Three motors are defined, wheelL, wheelR and claw.

A group, wheels, is defined to group wheelL and wheelR :

  wheels.speed = 10;

is equivalent to

  wheelL.speed = 10 & wheelR.speed = 10; 

The attribute .speed allows you to set the current speed of the motor. This value is set between -100 and 100.

Motor position (in degrees) can be accessed using the .val attribute. This attribute is set to 0 when you turn the robot on.