public function show($daysAgo)
{
$date = new Carbon\Carbon();
$date->subDays($daysAgo);
$sensors = Sensor::findMany(Data::where('timestamp', '>', $date->toDateTimeString())->distinct('sensor_id')->get(array('sensor_id'))->toArray());
$timestamps = Data::where('timestamp', '>', $date->toDateTimeString())->distinct('timestamp')->get(array('timestamp'));
return View::make("showGraph", ["daysAgo" => $daysAgo, "sensors" => $sensors, "timestamps" => $timestamps]);
}