The shut off needs to have a delay otherwise you are killing the power in a running system. The delay gives the OS time to do an actual shutdown.
On Wed, Feb 16, 2022 at 10:38 AM Roland Jollivet <roland.jolli...@gmail.com> wrote: > On Wed, 16 Feb 2022 at 16:17, Thaddeus Waldner <thadw...@gmail.com> wrote: > > > > Just use a simple 10A relay with 5V coil > > > As a latch, you press a button to power up, ie power the coil, then the > > > same line gets dropped by the Pi to power off.. > > > > How does the pi drop the 5v line after shutting down? > > > The circuit can be similar to attached.. > But I've got no idea if there are 'hooks' in Linux so you could add code to > drop the relay at the end-of-shutdown. > Or whether you can get Linux to pull in the relay on power-up > > I presume this has to be in Linux, not LinuxCNC. > Ok, I did a quick search and found this; > > https://stackoverflow.com/questions/45128655/where-does-acpi-hook-into-the-shutdown-sequence-on-linux-to-soft-off-the-pc > > Roland > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Chris Albertson Redondo Beach, California _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
