#define LED 4
#define btn 5

void setup () {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
  pinMode(btn, INPUT);

}
// Blink Function
void Blink_LED(){
  for(int i=0;i<5;i++){
    digitalWrite(LED, HIGH);
    delay(500);
    digitalWrite(LED,LOW);
    delay(500);
  }
}
void loop (){
  bool ReadSwitch = digitalRead(btn);
  if (ReadSwitch == LOW){
    Serial.println("Pressed Switch");
    Blink_LED();
  }
}