#include <Servo.h>

Servo myServo;     
int buttonPin1 = 2;
int buttonState1 = 0; 
int Speed = 10; 

void setup() {
  myServo.attach(9); 
  pinMode(buttonPin1, INPUT);
}

void loop() {
  buttonState1 = digitalRead(buttonPin1);

  if (buttonState1 == HIGH) { 
    for (int pos = 0; pos <= 180; pos++) { 
      myServo.write(pos);         
      delay(Speed);       
    for (int pos = 180; pos >= 0; pos--) { 
      myServo.write(pos);          
      delay(5);       
    }
  }
 }
}