const int greenLedPin = 2;
const int redLedPin = 3;
const int ldrPin = A0;
const int trigPin = 7;
const int echoPin = 6;

void setup() {
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  int dataArray[3] = {1, 2, 3};
  
  for (int i = 0; i < 3; i++) {
    Serial.print("Processing array element: ");
    Serial.println(dataArray[i]);

    switch (dataArray[i]) {
      case 1:
        readLDR();
        break;
      case 2:
        readUltrasonicSensor();
        break;
      case 3:
        turnOnBothLEDs();
        break;
      default:
        // Invalid array element
        break;
    }

    delay(1000); // adjust delay as needed
  }
}

void readLDR() {
  int ldrValue = analogRead(ldrPin);
  Serial.print("LDR Value: ");
  Serial.println(ldrValue);
  if (ldrValue < 500) { // If LDR detects low intensity
    digitalWrite(greenLedPin, HIGH); // Turn on green LED
  } else {
    digitalWrite(greenLedPin, LOW); // Turn off green LED
  }
}

void readUltrasonicSensor() {
  long duration, distance;
  digitalWrite(trigPin, LOW);  
  delayMicroseconds(2); 
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); 
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;
  
  if (distance < 20) { // If distance is less than 20 cm
    digitalWrite(redLedPin, HIGH); // Turn on red LED
  } else {
    digitalWrite(redLedPin, LOW); // Turn off red LED
  }
}

void turnOnBothLEDs() {
  digitalWrite(greenLedPin, HIGH);
  digitalWrite(redLedPin, HIGH);
}