#include <Servo.h>
Servo myservo1;  
Servo myservo2;  
int pos1 = 0;  
int pos2 = 0;  

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

void loop() {
  for (pos1 = 0, pos2 = 0; pos1 <= 180 && pos2 <= 180; pos1 += 10, pos2 += 15) {
    myservo1.write(pos1);
    myservo2.write(pos2);
    delay(500);
  }

  for (pos1 = 180, pos2 = 180; pos1 >= 0 && pos2 >= 0; pos1 -= 10, pos2 -= 15) {
    myservo1.write(pos1);
    myservo2.write(pos2);
    delay(500);
  }
}