#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Define pins
const int lightSensorPin = 34;  // Analog pin for light sensor (LDR)
const int ledPin = 2;          // LED connected to GPIO2

// Define threshold for light detection
const int LIGHT_THRESHOLD = 2000;  // Adjust based on your environment

void setup() {
  lcd.init();
  lcd.clear();
  lcd.backlight();
  // Initialize Serial Monitor
  Serial.begin(115200);

  // Set pin modes
  pinMode(lightSensorPin, INPUT);
  pinMode(ledPin, OUTPUT);

  // Display header
  Serial.println("PENDETEKSI CAHAYA");
  Serial.println("Program: Light Sensor Monitor");
  Serial.println("Nama: [Nurulia Firi Octaviani]");  // Replace with your name
  Serial.println("-----------------------------");
}

void loop() {
  // Read the analog value from the light sensor
  int lightValue = analogRead(lightSensorPin);

  // Print the analog value to Serial Monitor
  Serial.print("Nilai Analog: ");
  Serial.println(lightValue);

  // Check if light is detected
  if (lightValue < 2000) {
    // Light is detected (lower value means more light for LDR)
    Serial.println("ADA CAHAYA");
    lcd.setCursor(0, 0);
    lcd.print("ADA CAHAYA      ");

    digitalWrite(ledPin, HIGH);  // Turn on LED
  } else {
    // No light detected
    Serial.println("TIDAK ADA CAHAYA");
    lcd.setCursor(0, 0);
    lcd.print("TIDAK ADA CAHAYA");

    digitalWrite(ledPin, LOW);   // Turn off LED
  }

  Serial.println("-----------------------------");

  // Wait before next reading
  delay(1000);
}