Robin2:
I can't see how they are connected. You need to ask on the Reprap Forum.I would suggest a Mega as it has lots of I/O pins and, like the Uno, it works at 5v. The Due works at 3.3v.
You can connect A4988 drivers to an Arduino without using a shield. The only purpose of the shield is convenience.
...R
Hello,
Here is a scheme
So, if I'm going to use Mega as controller, what can I use as shield for 8 motors, I know that I can use drivers with solder-able breadboard, but is not only convenience, I need to make it compact without extra parts to place inside the assembly box