const int myLED = 4;
void setup() {
  // put your setup code here, to run once:
 
    pinMode(myLED,OUTPUT);
  
}
void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(myLED, HIGH);
  delay(1000);
  digitalWrite(myLED,LOW);
  delay(1000);
  
}