To control the duet via PS-ON is nothing new.
link text
But to do this via a smart home actuator might be a more current option.

While searching for an actuator I came across the Shelly 2.5
I have chosen it because it brings its own web interface to control. And because it's not cloud bound by default.
There is no nead for a smart home server. So it's already a good option out of the box.

The goal was to be able to switch the printer in such a way that it cannot be accidentally switched off in the middle of printing. Also all loads should be switched off.
The result is the following schematic. (Only the relevant area)

The key is to switch the actuator parallel to the PS-ON relay output.
I use an industrial relay with several channels, this has the advantage that one can switch a separated feedback channel once the duet is booted.
Currently I have 3 channels in use. Power supply, feedback and the heating bed (220V).

The following setting must be made in the switching channel of the Shelly.

Set the button type to "Detached Switch".

Set an "Auto Off" timer for that channel.
With this setting the input switch (SW) can be queried separately.

With this wiring and setting the printer only can be switched off by G-Code.
Either out of the DWC or automatic at the end of printing.
Of course, it also works via a hard-wired kill or main switch.

When everything worked I have been thinking about how to make it more comfortable and to get acoustic feedback.
The drama began seting up a homeserver starting to build a node red dashboard....
To cut a long story short it ended with the integration of G-codes, video image and the activation/deactivation logic.
Still work in progress...
Demo Duet Remote.mp4

@kwad3d-0

@fcwilt is one of the experienced users who really knows this stuff and spends a lot of time helping. But to help he must first understand what the problem is.
I can not get such an attitude ...

Edit:
Yes and sometimes he is also very accurate about terms. But that is certainly not to bother...

@tecno
In the middle right is an arrow which leads to a submenu where you can select it

@joshuamensch
Your files are set up for heater 4, but the Bltouch is wired to heater 3?

@nikscha
Reduce the frequence for the ssr. (Q parameter for heater) I had the same problem.

Edit:
That is my setting
M950 H0 C"bedheat" T0 Q10

@PaulHew said in Maestro, RRF3 and BLTouch issues:

M950 S0 C"^zprobe.mod" ; create servo pin 0 for BLTouch

M558 P9 C"zprobe.in" H5 F120 T3000 ; BLTouch connected to Z probe IN pin, free up MOD pin
M950 S0 C"zprobe.mod" ; servo/gpio 0 is Z probe MOD pin

That should be the right code.

You can do that very easily in Prusaslicer.
https://help.prusa3d.com/en/article/insert-pause-or-custom-g-code-at-layer_120490

@printthatthing
Leave it as it is....
You can edit that later on in the config.g

M950 S0 C"duex.pwm5" ; create servo pin 0 for BLTouch
You have to change that to
M950 S0 C"!duex.pwm5"
or rename to
M950 S0 C"exp.heater7"

You will find the full list of heater pin names here
https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview#Section_Pin_names_for_Duet_2_WiFi_Ethernet

@singhm29
In M557 also a P parameter is available.
Witch in my opinion is the easier way to define the mesh grid.
So in you case M557 X5:600 Y47:603 P10:10 as a suggestion
The grid than will be calculated for 10x10 points and the machine will drive to the set limits.

That's a bug, I have already reported.
Let it set to the e1heat. You have to adjust that later on in the config.g

The probe section then should look like that

; Z-Probe
M558 P9 C"zprobe.in" H5 F120 T3000 ; BLTouch connected to Z probe IN pin, free up MOD pin
M950 S0 C"zprobe.mod" ; servo/gpio 0 is Z probe MOD pin

Configuration for Ender3
config.json

@RogerL
Please check the content of resume.g.

@droftarts
For push-pull M567 also is missing....

@Tinchus
I would suggest the following additions or changes:
In config.g

; ENDSTOPS
M574 X1 S1 P"!io8.in"
M574 Y1 S1 P"!io6.in"
M574 Z1 S2                         ; configure Z-probe endstop for low end on Z

; bltouch
M950 S0 C"io7.out"               ;change S2 to S0        
M558 P9 C"io7.in" H5 F100 T3000 R0.2
G31 X-7 Y37 Z3.73 P25 ; bltouch offsets
M557 X7:193 Y18:195 S26.5:29.5      ; define mesh grid

In deployprobe.g

M280 P0 S10               ;change P2 to P0 

In retractprobe.g

M280 P0 S90               ;change P2 to P0 

@TomasL
Depending on what is needed, the positive voltages can be used together.
But then also pay attention to the cable cross-section

@Triet

M80

See the sub note in M81

@Tinchus
Sounds plausible to me, BL-Touch does not like magnetic fields.

@Tinchus said in Bltouch not deploy sometines it does:

I had exactly the same issue, that was driving me crazy....
check the pin
"Try loosening or tightening the set screw slightly to adjust the trigger sensitivity."
The description how to set up the srew is in the manual
In the end a quarter turn had reliably solved the problem.

@Jeronimo88

I have noticed that the limits of the old and new files are different. In addition, the old homing script uses hard-coded limits and the new variables dependent on config.g.
So first check the correct values and adjust them for M208 in config.g

@droftarts said in How hard is setting up CAN connected boards?:

Click on the "Connecting WITHOUT Duet 3 Tool Distribution Board" tab.

Oh yes, the tabs....I sometimes overlook them. I'm probably not the only one....

@droftarts said in How hard is setting up CAN connected boards?:

The problem I have for documentation is that there is hundreds of variations of ways to connect multiple boards together

In my opinion, no diagram is needed for such complex wiring. Such machines are only built by experts.
The documentation with the new diagrams is the right way to go.
The section "Expansion board connections" definitely needs illustrations / images.
It's a pity that the illustrations of wiring the 1LC are no longer available. Dozuki
Among those who voted with easy are some who started with the old documentation .....;-)