Add Pi Unicorn Hat node

hardware/unicorn/unicorn.html

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+<!--
+  Copyright 2016 IBM Corp.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+-->
+
+<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.</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>