====== Z-Turn GPIO add-on ======

This board brings out the GPIO pins found on the CN2 connector and routes them through 74LVCH245 buffers out to normally-sized pin headers.

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Project repo:
[[https://code.hackerspace.pl/emeryth/zturn_addon/]]

==== Details ====

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== Schematic ==

[[https://code.hackerspace.pl/emeryth/zturn_addon/plain/zturn_addon.pdf]]


== Power ==

The board features two ways of powering the buffers, selectable by J1 jumper pins:

  * EXT 3.3V - uses the 1117 linear regulator on the PCB, which is connected to the Z-turn's 5V supply
  * INT 3.3V - uses 3.3V supplied by the Z-turn board

Of course you can connect your own supply to one of the VCC pins if you want to (after removing the jumper).

== I/O Pins ==

The board features five 8-bit bi-directinal buffers - [[http://www.nxp.com/documents/data_sheet/74LVC_LVCH245A.pdf|74LVCH245]].
The direction can be set individually for each buffer.