Reply To: Need positive logic from the 74HC595 output

[Samer]

These are the two files which interface with the GPIO pins on the Raspberry Pi:

https://github.com/OpenSprinkler/OpenSprinkler-Firmware/blob/master/gpio.cpp#L107-127
https://github.com/OpenSprinkler/OpenSprinkler-Firmware/blob/master/gpio.ch#L30-33

That should help you get started modifying it to work with your hardware.