#include <Ticker.h>

int counter = 0;
int SER = 2; 
int Clock = 3;
int RCK = 4;

int zahlen[10][8] = 
{{1,1,1,1,1,1,0,0},
{0,1,1,0,0,0,0,0},
{1,1,0,1,1,0,1,0},
{1,1,1,1,0,0,1,0},
{0,1,1,0,0,1,1,0},
{1,0,1,1,0,1,1,0},
{1,0,1,1,1,1,1,0},
{1,1,1,0,0,0,0,0},
{1,1,1,1,1,1,1,0},
{1,1,1,1,0,1,1,0}
};


void zahlSchreiben ()
{
  digitalWrite(RCK, LOW);
  
  for (int i = 0; i<=8; i++)
  {
    digitalWrite(Clock, LOW);
    digitalWrite(SER, !zahlen[counter][8-i]);
    digitalWrite(Clock, HIGH);
  }
  digitalWrite(RCK, HIGH);
  counter ++;
  if (counter > 9)
  {
    counter = 0;
  }
}

Ticker ticker(zahlSchreiben,500);

void setup() 
{
  ticker.start();
  Serial.begin(9600);

  pinMode(SER, OUTPUT);
  pinMode(Clock, OUTPUT);  
  pinMode(RCK, OUTPUT);
}

void loop() 
{
  ticker.update();
}