Make LEDborg use more clear,

warn if more than one deployed at a time.

hardware/LEDborg/78-ledborg.html

@@ -19,7 +19,8 @@
         <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">See info panel for the various input options.</div>
+    <div class="form-tips">Uses pins 11, 13 aand 15.<br/>
+    See info panel for the various input options and limitations.</div>
 </script>
 
 <script type="text/x-red" data-help-name="ledborg">
@@ -29,6 +30,8 @@
     <p>You can also use the @cheerlight colour names - red, amber, green, blue,
     cyan, magenta, yellow, orange, pink, purple, white, warmwhite, black</p>
     <p>You may also supply a comma separated rrr,ggg,bbb where each value can be between 0 and 255.</p>
+    <p>You can only use one LEDborg node per flow... but you may wire multiple things to it.</p>
+    <p><b>Note</b> : This node uses physical pins 11, 13, and 15. These cannot be used for anything else while this node is in use.</p>
 </script>
 
 <script type="text/javascript">

hardware/LEDborg/78-ledborg.js

@@ -20,6 +20,7 @@ module.exports = function(RED) {
     //var exec = require('child_process').exec;
     var spawn = require('child_process').spawn;
     var fs = require('fs');
+    var LedBorgInUse = false;
 
     var gpioCommand = __dirname+'/nrgpio';
 
@@ -42,6 +43,8 @@ module.exports = function(RED) {
 
     function LedBorgNode(n) {
         RED.nodes.createNode(this,n);
+        if (LedBorgInUse) { this.error("LEDborg node already in use - you may only have one."); }
+        else { LedBorgInUse = true; }
         this.pin = n.pin;
         this.set = n.set || false;
         this.level = n.level || 0;
@@ -120,6 +123,7 @@ module.exports = function(RED) {
         });
 
         node.on("close", function(done) {
+            LedBorgInUse = false;
             node.status({fill:"red",shape:"circle",text:""});
             if (node.child != null) {
                 node.done = done;

hardware/LEDborg/README.md

@@ -1,14 +1,15 @@
 node-red-node-ledborg
 =====================
 
-A <a href="http://nodered.org" target="_new">Node-RED</a> node to control a <a href="https://www.piborg.org/ledborg" target="_new">PiBorg LedBorg</a> baord for a Raspberry Pi.
+A <a href="http://nodered.org" target="_new">Node-RED</a> node to control a <a href="https://www.piborg.org/ledborg" target="_new">PiBorg LedBorg</a> board for a Raspberry Pi.
 
 Install
 -------
 
-Run the following command in the root directory of your Node-RED install
+Run the following command in the root directory of your Node-RED install,
+this is usually `~/.node-red`
 
-    npm install node-red-node-ledborg
+    npm i node-red-node-ledborg
 
 
 Usage
@@ -23,3 +24,11 @@ You can also now use a <b>msg.payload</b> in the standard hex format "#rrggbb".
 ><pre>0x00 - 0x57 = off<br/>0x58 - 0xA7 = 50%<br/>0xA8 - 0xFF = fully on</pre>
 
 You can also use the @cheerlight colour names - red, amber, green, blue, cyan, magenta, yellow, orange, pink, purple, white, warmwhite, black
+
+Notes
+-----
+
+This node can only be used once per flow... as it uses physical pins 11, 13 and 15 on the Pi.
+Using it more than once will cause weird flashing and unpredictable behaviour.
+
+You can of course wire up multiple things in your flow to the same LEDborg node.

hardware/LEDborg/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-ledborg",
-    "version"       : "0.0.9",
+    "version"       : "0.0.10",
     "description"   : "A Node-RED node to control a PiBorg LedBorg board for a Raspberry Pi.",
     "dependencies"  : {
     },