lcd-controller/main.js

Grove-LCD RGB Backlight controller

module.exports = {
    setText: function (msg, pos, clear) {
        if (clear == undefined) {
            clear = true;
        }
        if (clear) {
            LCDqueue.push({func: 'home'});
            LCDqueue.push({func: 'clear'});
        }
        if (pos != undefined) {
            LCDqueue.push({func: 'setCursor', p1: pos.y, p2: pos.x});
        }
        LCDqueue.push({func: 'write', p1: msg});
        LCDqueue.push({func: 'home'});
    },
    clearText: function () {
        LCDqueue.push({func: 'clear'});
    },
    getColor: function () {
        return color;
    },
    setColor: function (r, g, b) {
        toColor = {r:r, g:g, b:b};

        intervalColor = setInterval(function () {
            if ((color.r === toColor.r) && (color.g === toColor.g) && (color.b === toColor.b)) {
                clearInterval(intervalColor);
            } else {
                color.r = (color.r < toColor.r) ? color.r + 2 : color.r - 2;
                color.g = (color.g < toColor.g) ? color.g + 2 : color.g - 2;
                color.b = (color.b < toColor.b) ? color.b + 2 : color.b - 2;
                // catch bounds
                color.r = (color.r < 0) ? 0 : color.r;
                color.g = (color.g < 0) ? 0 : color.g;
                color.b = (color.b < 0) ? 0 : color.b;
                color.r = (color.r > 255) ? 255 : color.r;
                color.g = (color.g > 255) ? 255 : color.g;
                color.b = (color.b > 255) ? 255 : color.b;
            }
            LCD.setColor(color.r * brightness, color.g * brightness, color.b * brightness);
        }, 1);
    },
    brighten: function () {
        var intervalBrightness = setInterval(function () {
            if (brightness >= 1) {
                brightness = 1;
                clearInterval(intervalBrightness);
            }
            else {
                brightness += 0.0025;
            }
            LCD.setColor(color.r * brightness, color.g * brightness, color.b * brightness);
        }, 1);
    },
    dim: function () {
        intervalBrightness = setInterval(function () {
            if (brightness <= 0) {
                brightness = 0;
                clearInterval(intervalBrightness);
            }
            else {
                brightness -= 0.0025;
            }
            LCD.setColor(color.r * brightness, color.g * brightness, color.b * brightness);
        }, 2);
    },
    getBrightness: function () {
        return brightness;
    },
    setBrightness: function (b) {
        brightness = b;
        LCD.setColor(color.r * brightness, color.g * brightness, color.b * brightness);
    }
};

var i2cLCD;
var LCD;

var color = {r: 255, b: 255, g:255};
var toColor = {r: 255, b: 255, g:255};
var brightness = 1;
var intervalBrightness, intervalColor;

var LCDqueue = [];
var LCDqueueRunner = setInterval(function () {
    var command = LCDqueue.shift();
    if (command != undefined) {
        if (command.p1 != undefined && command.p2 != undefined) {
            (LCD[command.func])(command.p1, command.p2);
        } else if (command.p1 != undefined) {
            (LCD[command.func])(command.p1);
        } else {
            (LCD[command.func])();
        }
    }
}, 25);

function init () {
    i2cLCD = require('jsupm_i2clcd');
    LCD = new i2cLCD.Jhd1313m1 (6, 0x3E, 0x62);

    LCD.scroll(false);
    LCD.home();
    LCD.clear();
    LCD.home();
    LCD.write('Starting...');
    LCD.home();
}

init();