#define LED 2
#define BUZZER 4
void setup() {
  {
    pinMode(2,OUTPUT);
    pinMode(4,OUTPUT);
  
  }
}

 void loop() 
 {
  digitalWrite(2,LOW);
  delay(500); // this speeds up the simulation
  digitalWrite(2,HIGH);
  digitalWrite(4,LOW);
  delay(1000);
  tone(4,500,100);
   // this speeds up the simulation
 }