With Pi Rev B, you need to change one pin number in the Python scripts. This is explain in the README.txt of the demo folder. For example:
https://github.com/rayshobby/opensprinkler/blob/master/OpenSprinkler%20Pi/software/demos/manual_buttons/README.txt
But even without changing this, the self-test program should still work. Were you not able to get any output voltage even running the ospi_selftest?