node-red-nodes/function/smooth/17-smooth.html

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        <input type="text" id="node-input-property" style="width:70%;"/>
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    <div class="form-row">
        <label for="node-input-action"><i class="fa fa-bolt"></i> Action</label>
        <select id="node-input-action" style="width:60%; margin-right:5px;">
            <option value="max">Return the maximum value seen</option>
            <option value="min">Return the minimum value seen</option>
            <option value="mean">Return the mean value</option>
            <option value="sd">Return the standard deviation</option>
            <option value="low">Perform low pass filter</option>
            <option value="high">Perform high pass filter</option>
        </select>
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    <div class="form-row">
        <label for="node-input-count">&nbsp;</label>
        <span id="node-over">over the most recent </span>
        <input type="text" id="node-input-count" placeholder="10" style="width:50px;"/>
        <span id="node-over2"> values</span>
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    <div class="form-row">
        <label for="node-input-round">(optionally)</label>
        round to <input type="text" id="node-input-round" placeholder="ignore" style="width:50px;"/> decimal places
    </div>
    <div class="form-row">
    <label for="node-input-mult">Treat</label>
        <select id="node-input-mult" style="width:60%; margin-right:5px;">
            <option value="single">All msg as one stream.</option>
            <option value="multi">Different msg.topic as individual streams.</option>
        </select>
    </div>
    <div class="form-row" id="row-input-reduce">
        <label for="node-input-reduce"><i class="fa fa-compress"></i> Reduce</label>
        <input type="checkbox" id="node-input-reduce" style="display:inline-block; width:20px; vertical-align:baseline;">
        only emit one message per most recent N values
    </div>
    <br/>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-tips" id="node-tip">Tip: This node ONLY works with numbers.</div>
</script>

<script type="text/html" data-help-name="smooth">
    <p>A simple node to provide various functions across several previous values, including max, min, mean, high and low pass filters.</p>
    <p>Messages arriving with different <code>msg.topic</code> can be treated as separate streams if so configured.</p>
    <p>Max, Min and Mean work over a specified number of previous values.</p>
    <p>The High and Low pass filters use a smoothing factor. The higher the number the more the smoothing. E.g. a value of 10 is similar to an &alpha; of 0.1. It is analagous to an RC time constant - but there is no time component to this as the time is based on events arriving.</p>
    <p>Enabling the Reduce option causes the node to only emit one message per N values (available for the Max, Min and Mean functions). E.g. if set to Mean over 10 values, there will only be one outgoing message per 10 incoming ones.</p>
    <p>If <code>msg.reset</code> is received (with any value), all the counters and intermediate values are reset to an initial state.</p>
    <p><b>Note:</b> This only operates on <b>numbers</b>. Anything else will try to be made into a number and rejected if that fails.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('smooth', {
        color: "#E2D96E",
        category: 'function',
        defaults: {
            name: {value:""},
            property: {value:"payload",required:true},
            action: {value:"mean"},
            count: {value:"10",required:true,validate:RED.validators.number()},
            round: {value:""},
            mult: {value:"single"},
            reduce: {value:false}
        },
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        outputs: 1,
        icon: "smooth.png",
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                    $("#node-over").html("with a smoothing factor of ");
                    $("#node-over2").html("");
                    $("#row-input-reduce").hide();
                }
                else {
                    $("#node-over").html("over the most recent ");
                    $("#node-over2").html(" values");
                    $("#row-input-reduce").show();
                }
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            if ($("#node-input-round").val() === "true") {
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