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M1GEO - air particulate sensor
M1GEO's blog, found https://www.george-smart.co.uk/projects/lnb-bias-tee/ when looking for bias tees.Fri Nov 25 15:02:55 2022 - permalink -
Another air quality sensor is described on https://www.george-smart.co.uk/2021/02/an-esp8266-based-air-quality-sensor/- https://www.george-smart.co.uk/2020/02/air-particulate-sensor/