https://github.com/bigtreetech/BIGTREETECH-Relay-V1.2/blob/master/BIGTREETECH%20Relay%20V1.2/BIGTREETECH%20Relay%20V1.2/Hardware/%E5%BC%80%E5%85%B3%E5%8A%A0%E6%89%93%E5%AE%8C%E5%85%B3%E6%9C%BA.jpg

I know thats for a different MCU, but it should give you an idea on how to wire it correctly to function properly. Only other thing you could try is to try ^PC3 and see if that helps.

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I have the same problem with my printer. The pin is configured as:

[output_pin PS_ON_OFF]
pin: PC3
value: 1

My print end code is:

[gcode_macro END_PRINT]
gcode:
    # Turn off bed, extruder, and fan
    M140 S0
    M104 S0
    M106 S0
    # Move nozzle away from print while retracting
    G91
    G1 X-2 Y-2 E-3 F300
    # Raise nozzle by 10mm
    G1 Z10 F3000
    G90
    G1 X10 Y330 F1000
    # Disable steppers
    M84
    G90 ; absolute positioning
    TEMPERATURE_WAIT sensor=extruder maximum=60
    SET_PIN PIN=PS_ON_OFF VALUE=0; shut down the printer

The board boots too slow for the 15 second time delay of the relay board. I have tested the relays actions for the end of print and it works as predicted. I need to know if there is a way to make PC3 go high before Klipper loads or is there a way to lengthen the 15 second delay on the relay board?

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When building the firmware if you set pin pc3 high on startup it will fix the issues with the relay board

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I tried to enter this in menuconfig : set_digital_out pin=PC3 value=1

When I ran make I had the following error: Unknown initial pin set_digital_out pin=PC3 value=1

Is there a different pin callout on the microprocessor level?

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Just put the pin. Pc3 nothing else

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Hy everybody
i switched my motherboard for a M4P and this setup work perfectly
[output_pin ps_on_pin]
pin: PD1

The pin to configure as an output. This parameter must be

provided.

#pwm: False

Set if the output pin should be capable of pulse-width-modulation.

If this is true, the value fields should be between 0 and 1; if it

is false the value fields should be either 0 or 1. The default is

False.

#static_value:

If this is set, then the pin is assigned to this value at startup

and the pin can not be changed during runtime. A static pin uses

slightly less ram in the micro-controller. The default is to use

runtime configuration of pins.

value:1

The value to initially set the pin to during MCU configuration.

The default is 0 (for low voltage).

shutdown_value : 1

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Just put the pin. Pc3 nothing else
As in attached picture? No need to mention "high" or any other comment?

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