Servo control

Okay, imagine you have a robot arm made out of Lego bricks. You want to control the movements of the arm, so you attach a small motor called a servo to it. This motor can turn the arm to different positions, like moving it up or down or left or right.

To make the servo move, you send it a signal from a controller (like a remote control or computer program). The servo will then turn its shaft to the angle you specified in the signal.

But how does the servo know when to stop turning? That's where the control part comes in. Inside the servo is a little device called a potentiometer that measures the angle of the arm. It sends this information back to the controller, which adjusts the signal to the servo to make it stop turning when the arm is in the right position.

So, think of it like playing a game of "Hot and Cold." You give the servo a signal to move the arm, and it starts turning. As it gets closer to the desired position, the potentiometer tells the controller "warmer," and the controller adjusts the signal to slow down the movement. When the arm is in the right spot, the potentiometer says "hot," and the controller stops the servo from turning.

And that's how servo control works! It's like a little robot game of "Hot and Cold" to make sure the arm moves to just the right position.