Hello. I am working on a slider project using an Arduino Uno, an A4988 driver, an Arduino CNC shield, and a NEMA 17 motor. The Arduino Uno and CNC shield are connected to each other via pins. I am powering the CNC shield with a 12-volt battery or adapter. Do I need to provide additional power to the Arduino Uno? If so, how can I do that?
Yes. The shield does not provide power to the controller. USB is the first suggestion.
You can power the UNO from the battery, just power through Vin (barrel connector). This link may help: Using an Arduino CNC Shield V3 • AranaCorp