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About Cumulus: Difference between revisions
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=== Reading Weather Station ===
When Cumulus software (of any flavour) interrogates the weather station for more readings, (which is done very frequently) it compares the readings against those read earlier, so it can maintain a whole series of extremes (maximum and minimum in each day, each month, that month in all years, each year, and all-time).
Given that weather stations are prone to having hiccups in their output:
*Cumulus can (for some weather station types only) compare the latest reading with the previous. If the discrepancy is large (and this can be configured), then the new reading is rejected
*If Cumulus is reading a item that should not suddenly decrease (such as a rain counter) then Cumulus can detect whether that is a new starting value or a faulty value
*If a particular reading is not valid, then for up to 6 reads, Cumulus can substitute the last good reading for the invalid one. After those 6 rejections, Cumulus will normally stop work properly and the output value will remain at zero (as Cumulus does not have ability to use "nulls).
*Because temperature, humidity, wind speed, and pressure, are used for calculating derived values, a failure in any of these source sensors will result in incorrect derived values, and may cause Cumulus to stop some processes.
=== Real Time Interval ===
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