int Balarm = 13;
int PIRsensor = 2; 
int LedPin = 14;

void setup() {
  //Serial.begin(9600);
  pinMode(PIRsensor, INPUT); 
  pinMode(Balarm, OUTPUT);   
  pinMode(LedPin, OUTPUT);
}

void loop(){
  int state = digitalRead(PIRsensor); 
  delay(500);                         
    if(state == HIGH){                
      myTone(Balarm);
      digitalWrite (LedPin , HIGH); 
      delay(1000);  
    }
    else {
      myNoTone(Balarm);
      digitalWrite (LedPin , LOW);
    }
}

void myTone( int pin)
{
  ledcAttachPin(pin, 0);            
  ledcWriteNote(0, NOTE_F, 4);
}

void myNoTone( int pin)
{
  ledcDetachPin(pin);
}