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
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