There seem to be a few sensors around that give an "equivalent CO2" or "eCO=
2" output, though they are primarily a VOC sensor. Not sure how VOC and CO2=
 levels relate exactly and how exact "equivalent" is. Nevertheless such a s=
ensor might well be suitable for the gas in question.An example is the one =
used in the TE AmbiMate module, though i can't immediately locate a VOC sen=
sor part number...https://www.te.com/usa-en/products/sensors/multi-sensor-m=
odules.html?tab=3Dpgp-storyPerhaps a little slow at 60s.Whatever you do, do=
n't use relay contacts to alert that flammable gas is present~!
-------- Original message --------From: James Cameron <quozl@laptop.org> Da=
te: 8/19/19  9:46 PM  (GMT+12:00) To: "Microcontroller discussion list - Pu=
blic." <piclist@mit.edu> Subject: Re: [EE] flammable gas detector blues Bot=
h the caravans and exploding house scenarios may benefit from heatrecovery =
ventilation, where a structure containing a heat exchanger isused to ensure=
 the inside of the box never has an atmospheric mixunlike the standard plan=
etary atmosphere.On the other hand, if it is standard an attacker could fig=
ure outwhere to insert their attack.-- James Cameronhttp://quozl.netrek.org=
/-- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archiveView/ch=
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