#define Led1 1
#define Led2 2
#define sw1 13
void setup() {
  pinMode(Led1, OUTPUT);
  pinMode(Led2, OUTPUT);
  pinMode(sw1, INPUT);
  
  digitalWrite(Led1, LOW);
  digitalWrite(Led2, LOW);
  

}
void loop() {
  int val = digitalRead(sw1);
  if(val == HIGH) {
  digitalWrite(Led1,LOW);
  digitalWrite(Led2, HIGH);
  delay(1000);
  digitalWrite(Led2,LOW);
  digitalWrite(Led1, HIGH);
  delay(1000);
 
  }
else{
  digitalWrite(Led1, LOW);
  digitalWrite(Led2, LOW);

  }
}