Problem solved. The battery I am using already has an under voltage shutoff. 🙂 It cannot be overdrained. So as long as you shutdown on AC failure you should be just fine.
These are the type which I am using - this type of battery (with onboard protection) is very easy to source.
New 2 Polymer 3 7V 500 mAh Battery Li Po for MP3 Tablet PC DVD 062535 0026589 | eBay
New 2 Polymer 3 7V 500 mAh Battery Li Po for MP3 Tablet PC DVD 062535 0026589 | eBay
Sorry for the late reply, I have been travelling. In fact, I will not be able to devote any time to that before the 17th.
giulio
i do not have a scope I am afraid. I can post photos after the 17th.
No, it contains 'No Setup' even in the absence of any connection. I do think it is a software problem.
Yes, Botic is on the eMMC and the sd card with voyage mpd is removed.
giulio
For power supply and battery backup - if you are looking to go beyond the simple - you could always use something like this:
BeagleBone Power Cape - AndiceLabs
BeagleBone Power Cape - AndiceLabs
Hi miero.
Your BBB distribution is clearly finding lots of adopters outside of the original scope of the, now defunct, TP Botic. I think it will soon find it's way into Rune Audio's BBB software and it is being used with non-ESS DACs; I know of a couple of DDAC users for example. This speaks volumes about the openness of the work your doing on our behalf.
Given the seemingly increasingly use of your distribution with non-ESS DACs, which don't have built-in 'lossless' digital volume control, such a feature would, in my opinion, be the icing on the cake if it could be included in your software. I believe this would require a suitable volume control plug-in. Does such a plugin already exist or could one be developed?
By 'lossless' digital volume I'm envisaging something like the ESS approach;
http://www.esstech.com/PDF/digital-vs-analog-volume-control.pdf
I'll be interested to hear your thoughts.
Thanks
Ray
Your BBB distribution is clearly finding lots of adopters outside of the original scope of the, now defunct, TP Botic. I think it will soon find it's way into Rune Audio's BBB software and it is being used with non-ESS DACs; I know of a couple of DDAC users for example. This speaks volumes about the openness of the work your doing on our behalf.
Given the seemingly increasingly use of your distribution with non-ESS DACs, which don't have built-in 'lossless' digital volume control, such a feature would, in my opinion, be the icing on the cake if it could be included in your software. I believe this would require a suitable volume control plug-in. Does such a plugin already exist or could one be developed?
By 'lossless' digital volume I'm envisaging something like the ESS approach;
http://www.esstech.com/PDF/digital-vs-analog-volume-control.pdf
I'll be interested to hear your thoughts.
Thanks
Ray
nautibuoy: I've not tried this, but uncommenting or adding following line in the /etc/mpd.conf should enable software volume mixer in MPD.
Thanks miero.
I presume that will be the standard mpd volume control plug-in, which I believe is only 16bit so loses resolution with increasing attenuation?
Ray
nautibuoy: Why are you so pesimistic? 🙂)
The MPD seems to implements this properly for each sample format.
You can check it at the end of this file: master/mpd.git -
So the quality depends on the current output format (can be forced in mpd.conf).
The MPD seems to implements this properly for each sample format.
You can check it at the end of this file: master/mpd.git -
So the quality depends on the current output format (can be forced in mpd.conf).
Thanks, I'll check the link when I get home this evening; it's blocked here at work.
Ray
Ray - only the name is defunct 🙂 The Hermes-BBB boards will be shipping to us next week. I only changed the name to make sure credit goes where credit belongs. I didn't want to co-opt the Botic name from the driver/distro.
Hermes - BBB is the Cape which will support Botic.
Also there is good reason this thread is here on our forum - this idea was very much a collaborative effort between Miero and I - but he deserves all the credit for the Linux work. He and I have been working through hardware details since the start.
Cheers!
Russ
Sounds promising! Are these production boards?
Can't wait to get my hands on one of these 😀
Yes - assuming they test out fine. 🙂
I ordered a large enough batch that if they test out okay then we can start offering them right away.
I had an earlier prototype which while it worked - it was not really good enough yet - it just did not make sense to offer to the public.
Russ, I was only making the point that miero's distribution has come a long way and found a lot of applications since it's inception as a means of partnering the original Botic cape with a BBB; I understand the original Botic has now been discarded (i.e. defunct) in favour of the redesigned boards that are the Hermes and Chronos.
The topic is where it is, which is fine, and I appreciate that this kicked off as a result of your own initiative to develop an open embedded audio appliance, without which miero's wonderful opensource distribution might not have happened.
Ray
Phew! I'll have to put my thinking head on to work through that! (unless there is a crib sheet, such as a logical design document). Looks like I have some weekend homework.
Ray
Aha, it was indeed a software/operator 😡 problem. All that was while trying to play music using squeezelite! I assumed I could just install it and be ready to go. It turns out that's not the case.
If I play a local file using play everything works as it should. The Buffalo plays music. Sorry for the confusion.
Now if only somebody could help me making squeezelite work under the botic installation I would be a happy camper..
TIA
Giulio
I use Squeezelite with the Botic drivers - no problems. What is it that does not work?
I have a cheat-sheet I use (in case I forget) for the whole install/set-up if you want. BTW there are some specific startup parms for squeezelite using the Botic drivers that need to be used.
Here is my startup string, -u and -r parms only used if upsampling:
squeezelite -o hw:CARD=BOTICAudio -n Botic96 -a 16384:1024:: -u mIX -r 96000 -z
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Thanks Ray - I was only trying to clarify in case someone though I had given up on the idea. 🙂
Cheers!
Russ
The dac does not lock and the content of /cat/proc/../hw_parameters is
"No setup"
Other than the resampling option and the -a parameters, that are not compulsory my squeezelite command is the same as yours. Are you using squeezelite with the botic install on miero's website or have you compiled the driver into some other distro?
I have the impression I am missing some dependency or some alsa configuration file. But this is not necessary with other distros when using a USB dac.
Actually I found after some discussion with Triode and Miero that the -a parm I am using is necessary with Miero's drivers. I was getting some strange alsa messages from squeezelite to do with buffer sizes I think.
I simply load miero's distro onto the SD card and boot up. Then install squeezelite - no extras required.