mcbeen.com

After speaking with BTT, I confirmed that PS-ON(PD14) pin needs to be brought high on power on. This needs to happen before the RPI boots. So I recompiled the main MCU firmware to include this change, and flashed it. I’ll need to retune klipper next so I can make sure the printer cleanly shuts down when triggered.

Additionally, I have wired the E-Stop into pin (!)PF2. This is normally used for the Z endstop (motor 3) but I’m using a virtual endstop through TAP. When pressed the printer executes:

    {action_emergency_stop("Emergency Stop Triggered. Shutting down!")}

I’m still working out how best to cleanly shut down the rpi. I’m kind of surprised this isn’t already built in. Here are my power macros

[gcode_button ESTOP_BUTTON]
pin: !M3_z_diag
press_gcode:  
    {action_emergency_stop("Emergency Stop Triggered. Shutting down!")}

[gcode_macro POWER_ON]
description: Turn on the printer via the relay
gcode: 
    { action_respond_info('Switching Relay ON') }
    SET_PIN PIN=power VALUE=1

[gcode_macro POWER_OFF]
description: Turn off the printer via the relay
gcode:
    { action_respond_info('Switching Relay OFF') }
    SET_PIN PIN=power VALUE=0

[delayed_gcode shutdown_machine]
gcode:
     POWER_OFF
     {action_call_remote_method("shutdown_machine")}
     initial_duration: 0.0

Then Run

UPDATE_DELAYED_GCODE ID=shutdown_machine DURATION=1

When I want to power off the printer. Initial tests have gone well.

This requires the installation of a community module “G-Code Shell Command” through KIAUH