[Diy_efi] electronic nose

[Matthew Bormet]

Here's the correct link for ya: http://www.figarosensor.com/gaslist.html

Any idea how well this would work in an automotive tuning application?

Matt

----- Original Message ----- 
From: "Phil Hunter" <diy-efi at t-n-e.com>
To: <diy_efi at diy-efi.org>
Sent: Sunday, September 12, 2004 10:34 PM
Subject: [Diy_efi] electronic nose


> I'll start w/ a disclaimer that my place of underemployment advertises in
> the magazine below, other than that, no associations w/ this post.
>
> Figaro makes a variety of sensors to detect various chemicals and gases.
> Some are highly selective, responding only to certain gases and ignoring
> most everything else, others are more general in what they detect. They
> have sensors for gasoline & diesel exhaust, carbon monoxide, R-12 & 
> R-134a,
> combustible gases such as propane & hydrogen, and many others:
> http://www.figarosensors.com/gaslist.html
> Prices range from about $15 to $57 USD.
>
> The Sept. '04 issue of Nuts & Volts magazine has an article on building an
> "electronic nose" using a Figaro sensor. Basically the sensor is 
> configured
> as one leg in a Wheatstone Bridge, and a PIC microcontroller is used
> to measure the Bridge's imbalance and drive a speaker to give an audible
> indication of gas concentration. The schematic is in the article, but
> unfortunately the parts list was left out, it can be downloaded here:
> http://www.nutsvolts.com/toc_Pages/TOC_Related_Info/sep04_sniffer.htm
> Back issues of the magazine can be purchased.
>
> The author cleverly laid out the PCB in a round disk the size of a MagLite
> flashlight lens. A 4 D-size cell model of the flashlight provides the
> case and power supply. No permanent modifications are made to the MagLite
> so it can be reverted back to a flashlight. The author has made the PCB
> and programmed uC available, sensors are available from Figaro, and the
> rest of the electronic components are from DigiKey & Radio Shack. 
> Smoldering
> it all together is done by you.
>
> rgds,
> philh
>
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