Building Smart LEGO MINDSTORMS EV3 Robots

Steering left

The next MyBlock is fairly straightforward. It rotates the front wheels into the left position so that the Falcon will make a left turn.

Before the robot does anything, it needs to check the current position of the front wheels. Since cases in the full program can execute continuously for periods of time (for example, holding down the steering button on the remote to make a turn), the program needs to verify that the front wheels are not already in the left position. This makes sure that, after the wheels move into the left position, they stop and stay there. Otherwise, the steering will continue to turn left until it runs into a mechanical limit and locks up.

First, add a motor rotation block (Measure | Degrees, port A) and ...