The three Servo Motors give your robot the ability  
to move. If you use the Move block in the  
software to program your motors, the two motors 
will automatically synchronize, so that your robot 
will move in a straight line.
Select the Motor Rotations icon.
Select the port where you have  
connected the motor.
Now attach a wheel to the motor and measure the rotations as you roll the wheel along the oor.
Test the built-in Rotation Sensor’s ability to measure distance:
Connect a motor to the NXT.
Select the View submenu in the NXT’s display.
The built-in Rotation Sensor in each  
motor also lets you set different speeds 
for your motors (by setting different 
power parameters in the software). Try 
running the motors at different speeds.
Each motor has a built-in Rotation Sensor. This lets 
you control your robot’s movements precisely. The 
Rotation Sensor measures motor rotations in degrees 
or full rotations (accuracy of +/- one degree). 
One rotation is equal to 360 degrees, so if you set a 
motor to turn 180 degrees, its output shaft will make 
half a turn.
Select the Try Me submenu on the NXT’s display and test your 
motors. You’ll get a fun reaction.