framework-arduinoteensy-cxx20/libraries/PWMServo/examples/Knob/Knob.ino

// Controlling a servo position using a potentiometer (variable resistor)
// by Michal Rinott <http://people.interaction-ivrea.it/m.rinott>

// http://arduiniana.org/libraries/pwmservo/

//   Board                     SERVO_PIN_A   SERVO_PIN_B   SERVO_PIN_C
//   -----                     -----------   -----------   -----------
//   Arduino Uno, Duemilanove       9            10          (none)
//   Arduino Mega                  11            12            13
//   Sanguino                      13            12          (none)
//   Teensy 1.0                    17            18            15
//   Teensy 2.0                    14            15             4
//   Teensy++ 1.0 or 2.0           25            26            27
//   Teensy LC & 3.x                 (all PWM pins are usable)

#include <PWMServo.h>

PWMServo myservo;  // create servo object to control a servo

const int potpin = A0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

void setup() {
  myservo.attach(SERVO_PIN_A);         // attaches the servo on pin 9 to the servo object
  //myservo.attach(SERVO_PIN_A, 1000, 2000); // some motors need min/max setting
}

void loop() {
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 179);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);                  // sets the servo position according to the scaled value
  delay(15);                           // waits for the servo to get there
}