The CNC Shield V4 (HW-702) is a compact expansion board designed for the Arduino Nano that enables control of small CNC machines, laser engravers, plotters, and other motion-control projects. It supports up to three stepper motors (X, Y, and Z axes) through plug-in stepper motor drivers such as the A4988 or DRV8825. The shield is compatible with GRBL firmware and provides connections for end-stop switches, spindle/laser control, and additional I/O interfaces, making it suitable for DIY CNC and automation applications.