disclosed herein is a system for controlling “ on ”/“ off ” functionality of an auxiliary device including a circuit designed to monitor physical rotations . the device will activate or deactivate when predetermined rotations are sensed by the circuit within a specific time period . the circuit can be used on high vibration tooling such as grinders and saws due to its resistance to relatively large vibrational noise . the circuit also includes a current sensing device to determine when the auxiliary device draws too much current . when an over current situation is measured , the circuit will automatically shut down to protect the device &# 39 ; s electronic components . this control system can be implemented in new device designs , or installed as a retrofit control mechanism to existing commercially available devices .