Measurement of the Rotation Speed RPM through an optical or a vibration sensor

Hardware and Software modules that allow the reading of the speed of rotation of a motor through the use of optical sensors, which detect discontinuities in the motor, for example the shaft key. In other applications the measurement of the rotation speed is carried out by reading the vibration of the motor, through an FFT spectral analysis and appropriate filtering, thanks to which the vibration frequency associated with the rotation speed is obtained.