ESP32 DHT22 + Telegram 每 3 秒檢查一次溫濕度 只有變化才發送至 Telegram 支援 /status 指令回報目前溫濕度

 ESP32 DHT22 + Telegram   

1. 每 3 秒檢查一次溫濕度

2. 只有變化才發送至 Telegram

3. 支援 /status 指令回報目前溫濕度

//每 3 秒檢查一次溫濕度

//只有變化才發送至 Telegram

//支援 /status 指令回報目前溫濕度

#include <WiFi.h>

#include <WiFiClientSecure.h>

#include <UniversalTelegramBot.h>

#include <DHT.h>

// WiFi 資訊

const char* ssid = "Wokwi-GUEST";

const char* password = "";

// Telegram Bot 資訊

// Initialize Telegram BOT

#define BOT_TOKEN "8023906815:AAE0KApbm5Ng00VCvO57JWA_XKtbx6a4IXM"  

// your Bot Token (Get from Botfather)

// Use @myidbot to find out the chat ID of an individual or a group

// Also note that you need to click "start" on a bot before it can

// message you

#define CHAT_ID "7965218469"

// DHT 感測器設定

#define DHTPIN 15

#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

// Telegram 設定

WiFiClientSecure secured_client;

UniversalTelegramBot bot(BOT_TOKEN, secured_client);

// 計時器

unsigned long lastSendTime = 0;

const unsigned long sendInterval = 3000;

unsigned long lastBotCheck = 0;

const unsigned long botCheckInterval = 1000;

// 儲存前次溫濕度

float lastTemp = NAN;

float lastHum = NAN;

void setup() {

  Serial.begin(115200);

  dht.begin();

  // WiFi 連線

  WiFi.begin(ssid, password);

  Serial.print("連線中");

  while (WiFi.status() != WL_CONNECTED) {

    delay(500);

    Serial.print(".");

  }

  Serial.println("\nWiFi 已連線");

  Serial.println(WiFi.localIP());

  // Telegram HTTPS 憑證略過

  secured_client.setInsecure();

  // 開機訊息

  Serial.println("\nESP32 開機完成，監測啟動。");

  bot.sendMessage(CHAT_ID, "ESP32 開機完成，監測啟動。", "");

}

void loop() {

  unsigned long now = millis();

  // 1. 檢查溫濕度變化

  if (now - lastSendTime >= sendInterval) {

    lastSendTime = now;

    float t = dht.readTemperature();

    float h = dht.readHumidity();

    if (isnan(t) || isnan(h)) {

      Serial.println("讀取 DHT22 失敗");

      return;

    }

    if (t != lastTemp || h != lastHum) {

      lastTemp = t;

      lastHum = h;

      String msg = "溫濕度變化：\n";

      msg += "溫度：" + String(t, 1) + " °C\n";

      msg += "濕度：" + String(h, 1) + " %";

      Serial.println("變化 -> 傳送");

      bot.sendMessage(CHAT_ID, msg, "");

    }

  }

  // 2. 檢查是否有 Telegram 指令

  if (now - lastBotCheck > botCheckInterval) {

    int numNewMessages = bot.getUpdates(bot.last_message_received + 1);

    while (numNewMessages) {

      for (int i = 0; i < numNewMessages; i++) {

        String text = bot.messages[i].text;

        String chat_id = bot.messages[i].chat_id;

        if (text == "/status") {

          float t = dht.readTemperature();

          float h = dht.readHumidity();

          if (isnan(t) || isnan(h)) {

            bot.sendMessage(chat_id, "讀取感測器失敗", "");

          } else {

            String msg = "目前環境數據：\n";

            msg += "溫度：" + String(t, 1) + " °C\n";

            msg += "濕度：" + String(h, 1) + " %";

            bot.sendMessage(chat_id, msg, "");

          }

        }

      }

      numNewMessages = bot.getUpdates(bot.last_message_received + 1);

    }

    lastBotCheck = now;

  }

}