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+====== WIO_01 Input/Output with WIFI communiction. ======
+[[english|{{  rocrail-logo-35.png}}]]
+ \\
+^Copyright Rob Versluis and Peter Giling^
+{{  :gca:wio_01_v2._pict3.jpg?200|}}
+\\
+===== Description =====
+Newer members of the Arduino supported family of units, this one specially made us curious.\\
+Development of sketches for this Wemos D1 or Lolin D1 was a challenge wich resulted in a very complete piece of software.\\
+A large memory capacity, and Configuration of the unit via Rocrail made it possible to create one sketch, covering all \\
+planned and/or required tasks.\\
+The unit enables a wide variety of connections, but through restrictions in  timing, , some functions have to be chosen for.:\\
+    * 32 x  Programmable input /output ports, which are always available.
+    * 2 x RFID sensors
+    * 4 x servo motors, where Rocrail provides a very easy adjusting options.
+    * 2 x I2C connectors, for example to connect displays.
+    * 128 2503 leds on one line
+    * supply power for I2C connections, selectable for 3.3 or 5 Volt
+    * BS1 connector for booster like ORD-3
+\\
+===== Switching Power supply =====
+More and more very nice power supplies are available, making the use of transformers 'out of date'.\\
+All systems on board work with 3.3 or 5 Volt.\\
+But making a 5 Volt power line, is not a good idea.\\
+The power loss in many occasions might come unacceptable for a certain task, like servo's.\\
+Therefore, this board is equipped with a switching regulator, and the power supply for this unit can be anything between 12 and 24 Volt dc or between 10 and 18 Volt ac.\\
+The total VA (Volt x Ampere) should be at least 20 VA.\\
+So also a normal train transformer is useful here.\\
+The switching regulator has a selection for the output voltage, which should be set to 5V.\\
+It can be done by the on-board trimmer, but I prefer to use the voltage selector on the bottom side of the regulator board.\\
+Taking off the trimmer totally, assures that no accidental voltage change can occur.\\
+This will be the way kits will be configured.\\
+The used processor here, Lolin D1 Mini, only provides a few I/O pins, so a combination of various functions \\
+is not always possible, since they work on  the same pin.\\
+But the configuration in Rocrail will provide a simple selection of the desired task.\\
+\\
+===== further info =====
+Since this board is using same firmware as other WIO related units, the complete concept\\
+is explained in one page.
+[[  https://wiki.rocrail.net/doku.php?id=arduino:wio-en  ]]
+===== Hardware =====
+|  {{ :gca:wio_01_sch.pdf |The schematics}}  |
+|  {{ :gca:wio_01_v2_pcb.pdf |The pcb with parts positions}}  |
+|  {{ :gca:wio_01_v2_parts.pdf |Bill of materials}}  |
+\\
+===== Hardware connections=====
+==== WIO_01 contains many connection options.====
+\\
+=== I/O 1  to I/O 4 ===
+^    Pin #  \\  Connector  ^  Function  \\  I/O1  ^  Function  \\  I/O2  ^  Function  \\  I/O3  ^  Function  \\  I/O4  ^
+|  1  |  +5V  |  +5V  |  +5V  |  +5V  |
+|  2  |  GND  |  GND  |  GND  |  GND  |
+|  3  |  port 1  |  port 9  |  port 17  |  port 25  |
+|  4  |  port 2  |  port 10  |  port 18  |  port 26  |
+|  5  |  port 3  |  port 11  |  port 19  |  port 27  |
+|  6  |  port 4  |  port 12  |  port 20  |  port 28  |
+|  7  |  port 5  |  port 13  |  port 21  |  port 29  |
+|  8  |  port 6  |  port 14  |  port 22  |  port 30  |
+|  9  |  port 7  |  port 15  |  port 23  |  port 31  |
+|  10   |  port 8  |  port 16  |  port 24  |  port 32  |
+\\
+=== Se1 - Se4 Servomotors ===
+^ Se1 to Se4  servomotor ^^^
+|PIN|Function|wire colour|
+| 1 | Pulse | or |
+| 2 | +5V | re |
+| 3 | GND | br |
+\\
+===I2C1 and I2C2===
+Both connectors are linked together all 4 pins.\\
+The power to these connectors can be selceted with between 5V and 3,3V by Jp1.\\
+See indication on pcboard.\\
+^  Pins  ^  function  \\  I2C1  ^  function  \\  I2C2  ^
+|  1  |  SDA  |  SDA  |
+|  2  |  SCL  |  SCL  |
+|  3  |  GND  |  GND  |
+|  4  |  5V / 3,3V  |  5V / 3,3V  |
+\\
+===RC1 Railcom===
+This is a standard serial connector, which can be used to connect variious units, as far as WIO support them.\\
+Examples are:\\
+    * GCA214 Railcom unit (under development)
+    *
+^  Pinsetting RC1  ^
+^  pin #  ^  function  ^
+|  1  |  + 5V  |
+|  2  |  GND  |
+|  3  |  txd  |
+|  4  |  rxd  |
+\\
+===BS1  booster connector===
+This connection was planned to use for connection booster, long before WIOCtrl was developed.\\
+BS1 is still useable to drive a universal booster like ORD-3 or ORD-VC-1.\\
+^ Pin #  ^  function  ^
+|  1  |  DCC line 1  |
+|  2  |  DCC line 2  |
+|  3  |  GND  |
+|  4  |  Short circuit  |
+|  5  |  current sensor  |
+\\
+===FL1 Fastled===
+To connect a chain of 2812 Leds, (max 128).\\
+The limit is absolute 128, but with all leds full on, the power supply is by far not sufficient.\\
+In that case, external 5V supply should be used to connect to the led chain.\\
+^  Pinsetting FL1  ^^
+^  PIN #  ^  Function  ^
+|  1  |  Signal  |
+|  2  |  +5V  |
+|  3  |  GND  |
+\\
+===RC522-1 and RC522-2 RFID sensors===
+For use with RC522 sensors.\\
+The pins are one to one identical with the RC522 sensors.\\
+PIN5 and PIN7 does have to be wired, but wiring will do no harm.\\
+More about the RC522 RFID sensor can be found here:\\
+[[https://wiki.rocrail.net/doku.php?id=rc522-sensor-board-en#rc522_to_gca41_or_gca51]]