In my HEVO I have SSR installed and one works well but in my converted Artillery Genius I didn't wanted to mess with wires so I decided to use simple remote switch with small script to automatically turn off printer when temperature is below treshold.

I used Sonoff S26 switch with tasmota installed.

Then on raspebbery pi I have python script executed every 5 minutes by cron.

Script is here https://github.com/pmarkiewicz/duet-off
There is no config file to make this simple. Everything is in one script.

Conditions to disable printer are:

• active temperature set to -1
• printer is idle
• current temperature for heater with -1 is below 45 deg

To "install" run
crontab -e

and add line
5 * * * * /usr/bin/python3 /home/pi/duet-off.py

@Phaedrux done

I installed Duet 2 WiFi in Genius and I have a problem with original endstops.
Sometimes they works sometime not and motors are grinding belt.
Any one have any idea?

For now I'm using stall detection but I want to use original Z end stop instead of BLTouch and this is more dangerous to printer.

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Aug 11 2020 22:01:44 GMT+0200 (czas środkowoeuropejski letni)

; General preferences
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"Genius"                                 ; set printer name
;M918 P1 E4 F2000000                            ; configure direct-connect display

; Network
M552 S1                                        ; enable network
M586 P0 S1                                     ; enable HTTP
M586 P1 S0                                     ; disable FTP
M586 P2 S0                                     ; disable Telnet

; Drives
M569 P0 S0                                     ; physical drive 0 goes backwards
M569 P1 S1                                     ; physical drive 1 goes backwards
M569 P2 S0                                     ; physical drive 2 goes forwards
M569 P3 S0                                     ; physical drive 3 goes backwards
M569 P4 S0                                     ; physical drive 4 goes backwards
M584 X0 Y1 Z2:4 E3                             ; set drive mapping
M350 X32 Y32 Z16:16 E16 I1                     ; configure microstepping with interpolation
M92 X158.86 Y159.26 Z1600.00:1600.0 E445.0  ; set steps per mm
M566 X2000.00 Y1800.00 Z24.00 E240.00	    	; set maximum instantaneous speed changes (mm/min)
M203 X10000.00 Y10000.00 Z180.00 E220.00 			; set maximum speeds (mm/min)
;M203 X200.00 Y200.00 Z20.00 E40.00				; guide mm/s
M201 X500.00 Y400.00 Z100.00 E100.00		   ; set accelerations (mm/s^2)
M204 P1000.00 T2000.00							; from guide mm/s^2
M906 X1000 Y1200 Z1200:1200 E980 I30              ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                        ; Set idle timeout

; dual Z
M671 X-25:255 Y110:110 S2						; Z axis distance 280

; Axis Limits
M208 X0 Y0 Z0 S1                               ; set axis minima
M208 X228 Y231 Z255 S0                         ; set axis maxima

; Endstops
M574 X1 S3 ;P"!xstop"                            ; configure sensorless endstop for low end on X
M915 P0 S2										; sensorless sensitivity S param
M574 Y1 S3 ; P"!ystop"                            
M915 P1 S2										; sensorless sensitivity S param
;M574 Z1 S1 P"!zstop"                            ; configure active-high endstop for low end on Z via pin zstop
M591 D0 P1 C"^e0stop" S1						; filament runout sensor

; Z-Probe
;M574 Z1 S2                                   ; set endstops controlled by probe
;M558 P9 H5 F100 T6000                        ; set Z probe type to bltouch and the dive height + speeds 
;M558 P0 H5 F120 T6000                          ; disable Z probe but set dive height, probe speed and travel speed
M557 X30:225 Y5:190 S19                       ; define mesh grid
M558 P9 C"^zprobe.in" H5 F120 T3000  			; BLTouch connected to Z probe IN pin
M950 S0 C"exp.heater3" 							; create servo/gpio 0 on heater 3 pin on expansion connector

;************************
G31 P25 X28.2 Y-35.3 Z1.9464					; z-probe trigger

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00                               ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S80                                    ; set temperature limit for heater 0 to 80C
M308 S1 P"e0temp" Y"thermistor" T100000 B4092  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S275                                   ; set temperature limit for heater 1 to 275C

; Fans
M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1:0 T45                              ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500                           ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H1:0 T45                            ; set fan 2 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                               ; define tool 0
G10 P0 X0 Y0 Z0                                ; set tool 0 axis offsets
G10 P0 R0 S0                                   ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined
;PID
M307 H0 A446.1 C424.2 D2.6 S1.00 V24.3 B0
M307 H1 A733.4 C200.3 D5.2 S1.00 V24.3 B0

M302 S180 R20									; Allow extrusion starting from 120°C and retractions already from 110°C

M572 D0 S0.035									; pressure adv

; Miscellaneous
M575 P1 S1 B57600                              ; enable support for PanelDue
T0                                             ; select first tool
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0

@Veti Because they are not reliable, that's why I enabled stall detection.

Anyone have endstops working reliably with duet?

Here is my config (extruder is different)

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Aug 11 2020 22:01:44 GMT+0200 (czas środkowoeuropejski letni)

; General preferences
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"Genius"                                 ; set printer name
;M918 P1 E4 F2000000                            ; configure direct-connect display

; Network
M552 S1                                        ; enable network
M586 P0 S1                                     ; enable HTTP
M586 P1 S0                                     ; disable FTP
M586 P2 S0                                     ; disable Telnet

; Drives
M569 P0 S0                                     ; physical drive 0 goes backwards
M569 P1 S1                                     ; physical drive 1 goes backwards
M569 P2 S0                                     ; physical drive 2 goes forwards
M569 P3 S0                                     ; physical drive 3 goes backwards
M569 P4 S0                                     ; physical drive 4 goes backwards
M584 X0 Y1 Z2:4 E3                             ; set drive mapping
M350 X32 Y32 Z16:16 E16 I1                     ; configure microstepping with interpolation
M92 X158.86 Y159.26 Z1600.00:1600.0 E445.0  ; set steps per mm
M566 X2000.00 Y1800.00 Z24.00 E240.00	    	; set maximum instantaneous speed changes (mm/min)
M203 X10000.00 Y10000.00 Z180.00 E220.00 			; set maximum speeds (mm/min)
;M203 X200.00 Y200.00 Z20.00 E40.00				; guide mm/s
M201 X500.00 Y400.00 Z100.00 E100.00		   ; set accelerations (mm/s^2)
M204 P1000.00 T2000.00							; from guide mm/s^2
M906 X1000 Y1200 Z1200:1200 E980 I30              ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                        ; Set idle timeout

; dual Z
M671 X-25:255 Y110:110 S2						; Z axis distance 280

; Axis Limits
M208 X0 Y0 Z0 S1                               ; set axis minima
M208 X228 Y231 Z255 S0                         ; set axis maxima

; Endstops
M574 X1 S3 ;P"!xstop"                            ; configure sensorless endstop for low end on X
M915 P0 S2										; sensorless sensitivity S param
M574 Y1 S3 ; P"!ystop"                            
M915 P1 S2										; sensorless sensitivity S param
;M574 Z1 S1 P"!zstop"                            ; configure active-high endstop for low end on Z via pin zstop
M591 D0 P1 C"^e0stop" S1						; filament runout sensor

; Z-Probe
;M574 Z1 S2                                   ; set endstops controlled by probe
;M558 P9 H5 F100 T6000                        ; set Z probe type to bltouch and the dive height + speeds 
;M558 P0 H5 F120 T6000                          ; disable Z probe but set dive height, probe speed and travel speed
M557 X30:225 Y5:190 S19                       ; define mesh grid
M558 P9 C"^zprobe.in" H5 F120 T3000  			; BLTouch connected to Z probe IN pin
M950 S0 C"exp.heater3" 							; create servo/gpio 0 on heater 3 pin on expansion connector

;************************
G31 P25 X28.2 Y-35.3 Z1.9464					; z-probe trigger

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00                               ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S80                                    ; set temperature limit for heater 0 to 80C
M308 S1 P"e0temp" Y"thermistor" T100000 B4092  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S275                                   ; set temperature limit for heater 1 to 275C

; Fans
M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1:0 T45                              ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500                           ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H1:0 T45                            ; set fan 2 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                               ; define tool 0
G10 P0 X0 Y0 Z0                                ; set tool 0 axis offsets
G10 P0 R0 S0                                   ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined
;PID
M307 H0 A446.1 C424.2 D2.6 S1.00 V24.3 B0
M307 H1 A733.4 C200.3 D5.2 S1.00 V24.3 B0

M302 S180 R20									; Allow extrusion starting from 120°C and retractions already from 110°C

M572 D0 S0.035									; pressure adv

; Miscellaneous
M575 P1 S1 B57600                              ; enable support for PanelDue
T0                                             ; select first tool
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0

In my HEVO I have SSR installed and one works well but in my converted Artillery Genius I didn't wanted to mess with wires so I decided to use simple remote switch with small script to automatically turn off printer when temperature is below treshold.

I used Sonoff S26 switch with tasmota installed.

Then on raspebbery pi I have python script executed every 5 minutes by cron.

Script is here https://github.com/pmarkiewicz/duet-off
There is no config file to make this simple. Everything is in one script.

Conditions to disable printer are:

• active temperature set to -1
• printer is idle
• current temperature for heater with -1 is below 45 deg

To "install" run
crontab -e

and add line
5 * * * * /usr/bin/python3 /home/pi/duet-off.py