void setup() {
  pinMode(2, OUTPUT); // LED 1
  pinMode(3, OUTPUT); // LED 2
  pinMode(4, OUTPUT); // LED 3
  pinMode(5, OUTPUT); // LED 4
  pinMode(6, OUTPUT); // LED 5
  pinMode(7, OUTPUT); // LED 6
  pinMode(8, OUTPUT); // LED 7
  pinMode(9, OUTPUT); // LED 8
  pinMode(10, OUTPUT); // buzzer

}

void loop() {
  digitalWrite(9, LOW);   // Turn OFF LED 8
  digitalWrite(2, HIGH);  // Turn ON LED 1
  digitalWrite(10, HIGH);  // Turn ON buzzer
  delay(500);   

  digitalWrite(2, LOW);   // Turn OFF LED 1
  digitalWrite(3, HIGH);  // Turn ON LED 2
  delay(500);  

  digitalWrite(3, LOW);   // Turn OFF LED 2
  digitalWrite(4, HIGH);  // Turn ON LED 3
  digitalWrite(10,  LOW);  // Turn ON buzzer
  delay(500);  

  digitalWrite(4, LOW);   // Turn OFF LED 3
  digitalWrite(5, HIGH);  // Turn ON LED 4
  delay(500); 

  digitalWrite(5, LOW);   // Turn OFF LED 4
  digitalWrite(6, HIGH);  // Turn ON LED 5
  delay(500);  

  digitalWrite(6, LOW);   // Turn OFF LED 5
  digitalWrite(7, HIGH);  // Turn ON LED 6
  digitalWrite(10, HIGH);  // Turn ON buzzer
  delay(500);  

  digitalWrite(7, LOW);   // Turn OFF LED 6
  digitalWrite(8, HIGH);  // Turn ON LED 7
  delay(500);   

  digitalWrite(8, LOW);   // Turn OFF LED 7
  digitalWrite(9, HIGH);  // Turn ON LED 8
  delay(500);  
  digitalWrite(10, LOW);  // Turn ON buzzer

  

}