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There are a few different but related problems here. Position Your robot should be able to know where it is in the room. This can be achieved in a few ways: Using the ultrasonic sensor as a sonar, rotating it around and storing the readouts, then calcualting based on the known map of the room (if the layout is fixed and known in advance). Tracking the ...


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As you suspected, you cannot use the Ultrasonic sensor without an "Intelligent Brick" (EV3 or NXT). MINDSTROMS would be a great way to automate your train if you are willing to make the investment. For more ideas on how to use LEGO MINDSTORMS with LEGO trains, check out Sioux.NET.



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