■明るさや気圧も表示

　SensorTAGはたくさんのセンサを搭載したデモ・モジュールです。温度や湿度以外に、簡単にデータを取り出せる明るさと気圧も追加します。追加すると、dashboardによるビジュアルな表示が縦方向に伸びていき、見やすくなくなります。後半では、表示方法に工夫をします。

●明るさセンサ

　前回と同様に、湿度もしくは温度のfunctionをコピーし、そのプログラムを書き換えます。

if (msg.topic === 'sensorTag/luxometer') {
 msg.payload = msg.payload.lux;
 return msg;
} else {
 return null;
}

●気圧センサ

if (msg.topic === 'sensorTag/pressure') {
 msg.payload = msg.payload.pressure;
 return msg;
} else {
 return null;
}

　新しいfunctionは、sensorTagとそれぞれ線で結びます。dashboardも適切なものを選びます。その結果を次に示します。

　なんだか縦に表示が伸びて、見やすくないですね。

●2段組みにして見やすく

　dashboardは細かくHTMLやCSSで制御できません。2段（2列）で表示するには、グループ化します。この画面は、node-RED0.17.3です。

　画面右にあるdashboardのタブにHome01を表示し、「+tab」をクリックすると2番目のグループができます。

　明るさのdashboardノードをダブルクリックし、Groupの項目で、「私の部屋[Home01]」から「Group2[Home01]」に変更します。

　気圧のdashboardも同様にGroup2に変更すると、次のように表示が2列になります。

※各センサの表示に使っているdashboardの形状は、その値を表示するのに適切かどうかはあまり考慮していません。また単位に間違いがあるかもしれません。

　ここまでのプログラムを次に示します。利用の方法は前回を参照してください。

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