Maximum Number of Zones

[HereComesTheRain]

I would use the top power rails for 5V power and ground from the pi to power the shift registers.

The bottom rails could be used for the power to the relay boards.

You can connect a jumper between both ground rails.

Nothing seems to be happening when I do a RUN ONCE.  Have tried a RELAY on each of the modules.

How can I troubleshoot to track down the problem?

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Here is a picture of the RELAY MODULE that I am using.