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40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
node-red-node-smooth
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====================
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A <a href="http://nodered.org" target="_new">Node-RED</a> node that provides
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several simple smoothing algorithms for incoming data values. These include
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- Minimum
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- Maximum
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- Mean
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- Standard Deviation
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- High Pass Smoothing
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- Low Pass Smoothing
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Install
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-------
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Run the following command in your Node-RED user directory - typically `~/.node-red`
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npm install node-red-node-smooth
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Usage
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-----
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A simple node to provide various functions across several previous values,
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including max, min, mean, standard deviation, high and low pass filters.
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Max, Min, Mean and Standard Deviation work over a rolling window, based on a
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specified number of previous values.
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The High and Low pass filters use a smoothing factor. The higher the number
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the more the smoothing. E.g. a value of 10 is similar to an α of 0.1.
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It is analogous to an RC time constant - but there is no time component to
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this as the code is based on events arriving.
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If `msg.reset` is received (with any value), all the counters and intermediate values are reset to an initial state.
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**Note:** This node only operates on **numbers**. Anything else will try to be
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made into a number and rejected if that fails.
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