Differences

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--- projects:zturn-hackers:gpio-addon [2015/07/12 14:58] – created emeryth
+++ projects:zturn-hackers:gpio-addon [2015/12/17 20:03] (current) – emeryth
@@ Line 6: / Line 6: @@
 {{:projects:zturn-hackers:addon.jpg?200|}}
 {{:projects:zturn-hackers:zturn_with_addon.jpg?200|}}
+Project repo:
+[[https://code.hackerspace.pl/emeryth/zturn_addon/]]
+==== Details ====
+\\
+== 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.