#include <Servo.h>

Servo myservo1, myservo2, myservo3;  // create servo object to control a servo

int potpin = A0;  // analog pin used to connect the potentiometer

int val;    // variable to read the value from the analog pin
int i = 0;
void setup() {
  myservo1.attach(9);  // attaches the servo on pin 9 to the servo object
    myservo2.attach(10);  // attaches the servo on pin 9 to the servo object
      myservo3.attach(11);  // attaches the servo on pin 9 to the servo object
}

void loop() {

  delay(1000);
  val = 500 * i ;// analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  i = !i;
  val = map(val, 0, 1023, 0, 180);     // scale it for use with the servo (value between 0 and 180)
  myservo1.write(val);                  // sets the servo position according to the scaled value
    myservo2.write(val+15);
  
   myservo3.write(val+30);
   delay(15);                           // waits for the servo to get there
}