Kelevra86:
i want to drive my DC-Motor (via Arduino,Bluetooth<->Laptop) as long as i am pressing a button (W,S).
When i release the button it should stop. But the stored commands in my Bluetooth-Buffer are driving the motor again and again.
You're holding the key down on the PC and the key presses are being sent via BlueTooth to the Arduino? What application are you using on the PC to do that?