Title
----- 
Auto Reverse v1


Goal
----
If you have a piece of track which has a beginning and an end, then you need
a mechanism to automatically reverse the train when it reaches the end 
(or beginning) of the track.


Solution
--------
Put a light sensor at the beginning and the end of the track. When the train
is in front of the sensor the power to the track is set to 0 (no power) and 
the train stops. After a configurable delay, the power to the track is reversed 
and the train travels to the other side.


Bill Of Materials
-----------------
1x RCX
2x Light Brick
2x Light Sensor
1x Train Track Contacts
4x Electric Wire
.. Track Straight/Curved


Issues/suggestions
------------------
- The power to the track is retrieved from the power of the RCX. I don't know
how long you can run a train on the track before the power of the RCX is too
low it stops working. If you're lucky and you have a RCX 1.0 with an external
power supply, then you don't have this problem.
A better solution should be to connect a mini/micro motor to Output_C which 
controls a pole reverser which is connected between a speed regulator and the 
train track contacts.
- To avoid the train running of the track, you can add a train buffer at the 
beginning and end of the track. Or just add more track so the train won't 
run off ...




Stefan Sanders
StefanSanders@Wanadoo.nl