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<title>src/module/Dht.js - webduino-js</title>
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<h1>src/module/Dht.js <small>File</small></h1>
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<pre class="prettyprint linenums">
+(function (global, factory) {
if (typeof exports === 'undefined') {
factory(global.webduino || {});
} else {
module.exports = factory;
}
}(this, function (scope) {
'use strict';
var Module = scope.Module,
BoardEvent = scope.BoardEvent,
proto;
var DHT_MESSAGE = [0x04, 0x04],
MIN_READ_INTERVAL = 1000,
MIN_RESPONSE_TIME = 30,
RETRY_INTERVAL = 6000;
var DhtEvent = {
/**
* Fires when reading value.
*
* @event DhtEvent.READ
*/
READ: 'read',
/**
* Fires when error occured while reading value.
*
* @event DhtEvent.READ_ERROR
*/
READ_ERROR: 'readError'
};
/**
* The Dht Class.
*
* DHT is sensor for measuring temperature and humidity.
*
* @namespace webduino.module
* @class Dht
* @constructor
* @param {webduino.Board} board The board that the DHT is attached to.
* @param {Integer} pin The pin that the DHT is connected to.
* @extends webduino.Module
*/
function Dht(board, pin) {
Module.call(this);
this._type = 'DHT11';
this._board = board;
this._pin = pin;
this._humidity = null;
this._temperature = null;
this._lastRecv = null;
this._readTimer = null;
this._readCallback = function () {};
this._board.on(BoardEvent.BEFOREDISCONNECT, this.stopRead.bind(this));
this._messageHandler = onMessage.bind(this);
this._board.on(BoardEvent.ERROR, this.stopRead.bind(this));
}
function onMessage(event) {
var message = event.message;
if (message[0] !== DHT_MESSAGE[0] || message[1] !== DHT_MESSAGE[1]) {
return;
} else {
processDhtData(this, message);
}
}
function processDhtData(self, data) {
var str = '',
i = 3,
MAX = 4,
dd = [],
d1, d2;
if (data[2] === self._pin.number) {
while (i < data.length) {
d1 = data[i];
d2 = data[i + 1];
str += (d1 - 48);
d2 && (str += (d2 - 48));
i += 2;
if ((i - 3) % MAX === 0) {
dd.push(parseInt(str) / 100);
str = '';
}
}
self._lastRecv = Date.now();
self.emit(DhtEvent.READ, dd[0], dd[1]);
}
}
Dht.prototype = proto = Object.create(Module.prototype, {
constructor: {
value: Dht
},
/**
* Return the humidity.
*
* @attribute humidity
* @type {Number} humidity
* @readOnly
*/
humidity: {
get: function () {
return this._humidity;
}
},
/**
* Return the temperature.
*
* @attribute temperature
* @type {Number} temperature
* @readOnly
*/
temperature: {
get: function () {
return this._temperature;
}
}
});
/**
* Start reading data from sensor.
*
* @method read
* @param {Function} [callback] reading callback.
* @param {Integer} interval reading interval.
* @param {Object} callback.data returned data from sensor,
* humidity and temperature will be passed into callback function as parameters.
*
* callback()
*
* will be transformed to
*
* callback({humidity: humidity, temperature: temperature})
*
* automatically.
*/
proto.read = function (callback, interval) {
var self = this,
timer;
self.stopRead();
if (typeof callback === 'function') {
self._readCallback = function (humidity, temperature) {
self._humidity = humidity;
self._temperature = temperature;
callback({
humidity: humidity,
temperature: temperature
});
};
self._board.on(BoardEvent.SYSEX_MESSAGE, self._messageHandler);
self.on(DhtEvent.READ, self._readCallback);
timer = function () {
self._board.sendSysex(DHT_MESSAGE[0], [DHT_MESSAGE[1], self._pin.number]);
if (interval) {
interval = Math.max(interval, MIN_READ_INTERVAL);
if (self._lastRecv === null || Date.now() - self._lastRecv < 5 * interval) {
self._readTimer = setTimeout(timer, interval);
} else {
self.stopRead();
setTimeout(function () {
self.read(callback, interval);
}, RETRY_INTERVAL);
}
}
};
timer();
} else {
return new Promise(function (resolve) {
self.read(function (data) {
self._humidity = data.humidity;
self._temperature = data.temperature;
setTimeout(function () {
resolve(data);
}, MIN_RESPONSE_TIME);
});
});
}
};
/**
* Stop reading value from sensor.
*
* @method stopRead
*/
proto.stopRead = function () {
this.removeListener(DhtEvent.READ, this._readCallback);
this._board.removeListener(BoardEvent.SYSEX_MESSAGE, this._messageHandler);
this._lastRecv = null;
if (this._readTimer) {
clearTimeout(this._readTimer);
delete this._readTimer;
}
};
scope.module.DhtEvent = DhtEvent;
scope.module.Dht = Dht;
}));
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