- * This method allows you to set the speed of the motor(s). The range of speed
- * is from [-1, 1]. A negative speed changes the direction of the motors.
- *
- * @param speed
- * The speed of the motors that control the rollers. The range of
- * these motors go from [-1,1]. A negative speed changes the
- * direction of the motors.
+ * This method sets the voltage of the motor to output the ball. The voltage
+ * values are constants in Constants class