const int pinLDR = A0; 
const int pinLED = 9; 
const int pinBuzzer = 10; 

void setup(){
  pinMode(pinLDR, INPUT);
  pinMode(pinLED, OUTPUT);
  pinMode(pinBuzzer, OUTPUT);
}

void loop(){
  int valorLDR =
  analogRead(pinLDR); 
  if (valorLDR < 200) {
   
    digitalWrite(pinLED, HIGH);

  analogWrite( pinBuzzer, 128);
  } else {
    digitalWrite(pinLED, LOW);

   analogWrite(pinBuzzer, 0); 
  }
  delay(100);
}