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Node-RED MCU EditionでIoTしてみた。

Last updated at 2022-11-13Posted at 2022-10-13

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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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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