#include <Servo.h>
Servo myservo;
int butn=12;
void setup() {
  // put your setup code here, to run once:
myservo.attach(9);
pinMode(butn, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int val=digitalRead(butn);
if(val==1){
  myservo.write(0);
  delay(200);
  myservo.write(90);
    delay(200);
  myservo.write(180);
    delay(200);
  myservo.write(90);
    delay(200);
  myservo.write(0);
}
 
}