sensors.js

gistfile1.txt

var plotly = require('plotly')('streaming-demos','3yyglqsi85');
var five = require("johnny-five");
var board = new five.Board();
var EventEmitter = require('events').EventEmitter;

// plotly init data
var data = [
  {x:[], y:[], stream:{token:'8xdfnkq1nb', maxpoints:210}, name: 'Device 1'},
  {x:[], y:[], stream:{token:'xtndiqvpol', maxpoints:200}, name : 'Device 2'}];

var layout = {
 fileopt : "overwrite",
 layout: {
    xaxis : {
      showline : false,
      zeroline : false,
      ticks : ""
    },
    yaxis : {
       autorange : false,
       range : [-1,1],
      showline : false,
      zeroline : false,
      ticks : ""
     },
    legend : {
      x : 0,
      y : 1,
      bgcolor : 'rgba(189,189,189,0.2)',
      bordercolor : "#FFFFFF",
      borderwidth : 2,
      traceorder : "normal",
      font : {
        color : "#000",
        family : "Open Sans",
        size : 14,
      }
    },
    filename : "nodey arduino demo!"
  }
};

// lets do this
board.on("ready", function () {

  var photoresistor = new five.Sensor({ pin: "A0", freq: 50, threshold: 100 });
  var potentiometer = new five.Sensor({ pin: "A5", freq: 50, threshold: 100 });

  var sinner = SinBox();

  plotly.plot(data,layout,function (err, res) {
    if (err) console.log(err);
    console.log(res);

    var stream = plotly.stream('8xdfnkq1nb', function (err, res) {
      if (err) console.log(err);
      console.log(res);
    });

    potentiometer.scale([ 0, 4000 ]).on("data", function () {
      var freq = this.value/1000;
      sinner.setFrequency(freq);
    });

    photoresistor.scale([ 0, 1 ]).on("data", function () {
      sinner.setAmplitude(this.value);
    });

    sinner.on('data', function (data) {
        //console.log(data);
        stream.write(JSON.stringify(data)+'\n');
    });
  });
});

// little helper function to get a nicely formatted date string
function getDateString () {
  var time = new Date();
  var datestr = new Date(time - 14400000).toISOString().replace(/T/, ' ').replace(/Z/, '');
  return datestr;
}

function SinBox () {
    var self = new EventEmitter();

    self.freq = 0; // should be between 200ms and 4 seconds?
    self.amp = 0;  // should be between 0 and 1

    self.start = Date.now();
    self.switcher = 0;

    self.setAmplitude = function (amp) {
        self.amp = amp;
        self.switcher = !self.switcher;
        if (self.switcher)
            self.computeSignal();
    };

    self.setFrequency = function (freq) {
        self.freq = freq;
        self.switcher = !self.switcher;
        if (self.switcher)
            self.computeSignal();
    };

    self.computeSignal = function () {
        var now = Date.now();
        var ts = (now - self.start) / 1000;
        var x = new Date(now - 14400000).toISOString().replace(/T/, ' ').replace(/Z/, '');
        var y = self.amp * Math.sin(self.freq * ts);


        self.emit('data', {x:x, y:y} );
    };

    return self;

}