The Figaro TGS 825 hydrogen sulfide sensor needs to be corrected for ambient temperature and humidiy, as Justin Marrese and I discovered at the sensor meetup on Saturday. I found a couple options which beat the $30 sparkfun temp/humidity sensor:
- $15 combined temp/humidity sensor
- $11.45 humidity sensor which could be combined with a thermistor, i guess.
Links: hydrogen sulfide page, Roomba page with sensor datasheets
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