Maximum Number of Zones

[HereComesTheRain]

You can use jumper wires.

Thanks.

This will confirm my NOOBness.

The BREADBOARD has 63 rows and 10 columns along with 2 positive and 2 negative columns and a center divide.

Am I correct to assume that the insertion points are connected by rows in groups of 5. For example 1A, 1B, 1C, 1D, 1E are connected within the BREADBOARD.

So then does that mean I just need to jump wires from the additional 74HC595 Shift Registers to corresponding open insertion points at the first 74HC595 Shift Register which is attached to the Raspberry Pi and that this can be done by daisy chaining?

With regards to powering the setup.  I have three power supplies: Pi power supply, Relay Board(s) power supply and an Irrigation Valve power supply.

I am unclear if I can replace the Pi power input to the BREADBOARD with input from the Relay Board power supply or if that would cause and issue or catastrophic failure.

Thanks again for all your help.