Arduino CNC controller 4-axis CNC control card The ARD-CNC-Kit2 is a specially developed expansion board that enables CNC machines to be controlled via an Arduino board. This kit stands out for its compatibility with GRBL v0.9, a popular open-source software package developed for CNC applications. Thanks to its support for GRBL v0.9, the ARD-CNC-Kit2 can utilise advanced features such as PWM (Pulse Width Modulation) for controlling spindle speed and the implementation of soft limits, which serve to keep the machine within safe operating limits. These functions are particularly important for users who require precise and safe machine control. The kit allows for the simultaneous control of up to four stepper motors, with each motor controlled by a DRV8825 motor driver. These drivers are renowned for their efficiency and reliability and are supplied with heat sinks that ensure optimal heat dissipation. This minimises the risk of overheating and the resulting damage or loss of performance.