#include <LiquidCrystal.h>

int z = 0;

LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

void setup(){
  lcd.begin(16, 2); 
  lcd.setCursor(0, 0);
  lcd.print("Time:00 L1 L2 L3");
  lcd.setCursor(9, 1);
  lcd.print("0  0  0");
  DDRB = 0x0F;
  DDRC = 0x00;
  PORTC |= 0x01;
  PORTB = 0x00;
  TCNT2 = 56;      
  TCCR2A = 0x00;       //normal mode
  TCCR2B = 2;          //หาร 8 clk = 2 MHz Time period = 0.5 uS
  TIMSK2 = 0x00;       //TOIE2 = 1
  sei();
}

void loop(){
  if((PINC&0x01)==0){
    while((PINC&0x01)==0){}
    TIMSK2 = 0x01;
  }
  
}

int k = 0,a=0;
ISR(TIMER2_OVF_vect){
  	if(k<10000) k+=1;
  	else {
    k=0;a++;
    lcd.setCursor(6, 0);
  	lcd.print(a);
    if(a>9){
        lcd.setCursor(5, 0);
  		lcd.print(a);
        lcd.setCursor(7, 0);
  		lcd.print(" "); 
      }
    if(a==5){
        PORTB |= 0x01;
      	lcd.setCursor(9, 1);
  		lcd.print("1");
      }
    else if(a==10){
        PORTB |= 0x02;
      	lcd.setCursor(12, 1);
  		lcd.print("1");
      }
    else if(a==15){
        PORTB |= 0x04;
      	lcd.setCursor(15, 1);
  		lcd.print("1");
      }
    }
    TCNT2 = 56;
}