PanasonicのドアベルVL-MWD501が鳴ったときにslackに通知します。slackはincoming webhookで投稿します。参考: https://qiita.com/yomori/items/ca213f1087c2a0e270e1#%E3%83%89%E3%82%A2%E3%83%9B%E3%83%B3%E3%81%8C%E9%B3%B4%E3%81%A3%E3%81%9F%E3%82%89googlehomeslackdiscord%E3%81%AB%E9%80%9A%E7%9F%A5%E3%81%99%E3%82%8B

m5stickc_doorbell_panasonic

#include <M5StickC.h>
#include <WiFi.h>
#include <ssl_client.h>
#include <HTTPClient.h>

#define PIN_SW 26

const char* ssid = "ssid";
const char* password = "pass";
const char* WEBHOOK_URL = "url";
bool is_calling = false;
int ncTimer = 0;

void setup() {
    M5.begin();
    M5.Lcd.setRotation(1);
    Serial.begin(115200);

    // 画面の輝度を下げる
    M5.Axp.ScreenBreath(8);
    // CPUの動作周波数を80MHzに設定 (80MHz未満ではWi-Fi使用不可)
    setCpuFrequencyMhz(80);

    delay(100);

    // 無線LANへ接続
    Serial.println("Connecting to ");
    Serial.print(ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("\nWiFi Connected.");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());

    pinMode(PIN_SW,INPUT_PULLUP);
}

void loop() {
  static int swBefore=1;
  bool sw = digitalRead(PIN_SW);
  Serial.println(sw);
  if( sw != swBefore && !is_calling){
    postMessage("来客です。");
    is_calling = true;
  }
  if (sw == swBefore) {
    is_calling = false;
  }

  if (WiFi.status() != WL_CONNECTED){
    ncTimer++;
    if (ncTimer > 60){
      ESP.restart();
    }
    delay(1000);
  }
  else{
    ncTimer = 0;
  }
  delay(10);
}

void postMessage(const char* message) {
    HTTPClient http;
    if (http.begin(WEBHOOK_URL))
    {
      String payload = String("{'text':'") + message + "'}"; //INPUT your original message
      int httpCode = http.POST(payload);
    }
}