bigtreetech / bigtreetech/CB1

Printer with BTT Relay V1.2 shuts down power mid print

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Description

Hardware:
BTT SKR mini E3 V3
BTT Relay V1.2
BTT Pi V1.2

I have used the same hardware and configuration profiles with V2.3.4 Debian11 and with V3 Debian12 with no issues. The power relay performed as expected. After upgrading to V3.1 Debian13 with the same configurations the printer powers off mid print. I tried 2 different gcode models with the same results. I reloaded V3 Debian12 and printed both models without any issues. It appears V3.1 is falsely triggering the power relay. I am using pin PC13 on the SKR board to trigger the relay. Here is the macro defining the pin.

[output_pin power_detect]
# Pull the pin initially high after starting Klipper
pin: PC13
value: 1
shutdown_value: 0

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Research direction

Reproduce the shutdown with the listed BTT SKR mini E3 V3, BTT Relay V1.2, and BTT Pi V1.2 hardware, comparing V3 Debian12 with V3.1 Debian13 and the two mentioned G-code models. Start with the [output_pin power_detect] configuration on PC13; done means determining why V3.1 triggers the relay and printing both models without the printer powering off.

Written by the indexing model from the issue text.

Assessment

Tech stack
linux
Domain
embedded-iot, operating-systems
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
48/100

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