int i = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(A5, INPUT_PULLUP);
pinMode(8,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:


        while(digitalRead(A5) == LOW){
      digitalWrite(8, HIGH);
      delay(500);
      digitalWrite(8, LOW);
      delay(500);

      }


             
        
  }