byte zaehler = 0;
byte ergebnis = 0;

void setup() {
  // put your setup code here, to run once:
for (byte n = 8;n <= 11; n++)
pinMode(n, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int poti = analogRead(A5);
int zaeler = map(poti, 0, 1023, 0, 15);

for (byte n = 0; n <= 3; n++)
digitalWrite(n + 8, bitRead(zaeler, n));
delay(1000);
zaeler++;
}