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Revert "Update derivative.markdown" (#26402)

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Erik Montnemery 2023-03-01 10:55:50 +01:00 committed by GitHub
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source/_integrations/derivative.markdown
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@ -18,9 +18,8 @@ ha_platforms:
ha_integration_type: helper
---
The derivative ([Wikipedia](https://en.wikipedia.org/wiki/Derivative)) integration creates a sensor that "smooths-out" another sensor (the **source sensor**).
Derivatives of the specified sensor will be averaged in a given time window with a Simple Moving Average algorithm weighted by time. This is, for instance, useful for a sensor that outputs discrete values or to filter out short-duration noise.
Derivative sensors are updated upon changes of the **source sensor**.
The derivative ([Wikipedia](https://en.wikipedia.org/wiki/Derivative)) integration creates a sensor that estimates the derivative of the
values provided by another sensor (the **source sensor**). Derivative sensors are updated upon changes of the **source sensor**.
For sensors that reset to zero after a power interruption and need a "non-negative derivative", such as bandwidth counters in routers, or rain gauges, consider using the [Utility Meter](/integrations/utility_meter/) integration instead. Otherwise, each reset will register a significant change in the derivative sensor.
@ -83,7 +82,7 @@ unit:
required: false
type: string
time_window:
description: The time window in which to calculate the derivative. By default the derivative is calculated between two consecutive updates without any smoothing.
description: The time window in which to calculate the derivative. Derivatives in this window will be averaged with a Simple Moving Average algorithm weighted by time. This is for instance useful for a sensor that outputs discrete values, or to filter out short duration noise. By default the derivative is calculated between two consecutive updates without any smoothing.
default: 0
required: false
type: time