Toxic Gas Sensor

Artificial nose? Helping industry trace their leaks? MRTG for toxic gas?

Welcome to the wonderful world of post-chemistry.

Sniffing

• Carbon Monoxide (CO), Hydrogen (H)
• Hydrogen (H), Ethanol (C2H6O), Iso-butane (CH3CH(CH3)2), Carbon Monoxide (CO), Methane (CH4)
• Toluene (C7H8), Hydrogen Sulfide (H2S), Ethanol (C2H6O), Ammonia (NH3), Hydrogen (H)
• Ethanol (C2H6O), Hydrogen (H), Iso-butane (CH3CH(CH3)2), Carbon Monoxide (CO), Methane (CH4)

Using

• Electronic components sensing various gaseous substances : http://www.selectronic.fr/soussousfamille.asp?fam_ref=05&sfam_ref=98&ssfam_ref=32
• http://www.nexsens.com/support/user_manuals.htm
• http://www.freeduino.org/
• http://www.rosiedaniel.com/2007/04/gas-sensors.html
• http://itp.nyu.edu/physcomp/sensors/Reports/GasSensors

Proposal

• Sensors: cheap sensors made by a company called Figaro - one TGS2600 + one TGS2602. Available at Radiospares and Diltronic (St Germain en Laye)
• Those sensors are already used by http://fridav.ljudmila.org (that's how we found them)
• Based on a Fonera which could connect to the /tmp/lab wireless network and directly post results on the internet
• Using SPI with Fonera: http://www.larsen-b.com/Article/262.html
• ADC: LTC2496 (lekernel: I have an evaluation kit)
• My LTC2496 driver for Linux (lekernel)
• A DCF sensor may be integrated to the sensor system as informations sent to the server will arrive in random order. More information here (french): http://kubuntu.free.fr/blog/index.php/2008/09/30/258-fonera-et-station-meteo-1-port-serie-et-openwrt and here: http://www.buzzard.me.uk/jonathan/radioclock.html

The following diagram shows the overall architecture:

Resources

http://www.airparif.asso.fr/pages/polluants/surveillance http://w2.airparif.asso.fr/cgi-bin/station_files.pl?station=VITRY