node-red/nodes/core/logic/16-range.html

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<script type="text/x-red" data-help-name="range">
    <p>Maps a numeric value to a different range.</p>
    <h3>Inputs</h3>
    <dl class="message-properties">
        <dt>payload <span class="property-type">number</span></dt>
        <dd>The payload <i>must</i> be a number. Anything else will try to be
        parsed into a number and rejected if that fails.</dd>
    </dl>
    <h3>Outputs</h3>
    <dl class="message-properties">
        <dt>payload <span class="property-type">number</span></dt>
        <dd>The value mapped to the new range.</dd>
    </dl>
    <h3>Details</h3>
    <p>This node will linearly scale the received value. By default, the result
       is not constrained to the range defined in the node.</p>
    <p><i>Scale and limit to target range</i> means that the result will never be outside
    the range specified within the result range.</p>
    <p><i>Scale and wrap within the target range</i> means that the result will
    be wrapped within the result range.</p>
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