Mauricio Jancic wrote:

>Mmm By mollmass I gues (translation issues)
>
I mean the mass of Avrogado number of molecules ...

> that you mean the unit of
>concentration. Now, how do you say I should detects CO2 an O2 ?
>  
>
When someone is breathing under normal conditions,
there are good estimates for these parameters.
Stef

>Mauricio Jancic
>Janso Desarrollos
>Microchip Consultant Program Member
>info@janso.com.ar
>www.janso.com.ar
>+54 11 4542 3519
>
>  
>
>>-----Original Message-----
>>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
>>Of Stef Mientki
>>Sent: Sunday, February 19, 2006 2:20 PM
>>To: Microcontroller discussion list - Public.
>>Subject: Re: [EE]Breath airspeed measurement
>>
>>
>>    
>>
>>>-          What about a couple of ultrasonic transducers and measuring
>>>      
>>>
>>the
>>    
>>
>>>propagation delay?
>>>
>>>
>>>
>>>
>>>      
>>>
>>should work very good, ...
>>... you even determine the mollmass.
>>You know that the expired air is 36..37 C,
>>100% saturated with water,
>>contains ...% CO2
>>contains ...% O2
>>so you might even detect the alchol directly through mollmass.
>>
>>Stef Mientki
>>--
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>>    
>>
>
>  
>
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