LEDs can shed infrared light on low cost, long lifetime sensors to monitor carbon dioxide levels in buildings, suggests Ralph Weir. To most people carbon dioxide (CO2) is a ‘greenhouse gas’, but not directly harmful to humans. We breathe it out, plants take it in for photosynthesis. Whereas miners once took canaries into the mines ...
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from Electronics Weekly https://www.electronicsweekly.com/news/infra-red-lit-sensors-can-spot-carbon-dioxide-2017-09/
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