5V on io3.in

[Dizzwold]

Hi Guys,

While I'm in the process of building a frame for all my electronics I'm looking at PS_ON.

I have the Duet 3 6HC and I'm planning on using the following wiring, but -;
https://forum.duet3d.com/assets/uploads/files/1578482787994-duet-ps_on-wiring.jpg

-where the switch is in the diagram, I'm going to have a 5 v relay controlled by a switch. A bit of a queer setup I know, having a relay control a relay.
Now on-top of that, I'd like to use DHusolo's trigger script/code for short press to power On, long press to power Off;
https://github.com/armysolo/Duet-PS_ON/blob/main/README.md
AS the switch I'l be using is 5v, controlling the 5v relay, can I input this same 5v into io3.in as the trigger rather than the usual gnd / ioX.in?

Now your asking why am I doing this when I could have an external 5v powering the duet and simply have ioX.in / gnd connected to a switch with the trigger script/code.

I don't want the Paneldue being on until the 24v side of the system in on. I only want the 5v & 12v PSU running all the time for lighting, then when I press the switch everything then switches on.
I appreciate I've created lots of extra work in doing this, but due to the physical positioning of the electronics, printer and personal situation I also don't wish to have a 240v switch as in the original wiring diagram above.

So basically can I safely short the 5v pin to ioX.in for these few seconds?

[dc42]

@Dizzwold yes it's safe t connect IO_IN pins to 5V. On Duet 3 they are rated at 30V or 50V depending on the board version. Make sure that the negative side of the 5V supply is connected to negative VIN.