#include <Servo.h>
Servo left, right , back ;
int start = 3;

int val = 0;

void setup() {
  Serial.begin(9600);
  pinMode(start,INPUT);
  left.attach(5);
  right.attach(6);
  back.attach(9);

  left.write(180);
  right.write(0);
  back.write(0);

}

void loop() {
 val = digitalRead(start);
 if(val==HIGH){
  left.write(0);
  delay(1000);
  left.write(180);
  delay(500);
  right.write(180);
  delay(1000);
  right.write(0);
  delay(500);
  back.write(180);
  delay(1000);
  back.write(0);
  delay(500);
 }
 else{
  left.write(180);
  right.write(0);
  back.write(0);
 }

}