家族で暮らしてると外出先で、子どもがちゃんと家に帰っているか、夕食を何人分用意するか、考えることがあります。
そんなときこのNest Watcherというシステムを作り、実際に使ってみて便利だったので、紹介します。
Nest Watcherは、LINE Botに問い合わせることで、家に誰が居るかわかるシステムです。
ついでに家の中の気温や湿度がどのぐらいか確認できるようにしました！

製作したセンサーキーボックス

LINE Botの画面

家の鍵にRFIDのタグを付け、キーボックスに出し入れする際にRFIDリーダーにタッチすることで誰の鍵が持ち出されたか、入れられたかを検知しています。焦電センサーで、人がいるかいないか

部品

必要な環境

• Arduino IDE 今回使用しているのは、v2.3.3
• enebularのアカウント及びプロジェクト（無料の範囲でOK）
• LINE公式アカウント（無料枠でOK）

設計図

センサーキーボックス配線図

構成図

ソースコード

センサーキーボックス（Arduino）

ボード定義

• Arduino-pico v4.1.1

使用しているライブラリ

• PicowGuidebook v1.1.0
• HX711 Arduino Library v0.7.5
• Grove_Temperature_And_Humidity_Sensor v2.0.2
• MFRC522_I2C v1.0

スケッチ

#include "ConnectWifi.h"
#include <HTTPClient.h>
#include "HX711.h"
#include "DHT.h"
#include "MFRC522_I2C.h"

// クラウド実行環境のパス
#define ENEBULAR_CLOUD_PATH "--- クラウド実行環境のパスを記入 ---"
// センサー値をPOSTするURL
#define SENSOR_POST_URL "https://lcdp002.enebular.com/" ENEBULAR_CLOUD_PATH "/sensor"
// キーの値をPOSTするURL
#define KEY_POST_URL "https://lcdp002.enebular.com/" ENEBULAR_CLOUD_PATH "/key"

// ロードセル用変換回路が接続されているピン
const int HX711_DOUT_PIN = 19;
const int HX711_SCK_PIN = 18;
// 人感センサーが接続されているピン
const int PIR_SENSOR_PIN = 20;
// 温湿度センサDHT20のI2Cピン
const int DHT20_SDA_PIN = 8;
const int DHT20_SCL_PIN = 9;
// RFIDリーダのI2Cピン
const int RFID_SDA_PIN = 6;
const int RFID_SCL_PIN = 7;

// センサー値をPOSTする間隔
const unsigned long interval = 3000000;  

ConnectWifi connect;
HX711 scale;
DHT dht20(DHT20);
MFRC522_I2C *mfrc522;

// 基準の重さ
long baseScale = 0;
// 最後にタッチされたRFID
char lastTouchId[256] = "";
// 最後に処理を実行した時間を記録
unsigned long previousMillis = millis() + interval;

// センサーをクラウドにPOSTする関数
void sensorPost(
  float temperature,
  float humidity
){
  if(connect.isConnected()){
    HTTPClient https;
    https.setInsecure();
    if (https.begin(SENSOR_POST_URL)) {
      https.addHeader("Content-Type", "application/json");
      char body[256];
      sprintf(body,"[");
      sprintf(body+strlen(body),"{\"key\":\"temperature\",\"name\":\"室内気温\",\"value\":%5.1f,\"unit\":\"℃\"},",temperature);
      sprintf(body+strlen(body),"{\"key\":\"humidity\",\"name\":\"室内湿度\",\"value\":%5.1f,\"unit\":\"％\"}",humidity);
      sprintf(body+strlen(body),"]");
      Serial.println(body);
      int status = https.POST(body);
      if (status == 200){
        Serial.println("センサー値POST成功");
      } else {
        Serial.printf("センサー値POST失敗:%d", status);
      }
      https.end();
    }
  }
}

// キーをクラウドにPOSTする関数
void keyPost(
  char* id,
  bool isAtHome
){
  if(connect.isConnected()){
    HTTPClient https;
    https.setInsecure();
    if (https.begin(KEY_POST_URL)) {
      https.addHeader("Content-Type", "application/json");
      char body[256];
      sprintf(body,"{");
      sprintf(body+strlen(body),"\"userId\":\"%s\",\"value\":%s",id,isAtHome ? "true" : "false");
      sprintf(body+strlen(body),"}");
      Serial.println(body);
      int status = https.POST(body);
      if (status == 200){
        Serial.println("キー値POST成功");
      } else {
        Serial.printf("キー値POST失敗:%d", status);
      }
      https.end();
    }
  }
}


void setup() {
  delay(2000);
  // PicoのLEDピンを出力に設定
  pinMode(LED_BUILTIN, OUTPUT);
  // 焦電センサー用のピンを入力に設定
  pinMode(PIR_SENSOR_PIN, INPUT);
  // 重量センサーの初期設定
  scale.begin(HX711_DOUT_PIN, HX711_SCK_PIN);
  // 温湿度センサーDHT20初期化
  Wire.setSDA(DHT20_SDA_PIN);
  Wire.setSCL(DHT20_SCL_PIN);
  Wire.begin();
  dht20.begin();
  // RFIDリーダ初期化
  Wire1.setSDA(RFID_SDA_PIN);
  Wire1.setSCL(RFID_SCL_PIN);
  Wire1.begin();
  mfrc522 = new MFRC522_I2C(0x28,1,&Wire1);
  mfrc522->PCD_Init();
  // Wi-Fiに接続
  connect.begin();
}

void loop() {
  // 現在の経過時間を取得
  unsigned long currentMillis = millis();

  // 定期的にセンサー値をPOST
  if (currentMillis - previousMillis >= interval) {
    // 現在の時間を記録
    previousMillis = currentMillis;             
    // 温度を読み込み
    float temperature = dht20.readTemperature();
    // 湿度を読み込み
    float humidity = dht20.readHumidity();  
    // センサー値をPOST
    sensorPost(temperature,humidity);
  }

  // RFIDリーダーにRFIDがタッチされたらIDを保持する
  if(mfrc522->PICC_IsNewCardPresent() && mfrc522->PICC_ReadCardSerial()) {
    sprintf(lastTouchId, "");
    for (byte i=0; i<mfrc522->uid.size; i++) {
      char tmp[2];
      sprintf(tmp, "%02X", mfrc522->uid.uidByte[i]);
      strcat(lastTouchId, tmp);
    }
    // 重量の基準としてを保持
    baseScale = scale.read();
    // LEDを点灯
    digitalWrite(LED_BUILTIN,HIGH);
  }

  // 重量センサーが正常かつ、RFIDがタッチ済み、人が離れたらPOSTする
  if (scale.is_ready()) {
    bool keyStatus = false;
    static bool pirSensingKeyStatus = false;
    // 重量センサー値を読み込み
    long reading = scale.read();
    // 基準との差分を計算
    long difference = abs(reading - baseScale);
    // 人感センサーの状態を読み込み
    int pirSensor = digitalRead(PIR_SENSOR_PIN);

    if(pirSensor == LOW && strcmp(lastTouchId,"") != 0){
      // POST時に重量センサーが変化していたら在宅、していなかったら外出として扱う
      bool isAtHome = constrain(difference, -2000,2000) != difference;
      // キーのIDと在宅状態をクラウドへPOST
      keyPost(lastTouchId,isAtHome);

      sprintf(lastTouchId, "");
      digitalWrite(LED_BUILTIN,LOW);
    }
  }

  delay(200);
}

クラウド実行環境（enebular）

追加でインストールしたノード

• enebular-privatenode-contrib-ee-connect-v2（基本、enebularのプロジェクト作成時に自動的に追加される）
• enebular-privatenode-contrib-lcdp-toolkit（基本、enebularのプロジェクト作成時に自動的に追加される）
• node-red-contrib-line-messaging-api（パレット管理から追加）

フロー

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フローの変更箇所

• Replyノードのプロパティで、以下を設定して下さい
  • Secret：自分のLINE公式チャンネルのチャネルシークレット
  • Access Token：自分のLINE公式チャンネルのMessaging APIのチャネルアクセストークン

データストアの設定

• テーブル名：任意
• テーブルの種類：カスタム設定
• メインキー名：type
• サブキー：
  • サブキー名：userId
  • データ型：文字列

クラウド実行環境の設定（デフォルトからの変更箇所のみ）

• 名称：任意
• HTTPトリガー：
  • 状態：ON
  • URLのパス：任意の文字列（このURLを自分のLINE公式チャンネルのMessaging APIのWebhook URL及びArduinoスケッチに設定して下さい）
• データストアへの接続：
  • 状態：ON
• 環境変数：
  • キー：TABLE_ID
  • 値：作成したデータストアのID

最後に

しばらく使っていますが、そもそも鍵を取り出す際にRFIDにタッチするのを忘れたりすることもあるので、別な方法で、鍵の個別認識をするべきだと思っています。
案としては、服屋さんとかで使われている商品タグから買い物かご内の商品を認識する方法があると思うので、それと同じ用にキーボックス内にあるタグを認識できるようにしようと考えています。

将来的には、LINE Botからエアコンを付けたり、消し忘れたテレビや暖房を消したりできるようにしたいと思っています。
あと、セキュリティやエラー処理が適当なので、そこら辺も強化したいと思います。