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+====== WIOPi_01 Wireless drive on base of Raspberry Zero. ======
+[[english|{{  rocrail-logo-35.png}}]]
+  * [[:hardware-en|GCA Hardware]]
+    * [[:hardware-en#wio|GCA WIO]]
+    * [[:wio:firststeps-en|WIO First steps]]
+    * [[:wio:wiopi-en|WIOpi Software & Documentation]]
+ \\
+^Copyright Rob Versluis and Peter Giling^
+\\
+|  {{:gca:wiopi_01_pict03.jpg?400}}  |  {{:gca:wiopi_01_pict04.jpg?355}}  |  {{:gca:wiopi-01_pcb.jpg?250|}}  |
+|  The base pcboard only  |  The total unit with Raspberry Zero on top  |  The professional pcb  |
+\\
+====== Description ======
+The total WIO idea has been spread out so far into a nice assortiment of  modules.\\
+But hat was all based on the Arduino family.\\
+The new development of he Raspberry Zero, proves, that other producers can do the same\\
+This unit uses the Raspberry Pi Zero as base, which makes it very compatible with the Arduino boards.\\
+The unit was in principle developed to be used in G-track locs.\\
+But doing that there is one thing that should be different.\\
+The Zero takes a few seconds to start up, and a not very solid contact from the rails would cause\\
+the loc to stop for a few seconds.\\
+To avoid that , and also to avoid needing to really seriously clean the rails before we can play outside.\\
+the decision was made to use a chargeable battery inside the loc\\
+But a loc needs more than just motordrive.\\
+The WIOPi-0 has several other controls on board.\\
+This unit is one of the first that also needs SMD components.\\
+WE tried to avoid that as much as possible, but speceially the A/D converter is \\
+no longer in the market in DIL-16, so there was no choice at all.\\
+But this type SO-16 is rather easy to solder with a steady hand and a good quality soldertool.\\
+====== Features ======
+   * Control output for 2 servo's, where doors or pantographs can be put in motion.
+   * Of course output for front and backlights. (led output as standard, but applicable for other items)
+   * I2C to connect various other options, even a display
+   * 2 analog inputs for measuring anything that would be interesting.
+   * RocNet driver on board.
+   * Serial port to connect an RFID unit like ID12LA. This will abort the need of feed-back contacts and a lot of wiring for that.
+   * On board H-bridge L6203 for driving motors.
+====== Hardware files ======
+|  {{ :gca:wiopi-01_sch.pdf |The schematics}}  |
+|  {{:gca:wiopi-01_pcb.pdf|The pcb with parts positions}}  |
+|  {{:gca:wiopi-01_parts.pdf|The bill of materials}}  |