int zaehler = 0;
int Taster=A3;
int Tasterdown=A2;
int sei = 0;
int sei2 =0;

void setup(){
pinMode (Taster, INPUT_PULLUP);
pinMode (Tasterdown, INPUT_PULLUP);
}

void loop(){


if (digitalRead(A3) == LOW && sei == 0 && zaehler < 5)
{zaehler++;}

if (digitalRead(A3) == HIGH && sei == 1){
delay(250);
sei=0;}

if (digitalRead(A2) == LOW && sei2 == 0 && zaehler > 0)
{zaehler--;}

if (digitalRead(A2) == HIGH && sei2 == 1){
delay(250);
sei2=0;}

Serial.println( zaehler );
delay(500);

  }