#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// LCD setup
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pins
int ldrPin = A0;
int led1 = 9;
int led2 = 10;

// 🔧 Calibrated LDR values (adjust if needed)
int LDR_DARK = 600;   // value when light = 0
int LDR_LIGHT = 200;  // value when bright light

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

  lcd.init();
  lcd.backlight();

  Serial.begin(9600);
}

void loop() {
  int ldrValue = analogRead(ldrPin);

  // 🔁 Convert to percentage (corrected + calibrated)
  int brightnessPercent = map(ldrValue, LDR_LIGHT, LDR_DARK, 100, 0);
  brightnessPercent = constrain(brightnessPercent, 0, 100);

  // 💡 LED brightness control
  int ledBrightness = map(ldrValue, LDR_LIGHT, LDR_DARK, 255, 0);
  ledBrightness = constrain(ledBrightness, 0, 255);

  analogWrite(led1, ledBrightness);
  analogWrite(led2, ledBrightness);

  // 📺 LCD Display
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Light Level:");

  lcd.setCursor(0, 1);
  lcd.print(brightnessPercent);
  lcd.print("%");

  // 🖥 Serial Monitor (for debugging)
  Serial.print("LDR: ");
  Serial.print(ldrValue);
  Serial.print(" | %: ");
  Serial.print(brightnessPercent);
  Serial.print(" | LED: ");
  Serial.println(ledBrightness);

  delay(500);
}