Node-RED MCU EditionでIoTしてみた。

はじめに

Node-RED MCU Editionの環境構築、簡単なフロー、Lチカ、ネットワーク接続(HTTP, MQTT)まで終わったので、組み合わせと連動(IoT)を試してみます。

環境構築と動作確認については以下を参照してください。

GPIOの動作確認については以下を参照してください。

ネットワーク接続(HTTP, MQTT)については以下を参照してください。

前提条件

• Intel MacBook Pro (2017)
• macOS Big Sur (バージョン 11.7)
• M5Stick-C
  • LED(GPIO10)
• HTTPサーバ、ダッシュボード (Node-RED, Dashboard)
• MQTTサーバ (Aedes MQTT broker)

構成

クラウド上のNode-REDでダッシュボードを作成し、スマートフォンからアクセスします。
ダッシュボード上の「ON」または「OFF」のボタンを押すとNode-REDのMQTT Broker経由でM5Stick-Cにデータが届きます。
データの内容に応じてM5Stick-CのLEDが点灯または消灯します。

Node-REDフローを作成する (HTTPサーバ, MQTTサーバ)

ダッシュボードとMQTTサーバはノードの追加が必要になります。
右上のメニューから「パレットの管理」→「ノードを追加」タブを選択します。
「ノードを検索」のフォーム入力から以下のノードを入力し、「ノードを追加」ボタンを押します。
ポップアップメッセージが表示されますので、「追加」を選択します。

• node-red-dashboard
• node-red-contrib-aedes

ノードの追加が終わったあと、以下のフローを作成します。
MQTTで送受信するデータは、Node-RED MCU Editionがサポートしているデータタイプに制限があるため、JSONフォーマットを使用します。

(サンプルフロー)

flows.json

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endpoint\"}","tot":"json"}],"action":"","property":"","from":"","to":"","reg":false,"x":460,"y":60,"wires":[["77a70795471228f6"]]},{"id":"77a70795471228f6","type":"http response","z":"f2cdbff0e8dc76fd","name":"","statusCode":"","headers":{},"x":650,"y":60,"wires":[]},{"id":"7b415c82f15e924c","type":"debug","z":"f2cdbff0e8dc76fd","name":"debug 2","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":440,"y":100,"wires":[]},{"id":"db538d38c6f04527","type":"aedes broker","z":"f2cdbff0e8dc76fd","name":"","mqtt_port":1883,"mqtt_ws_bind":"port","mqtt_ws_port":null,"mqtt_ws_path":"","cert":"","key":"","certname":"","keyname":"","dburl":"","usetls":false,"x":250,"y":260,"wires":[["f3c22c6272ac56da"],["a3238c0710b0a66a"]]},{"id":"f3c22c6272ac56da","type":"debug","z":"f2cdbff0e8dc76fd","name":"debug 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out","z":"f2cdbff0e8dc76fd","name":"","topic":"/test","qos":"","retain":"","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"61e4e665807b8674","x":530,"y":520,"wires":[]},{"id":"6859c48a64c86d84","type":"inject","z":"f2cdbff0e8dc76fd","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":320,"y":460,"wires":[["b1413c150ea3a010"]]},{"id":"276f14da304fe886","type":"debug","z":"f2cdbff0e8dc76fd","name":"debug 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スマートフォンからアクセスするダッシュボード画面は以下のようになります。

Node-REDフローを作成する (Node-RED MCU Edition)

以下のフローを作成します。
(「inject」ノードと「delay」ノードと「change」ノードのフロー部分は動作確認の目的です)

(サンプルフロー)

flows.json

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「mqtt in」ノード

• サーバ → 編集ボタン(鉛筆マーク)を押して、MQTTサーバ(Aedes MQTT broker)のホスト名とポート番号を入力します
• トピック → /testを入力します (MQTTサーバのトピックと合わせます)
• 出力 → JSONオブジェクトを選択します

「change」ノード

• 値の代入 → msg.payloadを入力します。
• 対象の値 → msg.payload.dataを入力します。

「rpi - gpio out」ノード

• BCM GPIO → 10を入力します
• 出力形式 → デジタル出力を選択します
• 端子の状態を初期化 → チェックボックスにチェックを入れます
• 名前 → LEDと入力します

M5Stick-Cへインストールする

以下のページの手順とおりです。

• M5Stick-Cへインストールする
  • node-red-mcu-pluginを使用する場合
  • Node-RED MCU Editionを使用する場合

動作確認

スマートフォンからNode-REDのダッシュボードにアクセスし、「ON」または「OFF」ボタンを押すと、M5Stick-CのLEDが点灯または消灯することを確認します。