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+====== GCA125 Interface for motordriven turnouts ======
+[[english|{{  rocrail-logo-35.png}}]]
+[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#interfaces|GCA]]
+  *  [[mgv-overview-en|The GCA modules]]
+ \\
+^^^^By Peter Giling ^^^^
+==== Features and facts ====
+individual inputs, commanding 8 individual outputs
+mA max load per output.
+Max 42 Volt per output.
+individual inputs.
+Time selection for output duration.
+Outputs are activated one by one for power reduction.
+===== The prototype =====
+{{:mgv:hardware:gca125_pict01_mk.jpg?600}}
+===== Description =====
+Controlling a LGB 1201, Kato or Fulgurex turnout-drive, in fact also some type of Hoffmann turnout motors, only have one coil or motor, that needs to be controlled by polarity.\\
+Even the Bohler WA2 is very nicely useable with this interface.\\
+The normal driver like GCA77 is not suitable for that.\\
+The complexity of this unit is slightly higher.\\
+In the GCA units, it is standard, to separate the power, needed to activate the coils and the LocoNet system by means of optocouplers.\\
+This unit is able to control 8 turnouts, and need 8 inputs from the GCA50.\\
+So 2 units, capable of a total of 16 turnouts, are commanded by 1 GCA50.\\
+It is also possible to use a switch for direct activation without GCA50. \\
+You will need a 5-12Vdc to activate the opto-couplers.\\
+The software in the PIC16F62x is made in such a way that the processor provides a correct timing for the coil, and switch it off after the chosen time.\\
+This will take care that the turnout coil will not be overheated by too long powering.\\
+The time selection is done with the Dipswitch.\\
+The processor in the circuit needs 8 inputs and 16 outputs, and 3 extra for dip-switch reading. \\
+The smaller PIC processors have only maximum 16 I/O.\\
+Therefore I used I2C expanders , making a small processor suitable.\\\\
+===== The hardware files =====
+|{{:mgv:hardware:mgv125-sch.pdf|The schematics}}   |
+|{{:mgv:hardware:mgv125-pcb.pdf|The pcb Layout}}   |
+^N.B. Self made pc-boards are not supported! ^
+===== Cable to MGV50 / CAN-GC2 =====
+refer to:
+[[PSK-Interface connections-en|**Connection interfaces**]]
+===== Firmware =====
+{{mgv:hardware:mgv125.zip|program files}}
+===== Time delay settings =====
+SW1 is used to set the delay time after which the output will be swotched off.
+^ Delay table  ^  ^  ^   ^
+|  Delay in Sec   |  SW1 1   | SW 2   |  SW 3   |
+|  0.1   |  Off   |   Off   |   Off   |
+|  0.2   |  Off   |   Off   |   On   |
+|  0.4   |  Off   |   On   |   Off   |
+|  0.8   |  Off   |   On   |   On   |
+|  1.6   |  On   |   Off   |   Off   |
+|  3.2   |  On   |   Off   |   On   |
+|  6.4   |  On   |   On   |   Off   |
+|  12.8   |  On   |   On   |   On   |
+===== Remarks =====
+Inputs, if activated, should remain activated, to keep motor/coil in the chosen position.
+GCA50 should be programmed as switch, with C2 NOT checked.
+Checking C2 will inverse action.
+===== Bill of materials =====
+^  Qty  ^  Reference  ^  Description  ^
+|  8  |  R1..8  |  1 kOhm  |
+|  2  |  R9,10  |  3.3 kOhm  |
+|  3  |  R11...13  |  10 kOhm  |
+|  1  |  RP1  |  8x 10 kOhm SIL-9  |
+|  1  |  C1  |  1000 uF 35V radial  |
+|  1  |  C2  |  10 uF 35V radial  |
+|  3  |  C3..5  |  capacitor 100 nF  |
+|  1  |  VR1  |  Power IC 7805 (TO-220)  |
+|  1  |  U1  |  Processor PIC16F627 or equiv.  |
+|  1  |      |  socket 18Pins for U1  |
+|  2  |  U2,U3  |  PCF8574  |
+|  4  |  U4..7  |  L293D (DIL-16)  |
+|  2  |  U8,9  |  LTV847 or equiv.  |
+|  8  |    |  Socket Dil16  |
+|  1  |  GR1  |  Bridge B80C1500 round  |
+|  1  |  F1  |  PFRA110  mulitfuse 1.1A  |
+|  4  |  J1  |   AKL012-04  |
+|  1  |  J2  |  AKL012-02  |
+|  1  |  SW1  |  dip-switch 3  |