GYRO30: This sensor will help your robot to a certain number of degrees. We wan to turn 90 degrees, but do to real world factors we need to use a different number. -81 worked for my robot, What number will work the best for you?What number will you need to change to make a bigger square? We also are learning about the "repeat until" it will keep doing something until it mets the number we have set. in these case it will stop turning when the gyro number is less than -81.