Comments on: PWM audio generation with an AVR http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/ Fresh hacks every day Wed, 25 Nov 2009 14:48:56 +0000 http://wordpress.com/ hourly 1 By: MaX-mod http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31637 MaX-mod Sat, 01 Mar 2008 20:26:08 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31637 Surely you can use the open sourced mp3 lib used in the dsPIC mp3 player if you find any AVR powerfull enought.<br><br>ogg is more complex from what I recall...<br><br>But hey, dsPIC are pretty cheap from microchip: free ;)<br><br>Max Surely you can use the open sourced mp3 lib used in the dsPIC mp3 player if you find any AVR powerfull enought.

ogg is more complex from what I recall…

But hey, dsPIC are pretty cheap from microchip: free ;)

Max

]]> By: Dane http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31636 Dane Thu, 14 Feb 2008 11:37:10 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31636 Thanks for the reply. The link is really interesting. the goal of this 'hack' was to add audio output using a low speed, cheap micro controller and a few cents of components... To process mp3 files, you would need either a separate decoder ic, or a relatively fast micro with software mp3 decoding, using unsigned, non-floating point math. these are both perfectly acceptable methods, but require components that arent available in every lab . you did get me thinking though,... how hard would it be to make an mp3 decoding library for something like a cheap AVR. it sure would be sweet, instead of buying a 18 dollar VS1002, just program an avr / pic. thanks for the idea. Thanks for the reply. The link is really interesting. the goal of this ‘hack’ was to add audio output using a low speed, cheap micro controller and a few cents of components… To process mp3 files, you would need either a separate decoder ic, or a relatively fast micro with software mp3 decoding, using unsigned, non-floating point math. these are both perfectly acceptable methods, but require components that arent available in every lab . you did get me thinking though,… how hard would it be to make an mp3 decoding library for something like a cheap AVR. it sure would be sweet, instead of buying a 18 dollar VS1002, just program an avr / pic. thanks for the idea.

]]> By: MaX-MoD http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31635 MaX-MoD Sat, 09 Feb 2008 15:53:01 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31635 not really a hack... and nothing really impressive as there are many PIC-based audio players taht do the same.<br>Or eaven better: MP3.<br>Still in dev but rather close to a usable portable MP3 player. Have a look here : <a href="http://forum.microchip.com/tm.aspx?m=166133" rel="nofollow">http://forum.microchip.com/tm.aspx?m=166133</a><br><br>lost track of the dsPIC .ogg player, tought.<br><br>Max not really a hack… and nothing really impressive as there are many PIC-based audio players taht do the same.
Or eaven better: MP3.
Still in dev but rather close to a usable portable MP3 player. Have a look here : http://forum.microchip.com/tm.aspx?m=166133

lost track of the dsPIC .ogg player, tought.

Max

]]> By: Gilad http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31634 Gilad Sat, 09 Feb 2008 10:32:12 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31634 Funny, just read this article yesterday which implements audio interface with the mega32 and was thinking of trying it out...<br><a href="http://www.riccibitti.com/witnesscam/entry/witnesscam.htm" rel="nofollow">http://www.riccibitti.com/witnesscam/entry/witnesscam.htm</a><br> Funny, just read this article yesterday which implements audio interface with the mega32 and was thinking of trying it out…
http://www.riccibitti.com/witnesscam/entry/witnesscam.htm

]]> By: macegr http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31633 macegr Fri, 08 Feb 2008 21:58:04 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31633 somewhat interesting, but way too bulky of an approach if you wanted the avr to make sound without being tethered to a computer (that already has a sound card). what would be really impressive is a routine for playing speech coded audio using adpcm, or even linear predictive coding with celp. an atmega with decent flash could store up to a couple minutes of audio that way. somewhat interesting, but way too bulky of an approach if you wanted the avr to make sound without being tethered to a computer (that already has a sound card). what would be really impressive is a routine for playing speech coded audio using adpcm, or even linear predictive coding with celp. an atmega with decent flash could store up to a couple minutes of audio that way.

]]> By: dane kouttron http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31632 dane kouttron Fri, 08 Feb 2008 20:00:56 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31632 If there's enough interest i could probably throw this together on an arduino (what i was origionally going to do)<br>-Dane If there’s enough interest i could probably throw this together on an arduino (what i was origionally going to do)
-Dane

]]> By: David Fowler http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31631 David Fowler Fri, 08 Feb 2008 19:48:54 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31631 There is a series of articles about audio with Arduino AVRs at uCHobby that could be interesting. <br><a href="http://www.uchobby.com/index.php/2008/01/08/arduino-audio-dac-options/" rel="nofollow">http://www.uchobby.com/index.php/2008/01/08/arduino-audio-dac-options/</a><br> There is a series of articles about audio with Arduino AVRs at uCHobby that could be interesting.
http://www.uchobby.com/index.php/2008/01/08/arduino-audio-dac-options/

]]> By: Gregtex http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31630 Gregtex Fri, 08 Feb 2008 18:05:07 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31630 @ Dane<br><br>yeah, the source code was pretty hard to design, cause i wrote it with AVR Studio 4 (and its build-in compiler). If i would have used the C/++ compiler, it would have been much easier to write the code, 'cause of the ability to create for-loops much more easily, instead of inserting jumps, adds, if-like-loops and so on.<br><br>The hardest part was the "two legs moving the same time" thing. <br>Because of the limited capability of the AT Mega8 it's just possible to run one timer at the time, so it means you can just run one leg AND THAN the other. So i had to jump after every cycle to the next leg and back again etc etc etc...<br><br>Source code is, printed on normal sheets with Arial 12, 'bout 10 sites pure sickness x) @ Dane

yeah, the source code was pretty hard to design, cause i wrote it with AVR Studio 4 (and its build-in compiler). If i would have used the C/++ compiler, it would have been much easier to write the code, ’cause of the ability to create for-loops much more easily, instead of inserting jumps, adds, if-like-loops and so on.

The hardest part was the “two legs moving the same time” thing.
Because of the limited capability of the AT Mega8 it’s just possible to run one timer at the time, so it means you can just run one leg AND THAN the other. So i had to jump after every cycle to the next leg and back again etc etc etc…

Source code is, printed on normal sheets with Arial 12, ’bout 10 sites pure sickness x)

]]> By: Dane http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31629 Dane Fri, 08 Feb 2008 16:09:19 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31629 Awesome walker robot. genorating 4 seperate servo channels musthave consumed quite a bit of the available space. If your still tinkering with lots of servos, there's a pretty cool routine in bascom-avr (basic compiler) called "config servos", and after configuration, you can just write:<br>servo(1)= variable. as you can guess, its sets the servo to that value. link to pdf:<br><a href="http://www.mcselec.com/index.php?option=com_docman&task=doc_download&gid=140&Itemid=54" rel="nofollow">http://www.mcselec.com/index.php?option=com_docman&task=doc_download&gid=140&Itemid=54</a><br><br>hope any of that helped, <br>keep tinkering Awesome walker robot. genorating 4 seperate servo channels musthave consumed quite a bit of the available space. If your still tinkering with lots of servos, there’s a pretty cool routine in bascom-avr (basic compiler) called “config servos”, and after configuration, you can just write:
servo(1)= variable. as you can guess, its sets the servo to that value. link to pdf:
http://www.mcselec.com/index.php?option=com_docman&task=doc_download&gid=140&Itemid=54

hope any of that helped,
keep tinkering

]]> By: Gregtex http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31628 Gregtex Fri, 08 Feb 2008 14:52:01 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31628 had the same idea when i made my AT-AT Lego Robot controled by an ATM Mega8 ( <a href="http://youtube.com/watch?v=s9pL9znb0SU" rel="nofollow">http://youtube.com/watch?v=s9pL9znb0SU</a> ) for a school project, but didn't knew how to do that... now it's to late, but never the less a cool hack ;) had the same idea when i made my AT-AT Lego Robot controled by an ATM Mega8 ( http://youtube.com/watch?v=s9pL9znb0SU ) for a school project, but didn’t knew how to do that… now it’s to late, but never the less a cool hack ;)

]]> By: Zach http://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/comment-page-1/#comment-31627 Zach Fri, 08 Feb 2008 08:56:27 +0000 http://hackaday.iheartcashews.com:8181/2008/02/07/pwm-audio-generation-with-an-avr/#comment-31627 Go Dane! You're the man! Go Dane! You’re the man!

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