Servo Motors

A motor with position feedback and a controller that drives it to a commanded position.

Easy

Hobby servos (SG90, MG996R) take a 50 Hz PWM signal: a pulse of about 1 ms → 0°, 1.5 ms → 90°, 2 ms → 180° (exact limits vary by servo).
Industrial servos use AC synchronous or BLDC motors with encoders and a servo drive running closed-loop position, speed and current control.

#include <Servo.h>
Servo s;
s.attach(9);
s.write(90);   // centre

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