completed arduino integration with johnny-five

had to disable a check in johnny-five for it to work (board.js:358)

Author: epochcoder

signal-monitor.js

@@ -1,32 +1,66 @@
 // requires
-var sr = require('./signal-request.js').SignalRetriever;
+var sr = require('./signal-request.js').SignalRetriever,
+    five = require('johnny-five');
 
 // constants
 var INTERVAL = 500,
     URL = 'http://mifi.afrihost.com/api/monitoring/status';
 
 // app variables
-var timeoutId, previousReading;
-
-// main application loop
-timeoutId = setTimeout(function retrieve() {
-  // use our signal retriever module to get the current signal strength
-  sr.retrieve(URL, function(err, signal) {
-    if (err || !signal.SignalStrength) {
-      clearTimeout(timeoutId);
-      console.log(err || 'signal strength not available');
-      return;
-    }
-
-    var strength = parseInt(signal.SignalStrength[0], 10);
-    if (!previousReading || previousReading !== strength) {
-      previousReading = strength; 
-
-      // strength changed, let other modules know
-      console.log(previousReading);
-    }
-
-    // poll again
-    setTimeout(retrieve, INTERVAL);
-  });
-}, INTERVAL);
+var timeoutId, previousReading, board, leds;
+
+// initialize the arduino board
+board = new five.Board({
+  port: "COM12"
+});
+
+// mapping function
+function map(x, minIn, maxIn, minOut, maxOut) {
+  return (x - minIn) * (maxOut - minOut) / (maxIn - minIn) + minOut; 
+}
+
+board.on('ready', function() {
+  // setup the led array (all pwm pins)
+  leds = new five.Led.Array([3, 5, 6, 9, 10]);
+
+  // main application loop
+  timeoutId = setTimeout(function retrieve() {
+    // use our signal retriever module to get the current signal strength
+    sr.retrieve(URL, function(err, signal) {
+      if (err || !signal.SignalStrength) {
+        clearTimeout(timeoutId);
+        console.log(err || 'signal strength not available');
+        return;
+      }
+
+      var strength = parseInt(signal.SignalStrength[0], 10), ledStrength;
+
+      if (!previousReading || previousReading !== strength) {
+        previousReading = strength; 
+        
+        // switch correct leds on/off
+        ledStrength = map(previousReading, 0, 100, 1, leds.length);
+
+        // log new strength
+        console.log('1. reading:' + previousReading + ', mapped:' + ledStrength);
+
+        // switch on/off any leds
+        leds.each(function(led, i) {
+          led[(i + 1) < ledStrength ? 'on' : 'off'].call(this);
+        });
+
+        // now show fractional strength
+        var rounded = Math.floor(ledStrength), 
+            fraction = ledStrength - rounded,
+            mapped = Math.floor(map(fraction, 0, 1, 1, 255));
+         
+        // log and set   
+        console.log('2. rounded: ' + rounded + ', fraction: ' + fraction + ', mapped:' + mapped);
+        leds[rounded].brightness(mapped);
+      }
+
+      // poll again
+      setTimeout(retrieve, INTERVAL);
+    });
+  }, INTERVAL);
+});