Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 30th September 2014, 01:11 PM   #1001
Ronbot is offline Ronbot
diyAudio Member
 
Join Date: Sep 2014
The cape does have the ability to pull PWR_BTN low and does monitor "power good" from the charger. The cape is normally passive here - just presenting the information via I2C for Linux applications and responding to I2C commands. However, it'd be an easy change to have it hold the power button for 8 seconds after some programmable duration of power loss.
  Reply With Quote
Old 30th September 2014, 01:43 PM   #1002
barrows is offline barrows
diyAudio Member
 
Join Date: Jul 2010
Default Hmmm...

I power my current Linux server (Mobo, small flash drive for OS, 1.5 HD for storage, and an SOtM USB out card) with an internal LiFePO4 battery supply, using a separately filtered and regulated leg for the SOtM card. It is set up so that the server can run while the charger is active or disconnected.
Why not power a BBB/Botic the same way? This way you avoid a possibility of power interruption as long as you keep the battery in a decent charge state, and you get the further benefit of mot having any computer connected to the mains and spewing noise bakc into your other components. The current draw of the BBB is so low you will not even need a really big pack.
For critical listening you disconnect, and unplug from the wall, the charger, the rest of the time you can just leave the charger connected.
  Reply With Quote
Old 30th September 2014, 07:05 PM   #1003
Greg Stewart is online now Greg Stewart  United States
diyAudio Member
 
Join Date: Jul 2003
Location: Columbus, Mississippi
Building an open embedded audio applicance.
Default Barrows, I saw your postings on that server on Computer Audiophile...

Quote:
Originally Posted by barrows View Post
<SNIP>Why not power a BBB/Botic the same way? This way you avoid a possibility of power interruption as long as you keep the battery in a decent charge state, and you get the further benefit of mot having any computer connected to the mains and spewing noise bakc into your other components. The current draw of the BBB is so low you will not even need a really big pack.
For critical listening you disconnect, and unplug from the wall, the charger, the rest of the time you can just leave the charger connected.
+1 as a way of integrating a battery with the BBB

Greg in Mississippi
__________________
Everything matters!
  Reply With Quote
Old 30th September 2014, 11:29 PM   #1004
linuxfan is offline linuxfan  Australia
diyAudio Member
 
Join Date: Dec 2007
Quote:
Originally Posted by barrows View Post
I power my current Linux server (Mobo, small flash drive for OS, 1.5 HD for storage, and an SOtM USB out card) with an internal LiFePO4 battery supply
...

It is set up so that the server can run while the charger is active or disconnected.
No different from the "option i" under discussion here (first mentioned in post #874).
The only limitation with the BBB's onboard battery management system is a maximum LiPo battery size of 3000mAh. This should get about 7 hours run time between charges - assuming the Botic cape is powered separately.
  Reply With Quote
Old 1st October 2014, 06:15 AM   #1005
nautibuoy is offline nautibuoy  United Kingdom
diyAudio Member
 
nautibuoy's Avatar
 
Join Date: Jan 2010
Location: Somerset, England
Trying to pull these various elements together in my thinking I've arrived here...

  • Use the BBB as an appliance, 'permanently' running. As it's network connected it can be administered/shutdown/etc. remotely via a tool like puTTy with only a little inconvenience.
  • For serious listening, power the BBB with a suitable battery only (6-7hrs duration would generally work for me).
  • At all other times use a suitable (linear) power supply to run the BBB, using the BBB's internal power management to recharge the battery.

It shouldn't be too hard to implement a 'standby' switch arrangement that turns on the power supplies for the DAC and I/V and disconnects the BBB's linear supply at the start of a listening session and then reverses it at the end of a session.

I believe that running the BBB from a circa 4V battery means USB power will not be available on the BBB so assume USB storage devices won't function - not a problem for me.

I'm guessing that Botic will need it's own 5V supply to run its onboard regulators?

As the Botic will be providing clocking to the Botic are there any implications of powering the Botic up/down with the BBB still running - care to comment Russ/miero?

Ray
  Reply With Quote
Old 1st October 2014, 06:26 AM   #1006
miero is offline miero  Czech Republic
diyAudio Member
 
Join Date: Jun 2011
Location: Prague
The 5V line on BBB and Botic cape are shared.

BBB can power the Botic up/down via GPIO pin - there is voltage regulator with a switch on the cape.

Cape will have battery pin for BBB, but only for powering BBB and not for cape - because 5V is not available when BBB is running on battery.
  Reply With Quote
Old 3rd October 2014, 04:21 AM   #1007
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
lykkedk's Avatar
 
Join Date: Dec 2002
Location: Denmark, Fredericia
Default BBB

Hi.

I have been reading through this thread roughly. Hope that i can get this answered, cause it's not all clear to me!

The issue with the batteri/shutdown-script, isen't it just because, one want to make the BBB shutdown gracefully, even when power is unplugged?
Or is there other isues.

Shutdown gracefully, makes the read-write filesystems on the mmc card, sync and write data, before power is cut/standby, right?

Ideally, would it then be, booting into initrd, and newer leave that?,
Soo that most filefsystems remains readonly? (Usr/ ... /lib ... Etc...)

Just a thought

Regards Jesper
__________________
DCG3 Dual DCSTB, R2R DAC in build (2 ReflectorD's (+5VDC/+3.3VDC) + SSLV1.1 (+/-12VDC))
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
  Reply With Quote
Old 3rd October 2014, 06:10 AM   #1008
nautibuoy is offline nautibuoy  United Kingdom
diyAudio Member
 
nautibuoy's Avatar
 
Join Date: Jan 2010
Location: Somerset, England
Quote:
Originally Posted by lykkedk View Post
Hi.

I have been reading through this thread roughly. Hope that i can get this answered, cause it's not all clear to me!

The issue with the batteri/shutdown-script, isen't it just because, one want to make the BBB shutdown gracefully, even when power is unplugged?
Or is there other isues.

Shutdown gracefully, makes the read-write filesystems on the mmc card, sync and write data, before power is cut/standby, right?

Ideally, would it then be, booting into initrd, and newer leave that?,
Soo that most filefsystems remains readonly? (Usr/ ... /lib ... Etc...)

Just a thought

Regards Jesper
My understanding is that just pulling the plug risks killing the BBB device.

Ray
  Reply With Quote
Old 3rd October 2014, 07:53 AM   #1009
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
lykkedk's Avatar
 
Join Date: Dec 2002
Location: Denmark, Fredericia
Hi.

Quote:
My understanding is that just pulling the plug risks killing the BBB device.

Ray
I find it hard to understand (not that i did not read that somewhere!),
that it's possible to damage the "hardware", by just pulling the plug!

Is this something, which is confirmed?
My guess is, that it's only kernel/files etc... which is corrupted when unplugging power...

The case is, that if everything is run from initrd, and kernel/usr etc... is RO(Readonly), corruption cannot occour!

Hope, we can discuss this a bit here, as i find it very interessting

Jesper.
__________________
DCG3 Dual DCSTB, R2R DAC in build (2 ReflectorD's (+5VDC/+3.3VDC) + SSLV1.1 (+/-12VDC))
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
  Reply With Quote
Old 3rd October 2014, 08:11 AM   #1010
nautibuoy is offline nautibuoy  United Kingdom
diyAudio Member
 
nautibuoy's Avatar
 
Join Date: Jan 2010
Location: Somerset, England
I think miero had first hand experience of a dead BBB. It's why there has been so much talk about protecting the BBB with proper shutdown and ups.

Ray
  Reply With Quote

Reply


Building an open embedded audio applicance.Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tractrix in 1*Pi and 2*Pi revintage Multi-Way 21 26th August 2011 09:37 PM
PI Speakers Haknhendrix Multi-Way 1 13th November 2003 06:52 PM
What is 2 pi and 4 pi EternaLightWith Multi-Way 12 13th October 2003 01:28 AM
PI-Filter wuffwaff Solid State 39 3rd January 2002 01:05 PM


New To Site? Need Help?

All times are GMT. The time now is 03:54 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki