//WHEN LIGHT THEN BUZZ FOR SEVEN SECONDS
#define time 7000;//defining time for 7s
const int LDR_PIN= A0;//define the LDR pin
unsigned long current_time= millis(),previous_ldr_time=0;

void setup() {
  // FOR LED pin number 10 is used as output
  pinMode(10, OUTPUT);
  pinMode(8, OUTPUT);//FOR BUZZER pin number 8 is used as output
  Serial.begin(9600);//initialising serial communication
  
}

void loop() {
  int play,stop;
  int ldr_value=analogRead(A0);//initializing the ldr pin
  current_time=millis();//return the number of milliseconds at the time
 previous_ldr_time=current_time;
 Serial.print("LDR value");
 Serial.println(ldr_value);
 // based on the ldr value the LED will glow and buzzer will be on
 if(ldr_value>250)
{
  digitalWrite(10, HIGH);
  tone(8,500,500);//plays 500HZ tone for 0.5seconds when led is ON
  previous_ldr_time=current_time;
  Serial.println("HIGH");
 }
 else
 {
  digitalWrite(10, LOW);//TO OFF LED
  tone(8,0,0);//BUZZER SHOULD BE STOPPED AND LED OFF
   previous_ldr_time=current_time;
  Serial.println("LOW");
 }
}