We figured that the circuit we build yesterday was designed for a DC-motor, and not for a stepper motor which we wanted to use. But we found a new circuit; http://arduino.cc/en/Reference/StepperBipolarCircuit with the H-bridge "SN754410NE". We managed to get it to work with one stepper motor and will try to run it with two motors at the same time.
Ubuntu was installed on the laptop we borrowed.
We decided to discard the idea with motion sensors to detect people since the ones we tried was to sensitive and had a delay of 30 seconds. Instead we are going to use the webcam and proximity sensors to detect obstacles and people.
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