The average hobby servo looks like this:
Also pictured are common accessories: some different arms, and mounting screws/washers. The wire ends terminate in a solid socket of three: perfect for attaching to our PWM hat.
The motors we worked with last chapter have some very basic differences, and we should explore them before we start our servo project.
Unlike the motors we dealt with in the previous chapter, you can make precise and calculated movements with a servo. Name a degree between 0 and 180 on a regular servo, and it will go. Motors (excluding stepper motors, which aren't covered in this book) cannot make these precise movements. So if you're looking to make a wheel go and you don't care about accurate movements, use a motor. When you're looking to make the joint of a limb that needs to move precisely with other joints, time to use a servo.