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

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#define Led1    2
#define Up      15
#define Down    4
#define Pause   5

unsigned char Jam = 0, Menit = 0, Detik = 0;
bool isPaused = false;

void setup() {
  Serial.begin(115200);
  pinMode(Led1, OUTPUT);
  pinMode(Up, INPUT_PULLUP);
  pinMode(Down, INPUT_PULLUP);
  pinMode(Pause, INPUT_PULLUP);
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0 );       
  LCD.print("INTAN AULIA");
  LCD.setCursor(0, 1 );       
  LCD.print("TL2D");
  delay(1000);
  LCD.clear();
  LCD.setCursor(0, 0 );       
  LCD.print("Play");
  LCD.setCursor(0, 1);       
  LCD.print("Timer: ");
}

void loop() {
  if (!isPaused) {
    Detik++;
    digitalWrite(Led1, LOW);
    delay(500);
    digitalWrite(Led1, HIGH);
    delay(500);
  }
  
  if (digitalRead(Up) == LOW) {
    Menit++;
    if (Menit >= 60) {
      Menit = 0;
      Jam++;
      if (Jam >= 24) {
        Jam = 0;
      }
      LCD.setCursor(12, 1);
      LCD.print("    ");
    }
  }
  if (digitalRead(Down) == LOW) {
    if (Menit > 0) {
      Menit--;
    } else {
      if (Jam > 0) {
        Jam--;
      } else {
        Jam = 23;
      }
      Menit = 59;
    }
  }
  if (digitalRead(Pause) == LOW) {
    isPaused = !isPaused;
    if (isPaused) {
      LCD.setCursor(0, 0);
      LCD.print("Stop");
    } else {
      LCD.setCursor(0, 0);
      LCD.print("Play");
    }
  }

  LCD.setCursor(7,1);
  LCD.print(Jam);
  LCD.print(":");
  LCD.print(Menit);
  LCD.print(":");
  LCD.print(Detik);
}