As for the ESP32-CAM module that drives it all, ... When we need actuators for a project, a servo from the remote-control hobby world is a popular solution.

On the other hand, the Serial Servo based on ESP32 is a dedicated driver board for Serial Bus Servos, capable of controlling up to 253 servos simultaneously via the ESP32 serial port.

By leveraging 3D printing and off-the-shelf parts that are easy to source; just a handful (chuckle!) of potentiometers, some servo motors and one from any number of ESP32 dev boards and you’re done.

How to Build a Low-Cost Drone with ESP32 ... When combined with commercially available propellers and control modules, it looks like this. As you can see, the circuit board is exposed.