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

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<script type="text/x-red" data-template-name="rpi-unicorn">
<div class="form-row">
    <label for="node-input-png"><i class="fa fa-picture-o"></i> Background</label>
    <input type="text" id="node-input-png" placeholder="8 x 8 pixel png file or rrr,ggg,bbb">
</div>
<div class="form-row">
    <label for="node-input-bright"><i class="fa fa-sun-o"></i> Brightness</label>
    <input type="text" id="node-input-bright" placeholder="0 to 100, default 20" style="width:150px;"> %
</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-unicorn">
    <p>Raspberry Pi Unicorn HAT Node</p>
    <p>The background of the array can be configured using an 8x8 pixel sized
    png image, or by specifying a single colour using an r,g,b triple.</p>
    <p>A pixel is set by <b>msg.payload</b> with a CSV string <i>x,y,r,g,b</i> .
    If x or y are set to * then the complete row or column can be set.</p>
    <p>The background can be set to a colour by setting msg.payload to an r,g,b triple.</p>
    <p>Any msg with a <b>msg.topic</b> identifies a 'sprite' pixel, which can then
    be moved independently. A 'sprite' can be a single pixel or a complete row.</p>
    <p>Setting msg.payload to 0 will delete the sprite from the list.</p>
    <p>Setting msg.payload to "CLS" will clear the display to off and delete any sprites.</p>
    <p>Setting msg.payload to "DEL" will delete any sprites, and leave the background.</p>
    <p>The brightness may be set by setting msg.payload to <i>brightness,nn</i>, where nn is 0 to 100.</p>
    <p>The rotation may be set by setting msg.payload to <i>rotate,rr</i>, where rr is 0, 90, 180 or 270.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('rpi-unicorn',{
        category: 'Raspberry Pi',
        label: 'Raspberry Pi',
        color:"#c6dbef",
        defaults: {
            name: { value:"" },
            png: { value:"" },
            bright: { value:"" }
        },
        inputs:1,
        outputs:0,
        icon: "rpi.png",
        align: "right",
        label: function() {
            return this.name||"unicorn hat";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>