This is my first post. So. Great Project at all! Thank you Ray.
I plan to use only expansion board with Raspberry PI!
But didn’t find what elements to use for TVS1-TVS16 based on this schematic : https://github.com/rayshobby/opensprinkler/blob/master/Expansion%20Board/exp20.png
I’m from Bulgaria, so I can order elements from Farnell.
I plan to use only expansion board, because its simple and minimum hardware to do the job. I don’t need power module, RTC, relay and A/D converter.
And one more question.
Based on OSPI v1.4 board, in my setup (RPI + Exp Board 2.0) , I need to connect one of the lines of 24VAC to GND to work? I hope this will not affect the RPI.