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ESP-WROOM-02とジョイスティック

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

ESP-WROOM-02とジョイスティック

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

さて、前記事につづいてクローラ駆動車両の前後進、左右旋回をジョイスティックで制御してみようという試みです。

ESP-WROOM-02ではアナログ入力がTOUT一か所のみなので、ジョイスティックのアナログ信号をAD変換してみようというものです。

自身にとっては初めてのアイテムですが、ネット情報を頼りにMCP3002というAD変換チップを秋月より入手、早速ブレッドボード上に回路を組んで試験をしてみました。案ずるより易しで難なくクリアー、出来上がった回路が以下です。

これでESP-WROOM-02のポートはすべて使い切ったことになります。

試験回路です。

赤丸内がMCP3002です

試験の様子です。うまく動作しているように見えます。

ただ、中立状態で放置していると時々クローラが回転することがあります。シリアルモニターの数値には、その時には不明な数値が現れています。なにかの外乱のようです。このままでも致命傷ではないのでそのままにしておこうかと思っています。

さて、この後はジョイスティック部分を分離してWiFiにてジョイスティックの数値を送信して車両を遠隔制御しようということに当然なるわけで、またしばらく楽しめそうです。

ところで動画の右端に映っているピンクの箱ですが、電源ボックスです。

これまで、いつショートさせるかとひやひやモノでしたので、箱を新調しました。ついでにESP-WROOM-02で必要な3.3V、いつも使っている電池電源の7.4Vとよく使う5V を供給できるようにしました。

便利ですよ

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