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+====== GCA189 Magnet activated rail selector ======
+[[english|{{  rocrail-logo-35.png}}]]
+[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#interfaces|GCA]]
+ \\
+^^^^By Peter Giling ^^^^
+===== Description =====
+Using sliding contacts have some negative results.\\
+Most of all , in my experience, these contatcs are not full 100% reliable, which I do not like specially when I am showing a fiddle yard in public.\\
+So a better solution was to be developed, and that better solution is coming in here.\\
+A hallsensor like TLE4905 is capable of a maximum switch load of 100 mA at a maximum of 18 Volts.\\
+So a relay like OmronG2R 12V , needing approx 50 mA is fine to be switched directly with it\\
+The idea is to use this SPDT relay on each track-section and activate it with a fixed magnet .\\
+In that case, there is zero friction, and the contact is 100% sure.\\
+So I need a board for that.\\
+I have 12 tracks on this Fiddle yard, so I need 12 relays in one line\\
+And since I have 3 contact sections in each rail, I need 3 of these lines, with a total of 36 relays.\\
+The easiest way to achieve that is to make a board with 4 relays, and fix 3 of them in a line.\\
+|  Fortunately I have these 36 second-hand relays.  |  {{:gca:omron_g2r.png?200}}  |
+|  In any other situation, a well known Siemens relay  with 3 or 4  \\  DPDT contacts will do also, to use one relay for the three sections together.  |  {{:gca:siemens_a3_relay.png?200}}  |
+\\
+|  This is my home made product.  |
+|  {{:gca:gca189-a_proto_2.png}}   |
+On the top edge, 4 hallsensors are visible, with a distance of 40mm from each other, matching the rail distance on the slider.\\
+The board is supplied by the rail power and a cheap 12 V regulator, and, for securety, also fused with 0,5A multifuse\\
+With each relay there is also a led for easy indication and check.\\
+Left and right are connectors for in/out of the railpower, and in the middle the connector for the 4 rail sections.\\
+The GCA145 controller signals on J5 Pin 10 when Fiddle yard is in position.\\
+The output is active when at 0V.\\
+This signal is also used to switch all railpower to the rails on the sledge, making it impossible for trains to run while the fiddle yard is moving.\\
+Relay board [[GCA189-b-en|GCA189-b]] is made to match perfectly this signal.\\
+The board is also has option to use it with positive signals.\\
+=====to be continued............=====
+===== The hardware files =====
+===== Connections =====
+{{:gca:schematic_for_connections_gca189.png?800}