bbb power sequencing

Hello there,
I am in front of a bigger hardware design and while ive been thinking of it i have run into some considerations. I was hoping i could get some ansfers from more exporienced people.

I need some kind of indikator that would hold the relay on on the machine. I cant wait ie. 10 seconds with my finger on the machines button to wait for bbb to boot and start some user program that would pull a gpio to power the relays coil (lets say that user powers the power relay usong a button).

Have any of you been throigh this kind of designs? I am trying to get the same functionality as generic motherboards have with their power buttons. I know i can add an external mcu for power management but i want to keep it parts suffitient.
Any help would be really aprichiated.

Hello there,
I am in front of a bigger hardware design and while ive been thinking of
it i have run into some considerations. I was hoping i could get some
ansfers from more exporienced people.

From my expirience with bbb i know that power can be sequenced correctly
usong power button- press it to power the board and press it to start
shutdown sequence. The problem is that afaik the only hardware power
designator is one pf the blue diodes and that diode pin is not accesible
on the headers.

I need some kind of indikator that would hold the relay on on the
machine. I cant wait ie. 10 seconds with my finger on the machines button
to wait for bbb to boot and start some user program that would pull a
gpio to power the relays coil (lets say that user powers the power relay
usong a button).

Have any of you been throigh this kind of designs? I am trying to get the
same functionality as generic motherboards have with their power buttons.
I know i can add an external mcu for power management but i want to keep
it parts suffitient.
Any help would be really aprichiated.

I'm not sure what you are asking, but the 3V3B pin is the last voltage
rail to turn on. This would indicate that the power on the board is now
stable.

Regards,
John