使用機器
Bluetooth環境センサー RS-BTEVS1 （ラトックシステム株式会社）
室内の温度や湿度、CO2濃度にPM2.5（1/4/10）も測定できる環境センサーです。
BLEのレシーバーを使用して受信したデータをNode-REDで可視化していきます。
機器の立ち上げ
コンセントにさしてすぐ使用できます。左側のアンテナを立てておきましょう。
MACアドレスはここに記載されています。Node-REDでの実装時に使用します。
計測データの仕様をpdfから引用してきました。
ノードの作成
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hexValue;\n}\n\nmsg.payload = fixdata;\nreturn msg;\n","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":660,"y":320,"wires":[["07adc2c8774ebdaf","b503e2b5aa6395cb","fef74c87faf34edc"]]},{"id":"07adc2c8774ebdaf","type":"debug","z":"23af55b50b4cc44f","name":"Debug3","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":860,"y":320,"wires":[]},{"id":"b503e2b5aa6395cb","type":"function","z":"23af55b50b4cc44f","name":"データ整理","func":"const data = msg.payload;\nconst jsonData = {\n CompanyID: data.substring(0, 4),\n CO2: data.substring(4, 8),\n PMdata: data.substring(8, 16),\n Temperature: data.substring(16,20),\n Humid: data.substr(20)\n};\nmsg.payload = jsonData;\nreturn 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まずは、BLE Beacon ScannarからRS-BTEVS1のMACアドレスでフィルターをかけ、データを絞り込みます。
この時点で、payloadにはデータが格納されておりますが、RS-BTEVS1の仕様書通りに16進数の文字列等（生データ）を作成しています。
生データと可視化データのダッシュボード用ノードです。
CO2・Temperatureは仕様書に従った計算で値を求めています。
ダッシュボードでの表示
ダッシュボード上にはこのように表示され、可視化することができます。