Robot is driven by two wheels. Each wheel is connected to motor by gear. At the end of construcion we installed a skid, which allows a free non-interrupted movement. At front we installed a bumper connected to LEGO Touch sensor. Via this sensor the robot reacts on obstacle which is below the range of LEGO Ultrasonic Sensor. The LEGO Ultrasonic Sensor is mounted on the third motor and connected to Robocore. The motor sets sensor in the four position on the left direction and four in the right direction and one in forward. Moreover in each of position sensor makes five measurments and calculate a mean distance for each of position.