Using Arduino and LEDs as Gas Detectors: Resources and Circuit Examples

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#1 21683219 17 Sep 2019 01:46

Phil Warn Phil Warn

Anonymous

Post #1
21683219 17 Sep 2019 01:46

In one of the many Arduino books I have, it talks about using LEDs as a photometer. can some kind person point me to a source of info about using a LED as a gas detector many thanks, Phil
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#2 21683220 19 Sep 2019 21:29

Elizabeth Simon Elizabeth Simon

Anonymous

Post #2
21683220 19 Sep 2019 21:29

Phil,
I don't think that an LED can be used as a general-purpose gas detector. An LED can detect light (in addition to emitting light) so it could detect colored gas or possibly just dense gas. I found this article on makezine which includes a link relating to atmospheric studies.

https://makezine.com/projects/build-an-led-photometer/Hope this helps,Elizabeth
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#3 21683221 20 Sep 2019 12:01

Christilda Nancy Christilda Nancy

Anonymous

Post #3
21683221 20 Sep 2019 12:01

Gases will absorb certain wavelength of Infra-Red rays. For example, CO2 molecules absorb midrange of infrared 4.2-4.4 micron wavelengths.The LED is tuned to emit infrared of the desired wavelength and it is received on the other side by a photodiode(sensor). So more of these wavelengths are absorbed more CO2 is present.In this way, it is used as Gas Detector.Hope this helps:)Nancy
#4 21683222 04 Feb 2023 18:28

StevenFG StevenFG

Anonymous

Post #4
21683222 04 Feb 2023 18:28

I think the LED cannot show the presence of any gas. Especially if it's not painted. I think so because the gas analyzers that are installed in the mines are not based on LEDs.
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Using Arduino and LEDs as Gas Detectors: Resources and Circuit Examples

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