Making things move.
Rotational motion 0-180 degrees.
Another use of Pulse Width Modulation is driving the position of a servo motor.
https://www.arduino.cc/en/Tutorial/LibraryExamples/Sweep
analogWrite()
!)A knob is a kind of simple “sensor” to drive the servo motion.
Continous forward/backward motion controlled with PWM outputs. Including geared DC motors, which are a special instance of the above with slower rotation rate. [TK]
[TK]
Push (or pull) linear potion. Digital (on/off). [TK]
Very precise rotational motion (200 steps/rotation, typically), controlled with digital outputs. [TK]
[TK]
[TK]