node-red-nodes/hardware/neopixel/neopixel.html

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<script type="text/x-red" data-template-name="rpi-neopixels">
<div class="form-row">
    <label for="node-input-pixels"><i class="fa fa-sun-o"></i> LEDs</label>
    <input type="text" id="node-input-pixels" placeholder="number" style="width:60px;"> in the string
</div>
<div class="form-row">
    <label for="node-input-bgnd"><i class="fa fa-picture-o"></i> Background</label>
    <input type="text" id="node-input-bgnd" placeholder="HTML colour name or rrr,ggg,bbb">
</div>
<div class="form-row">
    <label for="node-input-fgnd"><i class="fa fa-picture-o"></i> Foreground</label>
    <input type="text" id="node-input-fgnd" placeholder="HTML colour name or rrr,ggg,bbb">
</div>
<div class="form-row">
    <label for="node-input-mode"><i class="fa fa-cogs"></i> Mode</label>
    <select id="node-input-mode" style="width:73%">
        <option value="pcent">Bar - Percent of length</option>
        <option value="pixels">Bar - Number of pixels</option>
        <option value="pcentneedle">Needle - Percent of length</option>
        <option value="pixelsneedle">Needle - Number of pixels</option>
        <option value="shiftu">Add pixel to start</option>
        <option value="shiftd">Add pixel to end</option>
    </select>
</div>
<div class="form-row">
    <label for="node-input-wipe"><i class="fa fa-clock-o"></i> Wipe time</label>
    <input type="text" id="node-input-wipe" placeholder="number" style="width:60px;"> mS
</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">
</div>
</script>

<script type="text/x-red" data-help-name="rpi-neopixels">
    <p>Raspberry Pi node to drive a string of neopixel or ws2812 LEDs.</p>
    <p>Defaults to a bar chart style mode using configured foreground and background colours.
    It can also display a needle (single pixel) type gauge.</p>
    <p>It can accept a number in <b>msg.payload</b> that can be either the
    number of pixels, or a percentage of the total length.</p>
    <p>If you want to change the foregound colour, you can send a CSV of <i>html colour,length</i>.</p>
    <p>To set the background just send an <i>html colour</i> name.
    <a href="http://html-color-codes.info/color-names/" target="_top">Here
    is a list</a> of html colour names.<p>
    <p>You can also select shift modes where a single colour pixel is added to either the start or the end of the strip.</p>
    <p>The <i>nth</i> pixel is set by <b>msg.payload</b> with a CSV string <i>n,r,g,b</i>
    <!-- <p>The whole strip is set by <b>msg.payload</b> with a CSV string <i>r,g,b</i> -->
    <p>A range of pixels from <i>x</i> to <i>y</i> can be set by <b>msg.payload</b>
    with a CSV string <i>x,y,r,g,b</i>
    <p>The pixels data line should be connected to Pi physical pin 12 - GPIO 18. <i>Note:</i>
    this may conflict with audio playback.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('rpi-neopixels',{
        category: 'Raspberry Pi',
        label: 'Raspberry Pi',
        color:"#c6dbef",
        defaults: {
            name: { value:"" },
            pixels: { value:"", required:true, validate:RED.validators.number() },
            bgnd: { value:"" },
            fgnd: { value:"" },
            wipe: { value:"40", required:true, validate:RED.validators.number() },
            mode: { value:"pcent" }
        },
        inputs:1,
        outputs:0,
        icon: "rpi.png",
        align: "right",
        label: function() {
            return this.name||this.pixels+" neopixels";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>