Beaglebone Black does not startup automatically when power is supplied

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1

Hi all,

I have a BeagleBone Black, Rev A5B which I boot from the micro SD card with Debian 10 (Buster). If I shutdown the system with “shutdown -h now”, it switches off but if I then switch off and switch on the 5V power (via the barrel jack), the board does not boot up again. Only after I manually press the power button it boots again. Is there a way to configure it to boot without a manual key press once power is back?

Best regards,
Reiner

2

Possibly your 5V power supply is not coming on in a way that the
on-board distribution system is detecting it correctly. Does the power LED
come on?

  My revC with a 5V 2A wall-wart supply, stuck into a wall socket
controlled with a lamp switch, powered up nicely when I flipped the wall
switch.

3

The power supply is on all the time. I just switch the 5V on/off with a switch. After switching on, the power LED is not on. If I then press the Power button, the power LED switches on and the board boots.

4

What power supply with a switch are you using? Did you add a switch inline with a barrel jack power supply or is it part of the power supply adapter you are using?

Cheers,

Jon

5

So you aren't switching the power supply, but somehow are toggling some
sort of inline switch on the power lead?

<shudder>

  Switch bounce could be scaring (if not scarring) the PMIC -- if it sees
a series of up/down transitions from the bounce (use a storage tube or
digital oscilloscope with probe and ground held to the end&side of the
barrel connector, and flip the switch -- if you see ___|-|_|-|_|---- at the
start of the sweep, you have switch bounce). Pushing the power button is
taking place after the voltage stabilized. Possibly fitting a capacitor
between the power leads (value TBD -- large enough to smooth out bounce,
but small enough to not cause the opposite problem of a too slow
transition) would help.

6

I use a Mean Well ELP-75-5-Cpower supply. The switch is inline with the barrel jack power cord.

https://www.thingiverse.com/thing:4323103
https://www.thingiverse.com/thing:4543253
https://www.thingiverse.com/thing:4326381

I have a Raspberry Pi on another port of that setup where it works fine. Just the BeagleBone Black doesn’t want to start without another manual keypress.

1 Like
7

Hi Reiner, I’m wondering if you ever solved this problem? I have the same issue where I want my BB Blue to boot up once power is applied thru the 12V 5mm barrel jack.