I have several Arduinos and 3 hy-div268n-5v. Do I really need a GRBL shield to control the controllers. And if not what I/O pins do I hook the hy-div268n-5v up to. Thanks.
The connections are here: Connecting Grbl · grbl/grbl Wiki · GitHub You can get by without a shield, but I don't recommend it. I recommend a screw shield to keep the wires from working loose. It's the best $7 insurance you can buy.
Nope. I've wired in similar Chinese stepper drivers into Grbl and it ran just fine. Inventables has these types of drivers in their X-Controller. But, just make sure to triple check your wiring before powering anything. If things aren't grounded properly or are mis-wired, you can easily fry something. This is where a shield or a complete integrated Grbl controller has its advantages.
