MaxとArduinoを連携して赤外線センサーで人を検知して音を流したい。

# 人を検知して音楽を再生させたい

今回は、Arduino+赤外線センサーからシリアルとMaxに送信し、
センサーで動くものを検知したら音楽を再生し、人がいなくなってしばらく経過したら、
音楽を止めるというMaxスケッチを作ったのでメモしておく。


# 用意するもの
- Max
- Arduino UNO
- [赤外線センサー](https://www.amazon.co.jp/dp/B081GYJ9CR/ref=cm_sw_r_tw_dp_69C0QRYAXSMJ8DCC1NS9?_encoding=UTF8&psc=1)
- ケーブル３本
- ブレッドボード



## 配線

真ん中が信号線なので、Arduinoのデジタル２番PINに接続(緑色の線)。
あとは、5V(赤色)とGRD(黒色)を接続する。接続はシンプルですね。

※こちらの赤外線センサー、ブレッドボードに真っ直ぐ刺さらなかったので、ペンチで無理やり曲げました。


![IMG_8885.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/152481/85eb8033-57ce-ed14-7cc0-d9a2135112a7.jpeg)


# Arduino
2番ピンにモーションセンサーからの情報が0 - 1でやってくる。
赤外線センサーの信号が来てる時は、13番ピンでLEDが点灯するようにした。

```c
int motionPin = 2;
int motionStatas;
void setup() {
    Serial.begin(9600);
    pinMode(13, OUTPUT);
}

void loop() {
    String message = "";
    motionStatas = digitalRead(motionPin);
    if (motionStatas == 1){
       message = "status 1";
       digitalWrite(13, HIGH);
       
    } else {
       message = "status 0";
       digitalWrite(13, LOW);
    }
    Serial.println(message);

    delay (200);
}

````

# Max 
シリアルを受け取れるようにして、ステータスに応じて、トグルスイッチを再生モードとスタンバイモードにするようにした。最後の検出からの経過時間に応じて、スタンバイモードになるように時間設定できるようにした。

![スクリーンショット 2022-02-26 15.53.02.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/152481/73e8f024-8bb0-e075-a1fc-e7a844c1d9b5.png)









以下をコピーして、Max画面に貼り付けると、今回のスケッチが再現されるはずです。


```Max
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		}
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,
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}

````


# まとめ
赤外線センサーで人を感知して、メディアを再生するというのは、
結構汎用的なので、今後、展示やパフォーマンスとかでも何かに役立ちそうな気がします。