital pins with NPN transistors? Collector is 5V, Base - Arduino digital pin, emitter - resistor with display anode, next, collector is display segment pin, Base - Arduino digital pin, emitter - Ground.
What resistance is needed for the resistor? I think, more than 220 Ohm?
Sorry, but I'm really a beginner in electronics.