#define segA PB0
#define segB PB1
#define segC PB2
#define segD PB3
#define segE PB4
#define segF PB5
#define segG PB6
#define segDP PB7
#define DIG1 PC13
#define DIG2 PC14
int i=0;

void setup() {
  pinMode(segA, OUTPUT);
  pinMode(segB, OUTPUT);
  pinMode(segC, OUTPUT);
  pinMode(segD, OUTPUT);
  pinMode(segE, OUTPUT);
  pinMode(segF, OUTPUT);
  pinMode(segG, OUTPUT);
  pinMode(segDP, OUTPUT);
  pinMode(DIG1, OUTPUT);
  pinMode(DIG2, OUTPUT);
}


void loop() {

  switch(i){

    case 0:  
      digitalWrite(DIG2, HIGH); //Ziffer 2 aus
      digitalWrite(segA, LOW);
      digitalWrite(segB, HIGH);
      digitalWrite(segC, HIGH);
      digitalWrite(segD, LOW);
      digitalWrite(segE, LOW);
      digitalWrite(segF, LOW);
      digitalWrite(segG, LOW);
      digitalWrite(segDP, LOW);
      digitalWrite(DIG1, LOW);  //Ziffer 1 an
      i++;
      delay(50);
      break;

    case 1:
      digitalWrite(DIG1, HIGH);   //Ziffer 1 aus
      digitalWrite(segA, HIGH);
      digitalWrite(segB, HIGH);
      digitalWrite(segC, HIGH);
      digitalWrite(segD, HIGH);
      digitalWrite(segE, HIGH);
      digitalWrite(segF, HIGH);
      digitalWrite(segG, LOW);
      digitalWrite(segDP, LOW);
      digitalWrite(DIG2, LOW);    //Ziffer 2 an
      delay(50);
      i=0;
      break;
    
  }
}