#include <ESP32Servo.h>
Servo myservo1;          // create servo object to control a servo
Servo myservo2;
Servo myservo3;
Servo myservo4;
int pos;

void setup() {
  myservo1.attach(5);   // set the control pin of servo 1 to 5
  myservo2.attach(16);  // set the control pin of servo 2 to 16
  myservo3.attach(17);  // set the control pin of servo 3 to 17
  myservo4.attach(18);  // set the control pin of servo 4 to 18
  
  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
    myservo1.write(pos);              // tell servo to go to position in variable 'pos'
    myservo2.write(pos);
    myservo3.write(pos);
    myservo4.write(pos);
    delay(15);                       // waits 15ms for the servo to reach the position
  }
  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo1.write(pos);              // tell servo to go to position in variable 'pos'
    myservo2.write(pos);
    myservo3.write(pos);
    myservo4.write(pos);
    delay(15);                       // waits 15ms for the servo to reach the position
  }
  delay(1000); 
}

void loop() {
  myservo1.write(90); 
  myservo2.write(90);
  myservo3.write(90);
  myservo4.write(90);
}