#define BUZZER 2
#define BUTTON 12
#define LED_1 26
#define LED_2 25
#define CHN 0
void setup()
{
  pinMode(BUZZER, OUTPUT);
  pinMode(BUTTON, INPUT);
  pinMode(LED_1, OUTPUT);
  pinMode(LED_2, OUTPUT);
  ledcSetup(CHN, 0, 10);
  ledcAttachPin(BUZZER, CHN);
  ledcWriteTone(CHN, 2000);
}

void loop()
{
  if (digitalRead(BUTTON) == LOW)
  {
    digitalWrite(LED_1, HIGH);
    digitalWrite(LED_2, LOW);
  }
  else
  {
    alert();
    delay(10);
    digitalWrite(LED_1, LOW);
    digitalWrite(LED_2, HIGH);
    ledcWriteTone(CHN, 0);
  }
}
 void alert()
 {
   float sinVal;
   int toneVal;
   for (int x = 0; x < 360; x += 10)
   {
     sinVal = sin(x * (PI / 180));
     toneVal = 2000 + sinVal * 500;
     ledcWriteTone(CHN, toneVal);
     delay(10);
   }
 }