// Constants for pins
const int LDR_PIN = A0;          // LDR sensor pin
const int TRIGGER_PIN = 9;       // Ultrasonic sensor trigger pin
const int ECHO_PIN = 10;         // Ultrasonic sensor echo pin
const int LED_PIN = 13;          // LED pin

// Constants for array values
const int LDR_ARRAY_VALUE = 1;
const int ULTRASONIC_ARRAY_VALUE = 2;
const int DONE_ARRAY_VALUE = 3;

// Function prototypes
void readLDR();
void readUltrasonic();
void printMessage(const char* message);

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(LDR_PIN, INPUT); // Set LDR pin as input
  pinMode(TRIGGER_PIN, OUTPUT); // Set trigger pin as output
  pinMode(ECHO_PIN, INPUT); // Set echo pin as input
  pinMode(LED_PIN, OUTPUT); // Set LED pin as output
}

void loop() {
  int dataArray[] = {1, 2, 3}; // Array of values {1, 2, 3}

  for (int i = 0; i < sizeof(dataArray) / sizeof(dataArray[0]); i++) {
    Serial.println(i);
    int dataValue = dataArray[i]; // Get the current value from the array

    if (dataValue == LDR_ARRAY_VALUE) {
      readLDR();
    }
    else if (dataValue == ULTRASONIC_ARRAY_VALUE) {
      readUltrasonic();
    }
    else if (dataValue == DONE_ARRAY_VALUE) {
      printMessage("Done");
    }

    digitalWrite(LED_PIN, HIGH); // Turn on LED to indicate data read
    delay(500); // Wait for 0.5 seconds
    digitalWrite(LED_PIN, LOW); // Turn off LED
    delay(500); // Wait for 0.5 seconds
  }
}

void readLDR() {
  int ldrValue = analogRead(LDR_PIN); // Read LDR sensor value
  if (ldrValue < 100) { // Assuming low intensity if LDR value is less than 100
    printMessage("LIGHT LOW");
  }
}

void readUltrasonic() {
  long duration, distance;
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Convert time to distance
  if (distance < 20) { // Assuming near if distance is less than 20 cm
    printMessage("Distance Near");
  }
}

void printMessage(const char* message) {
  Serial.println(message);
}