// Define pin numbers
const int ledPin1 = 1; // First LED
const int ledPin2 = 2; // Second LED
const int buzzerPin = 3; // Buzzer

void setup() {
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Turn on the first LED
  digitalWrite(ledPin1, HIGH);
  // Turn off the second LED
  digitalWrite(ledPin2, LOW);
  // Play a high-pitched tone
  tone(buzzerPin, 1000);
  delay(250); // Wait for 250 milliseconds
  
  // Turn off the first LED
  digitalWrite(ledPin1, LOW);
  // Turn on the second LED
  digitalWrite(ledPin2, HIGH);
  // Play a low-pitched tone
  tone(buzzerPin, 500);
  delay(250); // Wait for 250 milliseconds
}