There is no way to control directly a Standart Relay on SKR 1.3. After nearly 10 hours of search / read & try. I figured out something else. You can control Relay on Servo pins. But you need to modify your marlin firmware as well.

What you need

SKR v1.3

Marlin BugFix 2.0.X

2/3 way Switch 220V/5A

Relay Module 220V/5A

Wire

[pins_BIGTREE_SKR_V1.3.h] \src\pins

//#define SERVO0_PIN P2_00 Servo pin are not defined

[M42.cpp] \src\gcode\control

if (pin_status==0){ //****M42 P200 S0 change the pinmode to input (Relay will be off)

extDigitalWrite(pin, 0);

analogWrite(pin, 0);

pinMode(pin, INPUT);

}else{

pinMode(pin, OUTPUT);

extDigitalWrite(pin, pin_status);

analogWrite(pin, pin_status);

}

I usually don’t leave my printer unattended and I don’t always want to "turn off automatically". However some print take too long.

I have a script “turn it on & turn it off”. When I need them, I simply add them to my gcode (at start and end).

;Relay turn on // start of GCode

M42 P200 S255 ;power/turn on relay

M300 S500 P500 ;sound

;Relay turn off // end of GCode

M300 S1000 P3000 ;sound

G34 S200 ;wait 200 seconds

M42 P200 S0 ;power/turn off relay

PS: Power switch and relay are connected each other (technically they are parallel) When the Relay is turned on, you can turn off the pwoer switch. Your printer will not turn off, until the end script.

I worked really hard & If you think this is cool, please consider to paypal.me/omete

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