chameleon lamp

var linino = require('ideino-linino-lib'),

    board = new linino.Board();

var lifx = require('lifx');

var lx = lifx.init();

// Define colour sensor LED pins

var ledArray = [2, 3, 4];

// boolean to know if the balance has been set

var balanceSet = false;

//place holders for colour detected

var red = 0;

var green = 0;

var blue = 0;

//floats to hold colour arrays

var colourArray = [0, 0, 0];

var whiteArray = [0, 0, 0];

var blackArray = [0, 0, 0];

//place holder for average

var avgRead;

//delay

function sleep(time, callback) {

    var stop = new Date().getTime();

    while (new Date().getTime() < stop + time) {;

    }

    callback();

}

//convert RGB to HSV

function rgb2hsv(r, g, b) {

    r /= 255, g /= 255, b /= 255;

    var rr, gg, bb,

        h, s,

        v = Math.max(r, g, b),

        diff = v - Math.min(r, g, b),

        diffc = function (c) {

            return (v - c) / 6 / diff + 1 / 2;

        };

    if (diff == 0) {

        h = s = 0;

    } else {

        s = diff / v;

        rr = diffc(r);

        gg = diffc(g);

        bb = diffc(b);

        if (r === v) {

            h = bb - gg;

        } else if (g === v) {

            h = (1 / 3) + rr - bb;

        } else if (b === v) {

            h = (2 / 3) + gg - rr;

        }

        if (h < 0) {

            h += 1;

        } else if (h > 1) {

            h -= 1;

        }

    }

    return [h, s, v];

}

board.connect(function () {

    //setup the outputs for the colour sensor

    board.pinMode("D2", "OUTPUT");

    board.pinMode("D3", "OUTPUT");

    board.pinMode("D4", "OUTPUT");

    lx.lightsOn();

    setInterval(function () {

        checkBalance();

        checkColour();

        printColour();

    }, 1000);

    function checkBalance() {

        //check if the balance has been set, if not, set it

        if (balanceSet === false) {

            setBalance();

        }

    }

    function setBalance() {

        //set white balance

        sleep(5000, function () {});

        //delay for five seconds, this gives us time to get a white sample in front of our sensor

        //scan the white sample.

        //go through each light, get a reading, set the base reading for each colour red, green, and blue to the white array

        for (var i = 0; i <= 2; i++) {

            board.digitalWrite("D" + ledArray[i].toString(), 1);

            sleep(100, function () {});

            getReading(5); //number is the number of scans to take for average, this whole function is redundant, one reading works just as well.

            whiteArray[i] = avgRead;

            board.digitalWrite("D" + ledArray[i].toString(), 0);

            sleep(100, function () {});

        }

        sleep(5000, function () {});

        //done scanning white, now it will pulse blue to tell you that it is time for the black (or grey) sample.

        //set black balance

        //wait for five seconds so we can position our black sample

        //go ahead and scan, sets the colour values for red, green, and blue when exposed to black

        for (var j = 0; j <= 2; j++) {

            board.digitalWrite("D" + ledArray[j].toString(), 1);

            sleep(100, function () {});

            getReading(5);

            blackArray[j] = avgRead;

            //blackArray[i] = analogRead(2);

            board.digitalWrite("D" + ledArray[j].toString(), 0);

            sleep(100, function () {});

        }

        //set boolean value so we know that balance is set

        balanceSet = true;

        sleep(5000, function () {});

        //delay another 5 seconds to allow the human to catch up to what is going on

    }

    function checkColour() {

        for (var i = 0; i <= 2; i++) {

            board.digitalWrite("D" + ledArray[i].toString(), 1); //turn or the LED, red, green or blue depending which iteration

            sleep(100, function () {});

            getReading(5); //take a reading however many times

            colourArray[i] = avgRead; //set the current colour in the array to the average reading

            var greyDiff = whiteArray[i] - blackArray[i]; //the highest possible return minus the lowest returns the area for values in between

            colourArray[i] = (colourArray[i] - blackArray[i]) / (greyDiff) * 255; //the reading returned minus the lowest value divided by the possible range multiplied by 255 will give us a value roughly between 0-255 representing the value for the current reflectivity(for the colour it is exposed to) of what is being scanned

            board.digitalWrite("D" + ledArray[i].toString(), 0); //turn off the current LED

            sleep(100, function () {});

        }

    }

    function getReading(times) {

        var reading;

        var tally = 0;

        //take the reading however many times was requested and add them up

        for (var i = 0; i < times; i++) {

            reading = board.analogRead("A0");

            tally = reading + tally;

            sleep(100, function () {});

        }

        //calculate the average and set it

        avgRead = (tally) / times;

    }

    //prints the colour in the colour array, in the next step, we will send this to processing to see how good the sensor works.

    function printColour() {

        var r, g, b;

        if (colourArray[0] > 255) r = 255

        else if (colourArray[0] < 0) r = 0

        else r = parseInt(colourArray[0])

        if (colourArray[1] > 255) g = 255

        else if (colourArray[1] < 0) g = 0

        else g = parseInt(colourArray[1])

        if (colourArray[2] > 255) b = 255

        else if (colourArray[2] < 0) b = 0

        else b = parseInt(colourArray[2])

        console.log("R = " + r);

        console.log("G = " + g);

        console.log("B = " + b);

        var clr = rgb2hsv(r, g, b);

        var h = (parseInt(clr[0] * 65535));

        var s = (parseInt(clr[1] * 65535));

        var b = (parseInt(clr[2] * 65535));

        console.log("H = " + h);

        console.log("S = " + s);

        console.log("B = " + b);

        lx.lightsColour(h, s, l, 0x0dac, 0);

    }

});