const int ledPin1 = 13;    // setup pin numbers
const int ledPin2 = 12;
const int ldrPin = A0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode (ledPin1, OUTPUT);    // initialize LED1 as an output
  pinMode (ledPin2, OUTPUT);    // initialize LED2 as an output
  pinMode (ldrPin, INPUT);      // initialize LDR as an input
}

void loop() {
  // put your main code here, to run repeatedly:
  int ldrStatus = analogRead (ldrPin);  // read LDR value
  if (ldrStatus >=500) {                // if the value is higher than 500, both LEDs are off
    digitalWrite (ledPin1, LOW);
    digitalWrite (ledPin2, LOW);
    Serial.println("it's bright");
  }

  else if (ldrStatus < 300) {           // if the value is lower than 300, both LEDs is on
      digitalWrite (ledPin1, HIGH);
      digitalWrite (ledPin2, HIGH);
      Serial.println("it's too dark");

  }

  else {                               // if the value is lower than 500 but higher than 300, one of the LEDs is on
    digitalWrite (ledPin2, HIGH);
    digitalWrite (ledPin1, LOW);

    Serial.println("it's dark");    
  }
      
  Serial.print(ldrStatus);             // print LDR value with 500ms delay
  delay(500);
    

}