@nhorvath wrote:
I developed my own relay board for the raspberry pi because I had 9 zones and didn’t want to have to use an opensprinklerpi + expansion just for the one extra zone. I posted the design on github in case anyone else wanted to use it: https://github.com/nhorvath/sprinklers_pi/tree/master/hardware/Sprinkler%20Controller
Nice design. Thanks for sharing. You may want to make this a separate post to get it more noticeable, or post it under the Hardware section.