#include <Servo.h>
Servo myservoLeft;
Servo myservoRight;

int angle =0;

void setup() {
  // put your setup code here, to run once:
  myservoLeft.attach(10);
  myservoRight.attach(9);
}

void loop() {
  // put your main code here, to run repeatedly:
  for(angle = 90; angle <180; angle++){
    myservoLeft.write(angle);
    myservoRight.write(180 - angle);     
    
    delay(20);
  }
  for(angle = 180; angle >= 90; angle--){
    myservoLeft.write(angle);
    myservoRight.write(180 - angle);
 
    
  }
  
}