/*  
  This program was written in the simplest possible way in order to prevent 
  a not excellent knowledge of programming language.  It is possible use it
  HOW IT IS only on the wokwi simulator
    
  For no reason the use of this code make the authors responsible and 
  even less obliges them to provide support and / or any explanation or 
  clarification
  However, if possible, we will try to answer to any questions, 
  without any obligation and / or commitment and / or responsibility
  by  https://www.facebook.com/groups/883620498953478 TEAM
   

      The user of this software will have total, complete 
      and exclusive responsibility for anythings.
      Anyone can modify it and adapt it to own needs,always reporting the 
      present declaration, even after important changes.

  These phrases will always reported in complete form, without this declaration
  there will be a copyright violation                        
  
  Thank you
*/


void setup() {
 pinMode(12,OUTPUT);
 pinMode(11,OUTPUT);
 pinMode(10,OUTPUT);
 pinMode( 9,OUTPUT);

 
// TIMER1 setup
  // reset
  TCCR1A = 0;
  TCCR1B = 0;

  TIMSK1 |= B00000001; // ISR TIMER1_OVF ON
  TCCR1B |= (1 << CS11)|(1 << CS10);  // set prescaler & start counter
}


volatile int i=-100;
ISR(TIMER1_OVF_vect)
{ i+=100;
TCNT1=55000; // set restart value counter
}

void loop() 
{  switch(i)
    { case     0: PORTB=0b00100000; break;
      case  1000: PORTB=0b00010000; break;    
      case  2000: PORTB=0b00001000; break;
      case  3000: PORTB=0b00000100; break;
      case  4000: PORTB=0b00000010; break;
      case  5000: PORTB=0b00000001; break;
      case  6000: PORTB=0b00100001; break;
      case  7000: PORTB=0b00010010; break;
      case  8000: PORTB=0b00001100; break;
      case  9000: PORTB=0b00010010; break;
      case 10000: PORTB=0b00100001; break;
      case 11000: i=-100;           break;
      default:   break;
    } 
    
}