OpenSprinkler › Forums › OpenSprinkler Unified Firmware › Need positive logic from the 74HC595 output › Reply To: Need positive logic from the 74HC595 output May 9, 2016 at 3:06 pm #42382 DavidParticipant @mikek thank you! this is great an so easy there should be a command in build.sh to generate a OS with inverted outputs. like: ./build.sh ospi -i -> invert the shiftregister out and GPIOs