Version 0.9.1

function getHistory() {
	var url = 'ajax/get_history.php',
		data = {},
		ajax = {url: url, data: data, dataType: "json", complete: function (r) { writeGraph(r); }};

	$.ajax(ajax);
}

function ts2date(ts) {
	var date = new Date(ts*1000),
		year = date.getFullYear(),
		month = "0" + date.getMonth(),
		day = "0" + date.getDate();

	return year + '-' + month.substr(-2) + '-' + day.substr(-2);
}

function ts2datetime(ts) {
	var date = new Date(ts*1000),
		year = date.getFullYear(),
		month = "0" + date.getMonth(),
		day = "0" + date.getDate(),
		hours = "0" + date.getHours(),
		minutes = "0" + date.getMinutes(),
		seconds = "0" + date.getSeconds();

	return year + '-' + month.substr(-2) + '-' + day.substr(-2) + ' ' + hours.substr(-2) + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);
}

function prepareData(d) {
	var o = [], ot = {}, s, step = 300, last, v, ar, now = Math.round((+ new Date())/1000);
	
	$(d).each(function () {
		ot.name = this.name;
		ot.zwave_id = this.zwave_id;
		ot.type = this.type;
		ot.id = this.id;
		ot.data = [];
		
		if(this.data.length == 0 || this.data.length == 1) return -1;
		ot.date = ts2date(this.data[0].ts);
		
		v = (isNaN(this.data[0].value))? this.data[0].value.replace('off',0).replace('on',1) : this.data[0].value;
		s = this.data[0].ts;
		last = v;
		ar = [ts2datetime(s),v];
		ot.data.push(ar);
		
		$(this.data).each(function () {
			v = (isNaN(this.value))? this.value.replace('off',0).replace('on',1) : this.value;
			ar = [ts2datetime(s),v];
			while(this.ts > (s + step)) {
				ot.data.push([ts2datetime(s),last]);
				s += step;
			}
			
			s = this.ts;
			last = v;
			ot.data.push(ar);
		});
		
		while(s < now) {
			s += step;
			ot.data.push([ts2datetime(s),last]);
		}
		o.push(jQuery.extend(true, {}, ot));
	});
	console.log(o);
	
	return o;
}

function writeGraph(d) {
	var names = [];
	
	d = d.responseJSON.data;
	r = d;
	
	var data = prepareData(d);
	x = data;
	
	$(data).each(function () {
		
		if(this.data.length > 0) {	
			$('<div id="'+ this.zwave_id +'">').appendTo('#charts');
			
			$.jqplot(this.zwave_id, [this.data], {
			  title: this.name +' ('+ this.date +')', 
			  title: this.name, 
			  axes:{
				xaxis:{
				  renderer:$.jqplot.DateAxisRenderer,
				  tickOptions:{formatString:'%H:%M'},
				  tickInterval:'1 hour'
				}
			  },
			  seriesDefaults: { 
				showMarker:false,
				pointLabels: { show:true } 
			  }
			});
		}
	});
}

$(function(){
	
	getHistory();
	
});