[sdiy] kinda interesting audio arduino thing

[Michael Zacherl]

On May 22, 2008, at 12:58 PM, Michael Zacherl wrote:

>
> see http://blip.tv/file/920755/
>
> I just wondered if the circuit _has to_ be AC-coupled ...

"The output is filtered through a bypass capacitor C9 which will keep  
any DC voltage from going to the speaker, which could damage it."

So if that would be the only reason...

But if just the playback takes so much space for the code it's not  
really the ideal device for more:

"* Can this shield record audio?
There is no hook-up for a microphone, so there is no easy way to  
record audio. There is also not enough program space on the current  
Arduino chips (atmega168) to support recording audio and saving it to  
the SD card as well as playback."
<http://ladyada.net/make/waveshield/faq.html>

It's not feasible ... not really ...

    Michael.




> On May 21, 2008, at 9:49 PM, Jason Proctor wrote:
>
>> and in fact the ladyada blog just carried some code to set the  
>> audio playback rate from an analogue pin!
>>
>>
>>> Ah, interesting idea... I saw the "wave shield" a few days ago and
>>> couldn't really think of a use for it. But, this is definitely an
>>> interesting one!
>>>
>>> On the page, she says "Then it sets up the audio interrupt that will
>>> go off sample-rate times a second. For example, if its a 22KHz audio
>>> sample, the interrupt will go off 22,000 times a second!"
>>>
>>> My uneducated guess is that changing this rate should be possible,  
>>> and
>>> could also be associated with one of the analog-input pins of the
>>> arduino. Maybe email ladyada directly and request that this option  
>>> be
>>> added to the code library... seems like it might open up some
>>> possibilities!
>>>
>>> Mike
>>>
>>>
>>>
>>> On Thu, May 15, 2008 at 7:05 AM, Jason Proctor <jason at redfish.net>  
>>> wrote:
>>>> http://www.ladyada.net/rant/2008/05/new-kit-wave-shield-for-arduino-plays-high-quality-audio/
>>>>
>>>> i wonder whether the software supports playing the files at  
>>>> different
>>>> speeds. hooked up with a voltage input on an analogue pin...
>>>
>
>
>
> --
> hear the colours of noise: http://blauwurf.at
>
>
>
>
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