beaglebone green wireless is shutdown

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1

Hello folks

My name is Felipe and I looking for solution or some hint to my newest problem.
I got a BBGW running BeagleBoard.org Debian Image 2016-11-06. My project is get many measurements from differents sensors like conductivity, dissolved oxygen, and others. and put this values into web server using mobile broadband. The problem is that system is shuting down. I looking in log files I don’t get many information. the most relevant information that i got is in /var/log/auth.log and says.

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Feb 9 11:06:01 beaglebone CRON[1050]: pam_unix(cron:session): session opened for user root by (uid=0)
Feb 9 11:06:03 beaglebone CRON[1050]: pam_unix(cron:session): session closed for user root
Feb 9 11:07:33 beaglebone login[574]: pam_unix(login:auth): check pass; user unknown
Feb 9 11:07:33 beaglebone login[574]: pam_unix(login:auth): authentication failure; logname=LOGIN uid=0 euid=0 tty=/dev/ttyGS0 ruser= rhost=
Feb 9 11:07:36 beaglebone login[574]: FAILED LOGIN (1) on ‘/dev/ttyGS0’ FOR ‘UNKNOWN’, Authentication failure
Feb 9 11:08:01 beaglebone sshd[1107]: Accepted password for debian from 192.168.7.1 port 37207 ssh2
Feb 9 11:09:01 beaglebone CRON[1153]: pam_unix(cron:session): session opened for user root by (uid=0)
Feb 9 11:09:03 beaglebone CRON[1153]: pam_unix(cron:session): session closed for user root
Feb 9 11:09:23 beaglebone systemd-logind[357]: Power key pressed.
Feb 9 11:09:23 beaglebone systemd-logind[357]: Powering Off…
Feb 9 11:09:23 beaglebone systemd-logind[357]: System is powering down.
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my system have a beaglebone green wireless, 1 PCB that feed beaglebone from charger controller that connect to battery and power supply.

Thanks for your attention
Regards
Felipe

2

looks like a power glitch. how are you powering this?

3

Hello Wulf

My beaglebone is powering in P9_5 and P9_6 pins from DC DC converter that supplies 5V from battery (charger controller).

4

Is it exactly 5V? How much ripple is there on the 5V supply? What is the power source for the DC DC converter?

Gerald

5

Hello Gerald.

DC-DC converter is stable at five volts in almost time, but there are some events that looks like this picture. (voltage is under 4 volts.)

6

It needs to be steady at 5V. 4V is not going to work very well. You can try adding some bulk capacitance across the connections. Maybe 10uF to 20uF and add a 0.1uF as well…

Gerald

7

The PMIC IC in the Beaglebone will force quit the BBB if the 5V line is above 5.5 Volts or below 4.5 Volts, even for a few milliseconds.

So, if you want to to have a happy BeagleBone Black, keep your BBB 5 Volt power input between 4.75 and 5.25 Volts, to give yourself some safety margin for power noise, etc.

— Graham

8

Thanks for the answer. Today were added two capacitor of .1uF and 10uF in power line to beaglebone. System is testing about 4 hours and works fine (all weekend will be testing)