How to call function on idle? Power down PSU.

[wizhippo]

I'm looking in the source and cannot pinpoint it. I would like to disable a pin I have connected to a psu when the printer is idle for x amount of time.

Can you point me to where I may add this?

[lenne0815]

Probably doing it from the raspi i/o is the way to go there, ruling out communication issues for safety: this is what a quick google brought up https://github.com/foosel/OctoPrint/wiki/Controlling-a-relay-board-from-your-RPi

[wizhippo]

Either way, what I am looking for is in Klipper where is idle being detected to turn the motors off?

[lenne0815]

Just check where the ena pin from the stepsticks is called, it wont help much for switching a psu though as the motors are idle on boot. When you just use a psu exclusively for the stepsticks making it possible the second problem comes up; i doubt you can switch it on fast enough to not loose steps on the first movement when waking up.

Easiest way to do it is to add a G4 Sx + SET_PIN PIN=my_pin VALUE=0 ( [digital_output my_pin] ) to switch a pin after your printing gcode. Which can still leave the pin in an unknown state if the microcontroller crashes for whatever reason.

[KevinOConnor]

On Fri, Feb 23, 2018 at 10:48:28AM -0800, Douglas Hammond wrote: I'm looking in the source and cannot pinpoint it. I would like to disable a pin I have connected to a psu when the printer is idle for x amount of time. Can you point me to where I may add this?

There isn't really a mechanism in the code for this today. The closest would be the motor_off_timer / motor_off_handler in toolhead.py. However, if this powers off the mcu, you'd want to notify the mcu code so that it doesn't throw a "comms loss" error. Then there would be the work needed to bring it all back up on activity.

…

-Kevin

[cmock]

One solution that works: using the "PSU control" plugin in Octoprint, and a pin configured in klipper for the PS_ON signal on the RAMPS:

[digital_output power]
pin: !ar12
value: 0
shutdown_value: 0

Then, the plugin can use SET_PIN PIN=power VALUE=1 to turn on the PSU. Basically, I'm replicating the M80/M81 commands used in other firmwares to switch a PSU.

I have my PSU, electronics and hotend fans plus the LED lights wired up directly to the +12V rail, so the printer is really quiet until it actually does work. The plugin does the "idle" handling, including a threshold for the hotend temperature so the hotend fan is not turned off too soon.

The arduino/RAMPS/LCD is powered via USB from the Raspberry, so it is runnning all the time.

The plugin, BTW, could also use a Raspberry GPIO pin to switch the PSU.

[wizhippo]

Psu control with its idle timeout looks like what I am looking for thank you.