Add % mode to rbe node deadband mode

function/rbe/README.md

@@ -32,4 +32,14 @@ same value. Saves bandwidth, etc...
 In deadband mode the incoming payload should contain a parseable *number* and is
 output only if greater than + or - the *band gap* away from the previous output.
 
-Will accept numbers, or parseable strings like  "18.4 C"  or "$500"
+The deadband value can be specified as a fixed number, or a percentage. E.g. 10
+or 5% . If % mode is used then the output will only get sent if the input payload
+value is equal or more than the specified % away from the previously sent value.
+
+For example - if last sent value was 100, and deadband is set to 10% - a value
+of 110 will pass - then the next value has to be 121 in order to pass (= 110 + 10% = 121).
+
+This is mainly useful if you want to operate across multiple topics at the same
+time that may have widely differing input ranges.
+
+Will only accept numbers, or parseable strings like  "18.4 C"  or "$500"

function/rbe/package.json

@@ -1,6 +1,6 @@
 {
     "name"          : "node-red-node-rbe",
-    "version"       : "0.0.5",
+    "version"       : "0.0.6",
     "description"   : "A Node-RED node that provides report-by-exception (RBE) and deadband capability.",
     "dependencies"  : {
     },

function/rbe/rbe.html

@@ -24,7 +24,7 @@
     </div>
     <div class="form-row" id="node-bandgap">
         <label for="node-input-gap"><i class="fa fa-random"></i> Band gap</label>
-        <input type="text" id="node-input-gap" placeholder="e.g. 10" style="width:71%;">
+        <input type="text" id="node-input-gap" placeholder="e.g. 10 or 5%" style="width:71%;">
     </div>
     <div class="form-row">
         <label for="node-input-name"><i class="fa fa-tag"/> Name</label>
@@ -38,6 +38,7 @@
     different to the previous one. Works on numbers and strings.</p>
     <p>In <b>deadband</b> mode the incoming payload should contain a parseable <i>number</i> and is
     output only if greater than + or - the <i>band gap</i> away from the previous output.</p>
+    <p>Deadband also supports % - only sends if the input differs by more than x% of the original value.</p>
     <p><b>Note:</b> This works on a per <b>msg.topic</b> basis. This means that a single rbe node can
 handle multiple topics at the same time.</p>
 </script>
@@ -49,7 +50,7 @@ handle multiple topics at the same time.</p>
         defaults: {
             name: {value:""},
             func: {value:"rbe"},
-            gap: {value:"",validate:RED.validators.regex(/^(\d*|)$/)}
+            gap: {value:"",validate:RED.validators.regex(/^(\d*|)(%|)$/)}
         },
         inputs:1,
         outputs:1,

function/rbe/rbe.js

@@ -21,6 +21,13 @@ module.exports = function(RED) {
         RED.nodes.createNode(this,n);
         this.func = n.func || "rbe";
         this.gap = n.gap || 0;
+        this.pc = false;
+        if (this.gap.substr(-1) === "%") {
+            this.pc = true;
+            this.gap = parseFloat(this.gap);
+        }
+        console.log(this.gap, this.pc);
+        this.g = this.gap;
         var node = this;
 
         node.previous = {};
@@ -36,6 +43,7 @@ module.exports = function(RED) {
                 else {
                     var n = parseFloat(msg.payload);
                     if (!isNaN(n)) {
+                        if (node.pc) { node.gap = (node.previous[t] * node.g / 100) || 0; }
                         if (!node.previous.hasOwnProperty(t)) { node.previous[t] = n - node.gap; }
                         if (Math.abs(n - node.previous[t]) >= node.gap) {
                             node.previous[t] = n;