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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.

Project repo:



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 - 74LVCH245. The direction can be set individually for each buffer.

projects/zturn-hackers/gpio-addon.txt · Last modified: 2015/12/17 20:03 by emeryth

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