int btn = 12;

int l1 = 15;
int l2 = 2;
int l3 = 0;
int l4 = 4;
int l5 = 16;
int l6 = 17;
int l7 = 5;

int zzahl = 0;
int counter = 0;

void setup() {
  Serial.begin(115200);
    pinMode(btn, INPUT);
    pinMode(l1, OUTPUT);
    pinMode(l2, OUTPUT);
    pinMode(l3, OUTPUT);
    pinMode(l4, OUTPUT);
    pinMode(l5, OUTPUT);
    pinMode(l6, OUTPUT);
    pinMode(l7, OUTPUT);

//alle leds ausschalten
off();
}

void loop() {
  if(digitalRead(btn)==HIGH){
    while(counter <= random(1,50)){
    zzahl = random(1,7);
    Serial.print(zzahl);
   
    if(zzahl==1){on1();}
    else if(zzahl==2){on2();}
    else if(zzahl==3){on3();}
    else if(zzahl==4){on4();}
    else if(zzahl==5){on5();}
    else{on6();}
    delay(100);
    counter++;
    }
    delay(1000);
    Serial.println(" ");
  }
  counter = 0;
}

void off(){
  digitalWrite(l1, LOW);
  digitalWrite(l2, LOW);
  digitalWrite(l3, LOW);
  digitalWrite(l4, LOW);
  digitalWrite(l5, LOW);
  digitalWrite(l6, LOW);
  digitalWrite(l7, LOW);
}
void on1(){
  digitalWrite(l1, LOW);
  digitalWrite(l2, LOW);
  digitalWrite(l3, LOW);
  digitalWrite(l4, HIGH);
  digitalWrite(l5, LOW);
  digitalWrite(l6, LOW);
  digitalWrite(l7, LOW);
}
void on2(){
  digitalWrite(l1, HIGH);
  digitalWrite(l2, LOW);
  digitalWrite(l3, LOW);
  digitalWrite(l4, LOW);
  digitalWrite(l5, LOW);
  digitalWrite(l6, LOW);
  digitalWrite(l7, HIGH);
}
void on3(){
  digitalWrite(l1, HIGH);
  digitalWrite(l2, LOW);
  digitalWrite(l3, LOW);
  digitalWrite(l4, HIGH);
  digitalWrite(l5, LOW);
  digitalWrite(l6, LOW);
  digitalWrite(l7, HIGH);
}
void on4(){
  digitalWrite(l1, HIGH);
  digitalWrite(l2, LOW);
  digitalWrite(l3, HIGH);
  digitalWrite(l4, LOW);
  digitalWrite(l5, HIGH);
  digitalWrite(l6, LOW);
  digitalWrite(l7, HIGH);
}
void on5(){
  digitalWrite(l1, HIGH);
  digitalWrite(l2, LOW);
  digitalWrite(l3, HIGH);
  digitalWrite(l4, HIGH);
  digitalWrite(l5, HIGH);
  digitalWrite(l6, LOW);
  digitalWrite(l7, HIGH);
}
void on6(){
  digitalWrite(l1, HIGH);
  digitalWrite(l2, HIGH);
  digitalWrite(l3, HIGH);
  digitalWrite(l4, LOW);
  digitalWrite(l5, HIGH);
  digitalWrite(l6, HIGH);
  digitalWrite(l7, HIGH);
}