I'm working on a project in which I have to control the speed of a DC motor using an analog PID(using op-amps). The input will be provided with a potentiometer. The issue is that I can't figure out how to provide the feedback(a voltage proportional to the speed) for this system without using a microcontroller, which I'm not allowed to use.
I was told it could be done by somehow coupling a potentiometer with the motor, but fail to understand how this would provide velocity feedback.
Is there any, not too difficult way to get velocity feedback of a motor without using a microcontroller?