#include <LiquidCrystal.h>

const int rs = 8, en = 9, d4 = 4, d5 = 5, d6 = 6, d7 = 7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
unsigned short secunde=0, miliSecunde=0, minute=40, ore=15;


unsigned int numar_CAN;
int voltageValue, temperatureRead, temperatureReadOld = -999;
unsigned int temp;
void setup()
{
  DDRD |= 0xFF;
  DDRB|=0x03;
  lcd.begin(0, 2);

  TCCR1A = 0;
    TCCR1B = 0;
    TCNT1 = 0;

    //Formula pentru OCR1A:
    //OCR1A = [16000000Hz/(1024*1Hz)]-1
    OCR1A = 15624;

    TCCR1B |= (1 << WGM12); //Mod CTC
    TCCR1B |= (1 << CS12) | (1 << CS10); //Prescaler 1024
    TIMSK1 |= (1 << OCIE1A); //Setare flag match
  DDRC&=~0x10;
  DDRD=B00001111;
  adc_init();
  lcd.print("Ora:");
  lcd.setCursor(0,1);
  lcd.print("Temp = ");
  Afis();


}
void Print0(int nr){
 if(nr < 10 && nr > 0) lcd.print('0');
}
void Afis(){

  lcd.setCursor(4,0);
  Print0(ore);
  lcd.print(ore);
  lcd.print(':');
  Print0(minute);
  lcd.print(minute);
  lcd.print(':');
  Print0(secunde);
  lcd.print(secunde);
     numar_CAN=read_adc(4);
     temp=read_adc(5);
     voltageValue=(temp*5000.0)/1024.0;
     temperatureRead=(voltageValue-500)/10;
  if( temperatureRead == temperatureReadOld) return;
    else lcd.setCursor(7,1);
     Print0(temperatureRead);
     lcd.print(temperatureRead);
     lcd.print("'C");
}
void loop(){



}
ISR(TIMER1_COMPA_vect){


   ++secunde;

  if(secunde ==  60){
    ++minute;
    secunde = 0;
  }
  if(minute == 60){
   ++ore;
    minute = 0;
  }
  if(ore == 24)
    ore = 0;
    Afis();

}
void adc_init() //adc initialization
{
  //set division factor between system clock frequency and the input clock to the ADC- 128
  ADCSRA |= ((1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0));
  ADMUX|=(1<<REFS0); //AVcc with external capacitor at Aref pin
  ADCSRA|=(1<<ADEN); //enable ADC
  ADCSRA|=(1<<ADSC); //ADC start conversion
}

uint16_t read_adc(uint8_t channel)
{
  ADMUX&=0xF0; //set input AO to A5
  ADMUX|=channel; //select chanel AO to A5
  ADCSRA|=(1<<ADSC); //start conversion
  while(ADCSRA & (1<<ADSC)); //wait while adc conversion are not updated
  return ADCW; //read and return voltage
}