#include <LiquidCrystal_I2C.h>
#include <sntp.h>
#include <WiFi.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

uint32_t previous;

int bell_pin = 2;

const char* tz = "MYT-8"; //your timezone
void setup() {
  // Init
  lcd.init();
  lcd.backlight();
  pinMode(2, OUTPUT);

  lcd.print("Connecting");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
  }
  lcd.clear();
  lcd.print("Connected!");
  configTime(0,0,"2.pool.ntp.org");
  setenv("TZ",tz,1);
}


void loop() {
  time_t now = time(NULL);
  struct tm *tmptr = localtime(&now);

  if(micros() - previous >= 500000){
    lcd.clear();
    char buffer[30];
    strftime(buffer, sizeof(buffer), "(%d-%m) %X", tmptr);
    lcd.print(buffer);
    previous = micros();
  }
  
  //add your timetable time here
  if(tmptr->tm_hour == 7 && tmptr->tm_min == 0 && tmptr->tm_sec == 0){
    digitalWrite(bell_pin,1);
  }

  if(tmptr->tm_hour == 7 && tmptr->tm_min == 0 && tmptr->tm_sec == 6){
    digitalWrite(bell_pin,0);
  }
  
}