int ledr = 9;
int ledr2 = 8;
int Buzzer = 7;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledr, OUTPUT);
  pinMode(ledr2 , OUTPUT);
  pinMode(A0, INPUT);
  pinMode(Buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int Value = analogRead(A0);
  Serial.print("ValueLDR : ");
  Serial.println(Value);

  if (Value > 100){
    digitalWrite(ledr, HIGH);
    delay(1000);
    digitalWrite(ledr2, LOW);
    tone(Buzzer, 300);
  }
  else {
    digitalWrite(ledr, LOW);
    digitalWrite(ledr2, HIGH);
    delay(1000);
    tone(Buzzer, 0);
    noTone;
  }
}