int _led_gruenF = 6;
int _taster_T = 2;
int _led_gelbA = 10;
int _led_rotF = 7;
int _led_gruenA = 9;
int _led_rotA = 11;
void setup()
{
    pinMode(_led_gruenF, OUTPUT);
    pinMode(_taster_T, INPUT);
    pinMode(_led_gelbA, OUTPUT);
    pinMode(_led_rotF, OUTPUT);
    pinMode(_led_gruenA, OUTPUT);
    pinMode(_led_rotA, OUTPUT);
}

void loop()
{
    if ( digitalRead(_taster_T) ) {
        digitalWrite(_led_rotA, LOW);
        digitalWrite(_led_rotF, LOW);
        digitalWrite(_led_gruenA, LOW);
        digitalWrite(_led_gruenF, LOW);
        digitalWrite(_led_gelbA, LOW);
        delay(500);
        digitalWrite(_led_gelbA, HIGH);
        delay(500);
    } else {
        digitalWrite(_led_rotA, HIGH);
        digitalWrite(_led_gruenF, HIGH);
        delay(3000);
        digitalWrite(_led_gruenF, LOW);
        digitalWrite(_led_rotF, HIGH);
        digitalWrite(_led_gelbA, HIGH);
        delay(1000);
        digitalWrite(_led_rotA, LOW);
        digitalWrite(_led_gelbA, LOW);
        digitalWrite(_led_gruenA, HIGH);
        delay(3000);
        digitalWrite(_led_gruenA, LOW);
        digitalWrite(_led_gelbA, HIGH);
        delay(1000);
        digitalWrite(_led_gelbA, LOW);
        digitalWrite(_led_rotF, LOW);
    }
}