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ESP-WROOM-02をArduinoとして使う・Lチカまで

https://blog.with2.net/link/?1965529

ESP-WROOM-02をArduinoとして使う・Lチカまで

https://blog.with2.net/link/?1965529

次回製作しようとしている作品のコンセプトはクローラをステッピングモータで駆動する車両をWiFi経由で遠隔制御すると同時に測距センサを組み込んで衝突回避を自動で行おうというものです。

ESP-WROOM-02は単体でマイコンとして動作し、GPIOやPWM出力、I2C接続等もできるそうです。しかもArduino IDEで開発できるためこれまでArduinoで試していたノウハウを活かすことができることが最大の利点です。さらに本来のWi-Fi制御も出来るので手持ちのスマホをコントローラにすることができそうです。

ESP-WROOM-02をArduinoとして利用するには、Arduinoの開発環境であるIDEにESP-WROOM-02のボードを追加する必要があります。下記の手順に沿ってESP-WROOM-02をArduinoに追加します。

1. Arduino IDEを起動する

2. 「ファイル」-「環境設定」を開く

3. 「環境設定」の中にあるAdditional Boards Manager URLs:に下記のURLを入力

入力するURL:http://arduino.esp8266.com/stable/package_esp8266com_index.json
配布元:https://github.com/esp8266/Arduino

これは、ボード情報が記載されているURLを入力することで、Arduinoに新しいボードを手軽に追加できる管理マネージャー機能です。

4. 次に「環境設定」画面右下「OK」を押して一旦閉じます。次に、「ツール」から「マイコンボード」-「ボードマネージャー」を選択して検索欄に「ESP82」と入力すると、ESP8266~と表示されるので「インストール」します。しばらくするとインストールが完了すればArduinoを一度再起動して、再度「ツール」-「ボード」を開くとESP8266関連のボード一式が追加されていれば追加は完了です。

Arduino側の準備が完了したので、ESP-WROOM02にスケッチを書き込んでみます。いつものLチカを試みてみます。2ピンにLEDを抵抗を介して接続してみます。

ところでESP-WROOM02のピン配置はどうなっているのかが気になりますので調べてみました。

出典 https://ht-deko.com/arduino/esp-wroom-02.html

開発コンセプトのステッピングモータ2台すなわちドライバ2個と測距センサ1個を制御するには、測距センサのアナログ入力をどうしたらよいのかが不安ですが、その他はなんとか足りそうな雰囲気です。

さて、先ほどのスケッチをESP-WROOM02に書き込んでみます。IO0をケーブルを差し替えてGNDに接続、すなわちLOW状態にして、RSTポートをこれもケーブルでGNDに接続してリセットした後に、書き込んでみます。

無事に書き込み完了のお知らせがきました。USBケーブルを抜いてIO0のケーブルを元に戻してHIGHとして、再度USBケーブルを接続すれば動画のようにLチカ完成です。

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