Problem with 2nd register heating

[annujbhatia]

Re: Irrigation Controller (up to 16 valves with Shift Registers)
Hi, my module works with 8 relays but when i try to expand to 16 relays i have an issue. The 2nd register heats up and the pro mini keep restarting / re-initializing. I think i have the wrong connections for the 2nd register. Can anyone help / share what the wiring for the 2nd register should be?

[rzylius]

@annujbhatia , did you manage to connect it right? I have the same challenge as I have 9 zones.

https://www.arduino.cc/en/Tutorial/ShiftOut should be the guidance I suppose