Add POWER_OFF_DELAY option

[Kannix2005]

Description

Added a power off timeout before the printer/mainboard is shut off to enable a cooldown fan or other appliances to be powered even if the print has finished. The delay can be given in seconds.

Benefits

Power off delay not existing.

Configurations

POWER_OFF_DELAY added in Configuration.h under PSU_CONTROL section.

Related Issues

• none -

[GMagician]

Doesn't a G4 in PSU_POWEROFF_GCODE work?

[boelle]

i tried to search for PSU_POWEROFF_GCODE in both config files and could not find it

[Kannix2005]

Doesn't a G4 in PSU_POWEROFF_GCODE work?

No not really: the printer won´t report a finish to e.g. octoprint with the added G-Code, because it is still "printing".

[thinkyhead]

This is slightly problematic, because there's no way to cancel the power-down, but you could go ahead and start a new print job while waiting for a long shutdown delay, and then the power would turn off at some point during the print job. It would be better to piggyback off of the POWER_TIMEOUT feature and just do this instead of spinning in safe_delay() to get the same effect, but in a way which can be canceled:

lastPowerOn = millis() - (POWER_TIMEOUT) + (POWER_OFF_TIMEOUT);