#include <Servo.h>

Servo myservo1;
Servo myservo2;
Servo myservo3;

void setup() {
  
  myservo1.attach(9);
  myservo2.attach(10);
  myservo3.attach(11);

}

void loop() {
  
  for(int i=0; i<=180; i++){
  myservo1.write(i);
  delay(500);
  i=i+10;

  myservo2.write(i);
  delay(500);
  i=i+10;

  myservo3.write(i);
  delay(500);
  i=i+10;

  } 

}