Maximum Number of Zones

[HereComesTheRain]

It should be placed on the first hc595 at the connection point of the Pi. Even better is a 100ohm resistor in series. Something like this

Code:

Pi ---[ R100 ]---|-----> to hc595
                 = 0.1u
         |    
Gnd -------------------

Also, never connect wires or components while powered on. I assume you do know this but want to mention it anyway.

Without the right measuring equipment it is trial and error. You will get there I'm sure :-)

Just to clarify I have the 10k resistor installed.  I do not have the .1u installed.

With regards to .1u placement I was going by the diagram located here https://github.com/Dan-in-CA/sip/wiki/Relay-interface.  Also note the short blue jumper wires going to GND on the BOTTOM POWER RAIL.

I'm a NOOB in all caps but I'm cautious, I halt and power everything off before doing anything. I try to limit the potential for disaster whenever possible.  It would be nice to have a POWER OFF button under OPTIONS / System Restart. For me it would save a trek into the house to start an ssh session into the Pi to issue a shutdown now -P command.  (Dan are you listening?)

I have a multimeter would that be of any help?

"100ohm resistor in series" Would you break that down for me? I'm trying to figure out how/where it goes in relationship to the diagram located at https://github.com/Dan-in-CA/sip/wiki/Relay-interface.