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zefanja / aqi

Measure AQI based on PM2.5 or PM10 with a Raspberry Pi and a SDS011 particle sensor
GNU General Public License v3.0
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Sensor reading interval—optimal time? #4

Closed ahabandfedallah closed 5 years ago

ahabandfedallah commented 5 years ago

Using this and loving it. The sensor currently reads for ~30 seconds ever 5 minutes. I've been trying to research what the optimal sensing time is, and some sources say it should be sampling the air constantly. Not sure if I need that for this application (just using it to measure indoor AQI in a future nursery), but does anyone know if there is an optimal interval to take a sensor reading?

zefanja commented 5 years ago

At school we run the measurement every 10min for 2min. Depending where you want to use it. You also need to take in account that the sensor has a limited lifetime, so IMHO I won't measure continuously.

WfromL commented 5 years ago

I've been using a SDS011 for almost 2 years continuously (day and night). Compared to a brand new one last week and readings are within 10%, so still perfectly OK. I made it a portable raspberry, and I walk in the streets to find pollution peaks, so it has to monitor continuously.

zefanja commented 5 years ago

I think there is no optimal internal, it depends really on the use case. If you want constant measurement, than do it. If once in a hour is fine - no need to measure every minute.