//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
// #include <Wire.h> 
#include <LiquidCrystal_I2C.h> 
#include <avr/delay.h>

#define pinOutput PD4 
#define pinOn(port,pin) (port |= (1<<pin)) 
#define pinOff(port,pin) (port &= ~(1<<pin))   

uint8_t stunde = 0; 
uint8_t minute = 0; 
uint8_t sekunde = 0; 
uint8_t dauerEin = 6; 
uint8_t dauerAus = 18; 
uint32_t startZeit = 0; 
uint32_t dauer = 960; 


LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display





void updateTimer(){

  sekunde++; 
  if(sekunde == 60){ 
    minute++; 
    sekunde = 0;
    if (minute == 60){
      stunde++; 
      minute = 0;
    } 
    if(stunde == 24)
      stunde = 0;     
  } 
}


void updateDisplay(){

  uint8_t column; 

  column = 1; 
  lcd.setCursor(column,0); 
  lcd.print("00:00:00"); 

  column = 2;    
  if(stunde > 9){
    column = 1; 
  } 
  lcd.setCursor(column,0); 
  lcd.print(stunde); 
 
  column = 5;    
  if(minute > 9){
    column = 4; 
  } 
  lcd.setCursor(column,0); 
  lcd.print(minute); 

  column = 8;    
  if(sekunde > 9){
    column = 7; 
  } 
  lcd.setCursor(column,0); 
  lcd.print(sekunde); 
}


void initLed(uint8_t port, uint8_t pin){

  uint8_t anz = 3; 

  for(uint8_t d=0;d<anz;d++){
    pinOn(PORTD,pinOutput); 
    _delay_ms(500); 
    pinOff(PORTD,pinOutput); 
    _delay_ms(500);   
  }
}


void initLCD(){ 

  lcd.init(); 
  lcd.backlight(); 
  lcd.setCursor(2,0); 
  lcd.print("Candle-Timer"); 
  lcd.setCursor(0,1); 
  lcd.print("2024-01-02 V.01"); 
  _delay_ms(1000); 
  lcd.clear(); 
}


void setup(){ 

  DDRD |= (1<<pinOutput); 
  initLCD(); 
  initLed(PORTD,pinOutput); 
  startZeit = millis(); 
  pinOn(PORTD,pinOutput); 
}



void loop(){ 

  if(millis() - startZeit > dauer){
    updateTimer(); 
    updateDisplay(); 
    startZeit = millis(); 
  } 


}