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<h1>src/module/HX711.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 HX711_MESSAGE = [0x04, 0x15];
var HX711Event = {
/**
* Fires when the value of weight has changed.
*
* @event HX711.MESSAGE
*/
MESSAGE: 'message'
};
/**
* The HX711 Class.
*
* HX711 is a precision 24-bit analogto-digital converter (ADC) designed for weigh scales.
*
* @namespace webduino.module
* @class HX711
* @constructor
* @param {webduino.Board} board The board that the IRLed is attached to.
* @param {Integer} sckPin The pin that Serial Clock Input is attached to.
* @param {Integer} dtPin The pin that Data Output is attached to.
* @extends webduino.Module
*/
function HX711(board, sckPin, dtPin) {
Module.call(this);
this._board = board;
this._dt = !isNaN(dtPin) ? board.getDigitalPin(dtPin) : dtPin;
this._sck = !isNaN(sckPin) ? board.getDigitalPin(sckPin) : sckPin;
this._init = false;
this._weight = 0;
this._callback = function() {};
this._messageHandler = onMessage.bind(this);
this._board.send([0xf0, 0x04, 0x15, 0x00,
this._sck._number, this._dt._number, 0xf7
]);
}
function onMessage(event) {
var msg = event.message;
if (msg[0] == HX711_MESSAGE[0] && msg[1] == HX711_MESSAGE[1]) {
this.emit(HX711Event.MESSAGE, msg.slice(2));
}
}
HX711.prototype = proto = Object.create(Module.prototype, {
constructor: {
value: HX711
},
/**
* The state indicating whether the module is measuring.
*
* @attribute state
* @type {String} `on` or `off`
*/
state: {
get: function() {
return this._state;
},
set: function(val) {
this._state = val;
}
}
});
/**
* Start detection.
*
* @method measure
* @param {Function} [callback] Callback after starting detection.
*/
/**
* Start detection.
*
* @method on
* @param {Function} [callback] Callback after starting detection.
* @deprecated `on()` is deprecated, use `measure()` instead.
*/
proto.measure = proto.on = function(callback) {
var _this = this;
this._board.send([0xf0, 0x04, 0x15, 0x01, 0xf7]);
if (typeof callback !== 'function') {
callback = function() {};
}
this._callback = function(rawData) {
var weight = '';
for (var i = 0; i < rawData.length; i++) {
weight += (rawData[i] - 0x30);
}
_this._weight = parseFloat(weight);
callback(_this._weight);
};
this._state = 'on';
this._board.on(BoardEvent.SYSEX_MESSAGE, this._messageHandler);
this.addListener(HX711Event.MESSAGE, this._callback);
};
/**
* Stop detection.
*
* @method off
*/
proto.off = function() {
this._state = 'off';
this._board.send([0xf0, 0x04, 0x15, 0x02, 0xf7]);
this._board.removeListener(BoardEvent.SYSEX_MESSAGE, this._messageHandler);
this.removeListener(HX711Event.MESSAGE, this._callback);
this._callback = null;
};
scope.module.HX711 = HX711;
}));
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