Physical buttons to 7i96s+7i77

..in connection with the machine retrofit #338210
, I would like to include the hardware buttons in the configuration, also calculating the mpg. I have a lot of free inputs (all on 7i96s) and about twenty on 7i77 where I left the first three free as I understood that they are analog because of the potentiometer) now I need a suggestion, since dont have schematic for the old controller and not for the buttons, I think they are all on 24vdc including mpg. the outputs that I connected to 7i77 lit the bulbs of these buttons at 24v. should I try the configuration in terms of the mpg pendant for selector increments and mpg, and for spindle and feed override how should I connect? Thanks

Wiring the buttons, switches, dials, etc.to the Mesa is the easy part.

Configuring LinuxCNC to interpret the signals is the hard part.

Start with the simple buttons and switches (and E-Stop); then worry about the dials, which are more complicated.

What version of LinuxCNC are you using?

Why do you need a 7i96s and a 7i77?

Wouldn't just one suffice?

The 7i77 has 48 I/O ports, which should be more than enough.

How does the 7i77 connect to the PC?

2.9.0. I didn't have a 7i92 with me, so I used a 7i96s as the main card, which turned out to be better because I'm planning two additional axes later that will use steppers...now about mpg, maybe and I have an example to try...but I didn't have any experience with connecting potentiometers for feed and spindle override, and any Hal example would be valuable to me.

If you search the forum for "MPG" you will find a number of examples

The 7I77 has 2 MPG inputs (4 pins) and the 7I96S has 4 MPG inputs (8 pins)
Either will work wit 5V to 24V signals

yes, I knew about the 7i96s, yes, I had connected two independent ones when I had a lathe that worked in sync... here I will find an example for one via the axix selector,as a pendant I think it's not a problem. My problem is that I don't know how to connect potentiometers in the hall (if the first three inputs in mode 3 are analog on the 7i77?) how can they recognize it in the hall as spindle override and feed override?

I think the tricky part  with feed override and spindle speed override
is to get along with the GUI