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5

To get the actual time of day, you can use the mindsensors.com Realtime Clock Sensor.


3

I think I'd use the ultrasound sensor instead of the touch sensor (or the brightness sensor with the light turned on in a dark tunnel). I haven't tried this but I'd worry about the touch sensor derailing or scratching the train. Otherwse, your system sounds pretty doable. The collision risk could be addressed by setting up the sensor a little further before ...


2

Time is thought of as a sensor value, measured in seconds. The Timer sensor can be used directly, as part of a Wait For block, as part of a Loop block.


2

Here's an idea for converting the movement of a moving train to rotational motion track side. This is shown in set 6991: The mechanism in this case is a tire hanging from a universal joint so that it engages the train without interfering too much: This core idea could be mechanically adapted for other purposes, such as the 180 degree rotation that you are ...


1

If I understand the problem correctly, you have a track, on which something is moving in a straight line. Then you want to have another, stationary object to rotate when the moving something has passed a certain point on the track, right? Like a semaphore transitioning to another state after a train has passed a switchpoint? If so, then the simplest solution ...


1

Lego NXT vacuum cleaner project included charging station http://www.plastibots.com/index.php/2010/11/13/pulito-featuring-dflex/


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