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

const char *ssid     = "Wokwi-GUEST";
const char *password = "";

#define trigger 26
#define echo    25
int waktu;
float jarak;

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");
String weekDays[7]={"Ahad", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"};
String months[12]={"Januari", "Februari", "Maret", "April", "Mei", "Juni", "Juli", "Agustus", "September", "Oktober", "Nopember", "Desember"};
int jam,menit,detik,tanggal,bulan,tahun;
char buff[100];

void setup() {
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print(" JAM DIGITAL ");
  lcd.setCursor(0,1); lcd.print("Connecting...");
  pinMode(trigger,OUTPUT);
  pinMode(echo,INPUT_PULLUP);
  Serial.begin(115200);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  lcd.setCursor(0,1); lcd.print("WiFi Connected...");
  timeClient.begin();
  timeClient.setTimeOffset(25200);
  delay(1000);
}

void baca_sensor() {
  digitalWrite(trigger,HIGH); delayMicroseconds(10);
  digitalWrite(trigger,LOW);  delayMicroseconds(10);
  waktu = pulseIn(echo, HIGH);
  jarak = waktu * 340.0 * (100.0/1000000.0)/2.0;
  lcd.setCursor(0,0); lcd.print("Jarak = ");
  lcd.print(jarak,1); lcd.print(" cm  ");
  delay(300);
}

void loop() {
  delay(10); // this speeds up the simulation
  baca_sensor();
  timeClient.update();
  time_t epochTime = timeClient.getEpochTime();  
  String formattedTime = timeClient.getFormattedTime();
  jam   = timeClient.getHours();
  menit = timeClient.getMinutes();
  detik = timeClient.getSeconds();

  String hari = weekDays[timeClient.getDay()];  
  struct tm *ptm = gmtime ((time_t *)&epochTime); 
  tanggal = ptm->tm_mday;
  bulan = ptm->tm_mon+1;
  tahun = ptm->tm_year+1900;
  
  String nama_bulan = months[bulan-1];
  
  sprintf(buff,"JAM %02d:%02d:%02d WIB",jam,menit,detik);
  lcd.setCursor(0,1); lcd.print(buff);
}