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

RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 20, 4);

const int ledPin = 9;
const int potPin = A0;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  rtc.begin();

  pinMode(ledPin, OUTPUT);
  analogWrite(ledPin, 0);

  lcd.begin(20, 4);
  lcd.backlight();
  lcd.clear();
}

void loop() {
  // Membaca nilai dari potensiometer (0-1023)
  int potValue = analogRead(potPin);

  // Mengatur nilai dimming LED berdasarkan nilai potensiometer
  int ledValue = map(potValue, 0, 1023, 0, 255);
  analogWrite(ledPin, ledValue);

  // Menampilkan nilai potensiometer dan dimming LED di Serial Monitor
  Serial.print("Analog : ");
  Serial.println(potValue);
  Serial.print("LED : ");
  Serial.println(ledValue);
  Serial.print("Datetime : ");
  printDateTime();

  // Menampilkan nilai potensiometer dan dimming LED di LCD I2C
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Analog : ");
  lcd.print(potValue);
  lcd.setCursor(0, 1);
  lcd.print("LED : ");
  lcd.print(ledValue);
  lcd.setCursor(0, 2);
  lcd.print("Tanggal : ");
  lcd.print(rtc.now().timestamp(DateTime::TIMESTAMP_DATE));
  lcd.setCursor(0, 3);
  lcd.print("Waktu : ");
  lcd.print(rtc.now().timestamp(DateTime::TIMESTAMP_TIME));

  delay(500);
}

void printDateTime() {
  DateTime now = rtc.now();
  Serial.print(now.timestamp(DateTime::TIMESTAMP_DATE));
  Serial.print(" ");
  Serial.println(now.timestamp(DateTime::TIMESTAMP_TIME));
}