int lightPin = 0;  //define a pin for Photo resistor
int buzzer = 9;
int button = 2;

void setup()
{
    Serial.begin(9600);  //Begin serial communcation
    pinMode(buzzer, OUTPUT);
    pinMode(button, INPUT);
}

void loop()
{
    int val = analogRead(lightPin);
    if(val < 250){ //adjust val for room
      while(1){
        if(digitalRead(button) == HIGH){
           noTone(buzzer);
           break;
        }
        else tone(buzzer, 261);
     }
    }
    else{
      noTone(buzzer);
    }
    Serial.println(analogRead(lightPin)); //Write the value of the photoresistor to the serial monitor.

   delay(100); //short delay for faster response to light.
}