How long does the Aranet4 device store historic data?
The amount of historical measurement data stored is directly tied to the measurement interval set on the device:
Memory management
Altering the measurement interval triggers a restructuring of existing data in the memory system.
For instance, switching from a shorter interval (e.g., 1 minute) to a longer one (e.g., 10 minutes) aggregates ten 1-minute measurements to compute and store an average value. Conversely, adjusting from a longer interval (e.g., 10 minutes) to a shorter one (e.g., 1 minute) generates supplementary data in 1-minute intervals by extrapolating values from 10-minute measurements, creating a sequence of 10-minute "steps" with identical values.
Frequent changes in measurement intervals are discouraged due to resulting data loss caused by averaging and padding.
If more frequent measurements are required, use "on-demand measurement" feature for instant measurement.
Background data download
The data can be downloaded in the background if the application runs as a background process and "Background data read" is enabled in the app settings.
Note: This information pertains to firmware version v1.4.14 onwards. Refer to the changelog in the forum post for additional details.
Hello,
When I first launched my Aranet4, it created a huge peak of CO2 (more than 4000ppm) in the graphics displayed on my iphone. This was certainly a fake "very first" measurement. The problem is that this peak doesn't disappear (is not overwritten by new data) after one week, knwing my interval setting is 1 min. (so it should have been overwritten after 3.5 days if I understood well...). And this peak is so high, that it "crushes down" the real data on the display. I did fully restart the app several time, but nothing change. So, please, how to get rid of this initial peak on the data display ?
Best regards,
Antoine
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