The system below consists of a small electric DC motor that drives a dial. You can control the position of the dial by changing the input voltage to the motor using the slider or the "d", "f" and "s" keys. You can also change the characteristics of the system by changing the inertia of the dial and the system friction. As you change the input voltage to the motor you should observe that the speed of the motor is proportional to the input voltage. The mathematical model is derived in Example 2.1
The system below does not include a controller. You need to act as the controller. Experiment with controlling the position of the dial. To do this you will need to turn the motor on and off (or even reverse its direction) until the dial stops at the desired location.