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15 lines
695 B
Markdown
15 lines
695 B
Markdown
# Adding new, derived types
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In the section [*Adding a second data source*](../service_engine/#Adding_2nd_source), we
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saw an example of how to create a new type for a new data source. But,
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what if you just want to add a type that is a derivation of existing
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types? The WeeWX type `dewpoint` is an example of this: it's a
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function of two observables, `outTemp`, and `outHumidity`.
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WeeWX calculates it automatically for you.
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Calculating new, derived types is the job of the WeeWX XTypes system. It
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can also allow you to add new aggregation types.
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See the Wiki article [*Extensible types (XTypes)*](https://github.com/weewx/weewx/wiki/xtypes)
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for complete details on how the XTypes system works.
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