raschemmel:
Take a photo of the pullup resistor for the sensor showing it connected to the +5V rail and post the photo.
Look at the schematic . The pullup resistor is supposed to be connected to +5V, not GND.
Are you sure it is the correct value resistor ?
Yes, thank you very much for your help. Apparently like you told the polarity of the phototransistor is usual backward and the resistor and the analog read should be connected to the longer lead. I read some more in internet and found some other help aswel. The given image is one of that.
But now i have another problem, I cant connect more than 3 sensors to analog inputs, it gives me the "avrdude: stk500_getsync(): not in sync: resp=0x00" and the 4th and 5th sensor does not ready any proper value.
I will probably post another thread about it.