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ESP-WROOM-02でステッピングモータを駆動する

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

ESP-WROOM-02でステッピングモータを駆動する

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

そもそもESP-WROOM-02にはまり込んでいるきっかけは小型のステッピングモータを手に入れたので、これで小型のクローラ駆動の車両をラジコン化してみたいなというのが始まりでした。

どうせならばESP-WROOM-02をArduinoとしても使ってさらに小型化出来るのではということになり、これまではコピペで済ましていたESP-WROOM-02関連を初歩から勉強しなければと思い立ったのは良いのですが、Lチカをやっと卒業してWiFi通信がなんとか出来たところで止まっています。

気分転換に肝心のステッピングモータをESP-WROOM-02で制御するスケッチ開発を試みてみることにしました。

試験回路は実機を想定して以下のようにしました。

これをブレッドボード上に組み上げてみました。

スケッチは前後進を繰り返すという単純なものです。

int x;

void setup() {
pinMode(14,OUTPUT); // Enable 
pinMode(16,OUTPUT); // Step
pinMode(5,OUTPUT); // Dir
pinMode(12,OUTPUT); // Step
pinMode(13,OUTPUT); // Dir

digitalWrite(14,HIGH); // Set Enable low → Low状態でEnable
}

void loop() {
delay(1000);
digitalWrite(14,LOW);
digitalWrite(5,HIGH); // Set Dir High → 回転方向をセット
digitalWrite(13,HIGH); // Set Dir High → 回転方向をセット

for(x = 0; x < 2000; x++) // 括弧内を2000回実行
{
digitalWrite(16,HIGH);
digitalWrite(12,HIGH);
delayMicroseconds(100);
digitalWrite(16,LOW);
digitalWrite(12,LOW);
delayMicroseconds(300);
}
delay(500);

digitalWrite(5,LOW); // Set Dir Low → 回転方向を反対方向へセット
digitalWrite(13,LOW); // Set Dir Low → 回転方向を反対方向へセット
for(x = 0; x < 2000; x++) // 括弧内を2000回実行
{
digitalWrite(16,HIGH);
digitalWrite(12,HIGH);
delayMicroseconds(100);
digitalWrite(16,LOW);
digitalWrite(12,LOW);
delayMicroseconds(300);
}
delay(500);
}

動作のほうは特に問題はないようです。

これでArduinoなしでESP-WROOM02だけでステッピングモータを駆動出来ることは理解できました。後は測距センサの使い勝手を確認する必要がります。

ところで、この試験に使っているESP-WROOM02はスイッチサイエンス社から購入したのですが、読者の方からご教示いただいた方法でフラッシュサイズを調べてみると2MBでした。一方、アリババで購入した中華製は4MBありましたので二つの仕様が混在するとは面倒な話です。

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