#include <Arduino.h>


const int buzzer = 26;
const int led1 = 2;
const int led2 = 4;
const int led3 = 5;

void setup() {
  pinMode(buzzer, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  digitalWrite(led1, HIGH);
  tone(buzzer, 1000); // Play a 1 kHz tone on the buzzer
  delay(500);
  digitalWrite(led1, LOW);
  noTone(buzzer); // Turn off the buzzer
  delay(500);
  
  digitalWrite(led2, HIGH);
  tone(buzzer, 1500);
  delay(500);
  digitalWrite(led2, LOW);
  noTone(buzzer);
  delay(500);
  
  digitalWrite(led3, HIGH);
  tone(buzzer, 2000);
  delay(500);
  digitalWrite(led3, LOW);
  noTone(buzzer);
  delay(500);
}