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+====== GCA186-2 Railroad Crossing ======
+[[english|{{  rocrail-logo-35.png}}]]
+[[:english|Content]] -> [[:hardware-en|Hardware]] -> [[:hardware-en#interfaces|GCA]]
+  *  [[mgv-overview-en|The GCA modules]]
+ \\
+^^^^By Peter Giling ^^^^
+\\
+===== Description =====
+Making barriers moving is easy now adays with servo motors.\\
+But if we like to have this controlled the way it should, there is more needed than just the servo itself.\\
+In the real world, for example, there is a system that senses when the tail of a train just has passed the crossing area, or counting all the whees/axes before and after the crossing.\\
+That can be done in many ways, but it always come to the fact , that it does not matter if a train is 50 wagons long,\\
+or just a locomotive.\\
+One way to achieve that on our miniature world, is doing it completely manual.\\
+But that is not the way I would prefer, so I started making a solution for a friend in a different way.\\
+It starts with the idea that whether he is driving a train manually or automatic (with Rocrail of course !),\\
+this system should always work.\\
+GCA186-2 is meant to work totally independant from any other system.\\
+All we need is a 9-16V transformer or Adapter.\\
+Now the basic is to fix at least two magnets under the train, one in front, and one under the last waggon.\\
+More than two is no problem, the limit = 255.\\
+Next we need four hall sensors to be mounted between the sleepers, so that they will sense the magnets under the train. see [[http://wiki.rocrail.net/doku.php?id=gca173-en|GCA173]]\\
+**NOTE:**  For a one way traffic, only sensor A and C are needed!\\
+Be sure that the train should fit completely between sensor A and sensor C, and/or between point D and B.\\
+Many different options should be possible, depending on the software in this unit.\\
+That is made easy by using a medium scale micro processor.\\
+The example here is a 2 direction single track crossing.\\
+{{:gca:crossing_example.png|}}
+Assume that a train approaches from the left hand side.\\
+The train first activates sensor A.\\
+The GCA186-2 will start flashing the lights, switch on the relay which could possibly be used to activate any sound,\\
+and shortly after that the barriers descend.\\
+Board contains two outputs for servo's.\\
+In the mean time the train  continues, and the magnet under the last wagon also passes sensor A.\\
+Now, GCA186 has counted two magnets.\\
+Passing sensor B has no effect here.\\
+But as soon as the train passes point C, the count down starts.\\
+When the last wagon passes sensor C, two magnets have been counted, meaning that the rails are clear and\\
+the barriers should rise again etc.\\
+But that is not the complete end of it.\\
+To avoid that the systems starts again on passing point D,\\
+the train also has to count the magnets passing point D in the same amount as sensor A, before the whole system is reset.\\
+So far the flashing lights are still on, you should be familiar with the next expression: \\
+**PLEASE WAIT UNTIL FLASHING LIGHTS ARE OFF, ANOTHER TRAIN MIGHT BE APPROACHING !!**\\
+Flashes and sound will stop after the last sensor also has counted the correct amount of magnets.\\
+If you swap A with D and B with C in this text, you have the explanation for the opposite way.\\
+For a one way traffic, different firmware will be available, also for double track .\\
+This board cannot service more than doubletrack, nor can it service double track with each two direction driving.\\
+That would need many more sensors , which there is no input for.\\
+Contact [[peter.giling@rocrail.net|Peter]] if you need that.\\
+==== Feaures ====
+  *  control for two flashing leds, also possible on the barriers itself, because only 2 wires are needed
+  *  free relay contact available for sound options
+  *  two barriers each with its own motor, thus easy to install
+  *  high and low position of barriers are adjustable
+  *  Adjustable between starting flashing (and sound) and barriers to go down
+  *  Barriers will go up directly but ONLY after the last magnet has passed.\\
+This means that the length of the train is sensed.!
+\\
+===== The prototype board =====
+The usual item, to proove that it works, is not yet available\\
+|  {{:gca:gca186-2_pict01.png}}  |
+\\
+===== Hardware files =====
+|  {{:gca:gca186-2_sch.pdf|The schematics}}  |
+|  {{:gca:gca186-2_pcb.pdf|The pcboard and parts positions}}  |
+\\
+===== Firmware =====
+All firmware is developed with Picsimulator from Oshonsoft.\\
+| {{:gca:gca186-2_v3_singletrack_double_direction.zip|Firmware V3 for double direction on a single track}}  |