UPDATED CODE: 1030-Switches__NPIO_Relay_Board.hgx (9 KB)
Releay Board - Must be 5vdc version
Just a tiny side project from my pool controller, a 16 relay controller over a wired network via Home Genie.
This will allow the control of 16 relays from RPi or PC
Tested with RPi-1B, RPi-3B, RPi-4, and Windows 11 laptop
Have fun
Another nice project 
You have just helped me solve a problem I have had to be able to remotely switch antennas to my ham radio station.
Thank you.
It’s always worth looking at these projects closely. So much of the code is reusable. It used to be like that in the old forum. These contributions are priceless. All the heavy lifting is already done for you.