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If BG data is jumpy/noisy, AAPS may dose insulin incorrectly resulting in highs or lows. If you observe errors in your CGM data it is important to disable the loop until the problem is resolved. Depending on your CGM, such issues may be due to the CGM configuration in AAPS (as explained further below); or a CGM sensor site issue (which may require replacing the CGM sensor).
Smoothing data within AAPS
As of AAPS version 3.2, AAPS offers the option to smooth the data within AAPS rather than within the CGM app. There are three options available in Config Builder > Smoothing.
Exponential smoothing
In general, this is the recommended option to start with, as it is most aggressive in resolving noise and rewrites the most recent value. However, see the table below for other specific recommendations.
Average smoothing
This option works similar to back smoothing that was previously implemented on certain CGM platforms. It is more reactive to recent changes in BG value and therefore more prone to responding incorrectly to noisy CGM data.
No Smoothing
Use this option only if your CGM data is being properly smoothed by your collector app before being transmitted to AAPS.
Suggestions to use smoothing
Exponential |
Average |
None |
|
|---|---|---|---|
G5/G6/ONE |
If noisy |
Recommended |
|
G7/ONE+/Stelo |
If noisy |
If stable |
Libre sensors are noisy and can require smoothing. When using xDrip+ direct connection, or the patched app data source (receiving from another app, Juggluco included), smoothing is already done inside the app.
Sensor / Data source |
Juggluco |
xDrip+ direct |
xDrip+ bridge |
xDrip+ patched app |
|---|---|---|---|---|
Libre 1/14 days/Pro |
N.A. |
N.A. |
Average |
N.A. |
Libre 2/2+ (EU) |
Average |
None |
Average |
None |
Libre 2/2+/3/3+ |
Average |
N.A. |
N.A. |
None |