#include <ESP32Servo.h>

#define SERVO_PIN 26 // ESP32 pin GPIO26 connected to servo motor

Servo servoMotor;

void setup() {
  servoMotor.attach(SERVO_PIN);
}

void loop() {
  for(int posDegrees = 0; posDegrees <= 180; posDegrees++) {
    servoMotor.write(posDegrees);
    Serial.println(posDegrees);
    delay(20);
  }

  for(int posDegrees = 180; posDegrees >= 0; posDegrees--) {
    servoMotor.write(posDegrees);
    Serial.println(posDegrees);
    delay(20);
  }
}