#include <LiquidCrystal.h> //
LiquidCrystal lcd(2, 3, 4, 5,  6, 7); //conexiuni LCD

#define buton_start  10 // buton start
#define buton_stop   9 // buton stop
#define buton_reset  8 //buton reset
#define led A5 
#define buzzer 13

int  ss=0, ms=0; 
bool timerStart = false;

void setup() { 

pinMode(buton_stop,  INPUT_PULLUP);
pinMode(buton_reset, INPUT_PULLUP);
pinMode(buton_start,  INPUT_PULLUP);
pinMode(led,OUTPUT);  

pinMode(buzzer,OUTPUT); 

lcd.begin(16, 2); 

 
//Setari Timer 1 
noInterrupts();         
 TCCR1A = 0;            
 TCCR1B  = 0;            
 TCNT1  = 0;            
 OCR1A = 1999;          
 TCCR1B |= (1 << WGM12); 
 TCCR1B |= (1 << CS11); 
 TIMSK1 |= (1 << OCIE1A);
 interrupts();         

}

void  loop() {

if(digitalRead (buton_start) == 0){ 
timerStart = true; 
delay(100);
}

if(digitalRead  (buton_stop) == 0){ 
timerStart = false;  
delay(100);
}

if(digitalRead (buton_reset) == 0){ 
ms=0, ss=0; 
delay(100);
}

lcd.setCursor  (0,0);
lcd.print("   Cronometru   ");
lcd.setCursor (5,1);
lcd.print("00");
lcd.print(":");
lcd.print((ss/10)%10);
lcd.print(ss%10);
//lcd.print(":");
//lcd.print((ms/100)%10);
//lcd.print((ms/10)%10);
//lcd.print(ms%10);


if ((ss >=15) && (ss<= 25)){
digitalWrite(led, HIGH);  
}
else{
    digitalWrite(led, LOW);  
}

if ((ss >=26) && (ss<= 40)&&(ss%2==0)){
digitalWrite(led, HIGH);  
}
if ((ss >=26) && (ss<= 40)&&(ss%2 >0)){
digitalWrite(led, LOW);  
}
  
  
}


ISR(TIMER1_COMPA_vect){   
if(timerStart == true){ ms=ms+1;
                       if(ms>999){ms=0;ss=ss+1;
                       if(ss>59){ss=0; }

                                }  
                      }
}