OK, I was hoping to use a regular relay board instead of the OSPi add-on (as I can’t get the OSPi add-on in South Africa). If the app uses a shift register, then I’ll have to just control the GPIO directly via some scripts rather than using the OpenSprinkler software. Great job in designing such an awesome tool, but in my case I’ll have to find another way. Thanks for replying on this forum so rapidly !