Display/Relógio Drogaderma

int a=2,b=3,c=4,d=5; int PIN28=6; int PIN29=7;

void setup(){

 pinMode(a, OUTPUT);
 pinMode(b, OUTPUT);
 pinMode(c, OUTPUT);
 pinMode(d, OUTPUT);
 pinMode(PIN28, OUTPUT);
 pinMode(PIN29, OUTPUT);

}

int line=0; int counter=0; void loop(){

 line=(line+1)%2;

 digitalWrite(PIN28, line==0 ? HIGH : LOW);
 digitalWrite(PIN29, line==1 ? HIGH : LOW);

 switch(line){
   case 0:
     digitalWrite(a, LOW);
     digitalWrite(b, HIGH);//c
     digitalWrite(c, LOW);
     digitalWrite(d, LOW);
     break;
   case 1:
     digitalWrite(a, LOW);
     digitalWrite(b, HIGH);
     digitalWrite(c, HIGH); //f
     digitalWrite(d, HIGH); //SAT
     break;
   default:
     break;
 }
 
 delay(10);

}