Servo

RC servos have a few advantages: - They are geared, so they are strong for their size - They know their position - They are easy to control with any microcontroller

The main disadvantage is that most of them can only rotate 180 degrees.

We've verified that this tutorial works with the Raspberry Pi Pico and Pico W, using MicroPython:

You can also use the Xiao RP2040, just use a different pin to control the servo. If you use pin 0, then you need to replace pin 15 in the code with pin 0. Here's the Xiao RP2040 pinout from Adrián Torres.

And if you want to use a potentiometer (a rotary knob with varying resistance) to control the position of a servo: