ESP32 DHT22 + Telegram
/start:傳送歡迎訊息 /help:顯示可用指令清單 /status:立即查詢目前溫度與濕度
Telegram 端指令使用
1. 找到你的 Bot
在 Telegram 中搜尋你用 @BotFather 建立的 Bot 名稱,例如:
2. 可用指令列表
以下是你可以在對話視窗輸入的指令:
| 指令 | 功能說明 |
|---|---|
/start | 啟動 Bot,顯示歡迎訊息 |
/help | 顯示所有可用的指令說明 |
/status | 即時查詢目前的溫度與濕度 |
// /start:傳送歡迎訊息
// /help:顯示可用指令清單
// /status:立即查詢目前溫度與濕度
#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 "802390216815:AAE0KA1pbm5Ng00VCvO571JWA_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 "719652184629"
// DHT22 設定
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
// Telegram 設定
WiFiClientSecure secured_client;
UniversalTelegramBot bot(BOT_TOKEN, secured_client);
// 時間控制
unsigned long lastSendTime = 0;
const unsigned long sendInterval = 3000;
unsigned long lastBotCheck = 0;
const unsigned long botCheckInterval = 1000;
// 上一次讀取的值
float lastTemp = NAN;
float lastHum = NAN;
void setup() {
Serial.begin(115200);
dht.begin();
WiFi.begin(ssid, password);
Serial.print("WiFi 連線中");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("\nWiFi 已連線!");
Serial.println(WiFi.localIP());
// Telegram SSL 憑證略過
secured_client.setInsecure();
// 啟動訊息
Serial.println("\nESP32 開機完成,監控啟動!");
bot.sendMessage(CHAT_ID, "ESP32 開機完成,監控啟動!", "");
}
void loop() {
unsigned long now = millis();
// 1. 溫濕度有變化才上報
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) + " %";
bot.sendMessage(CHAT_ID, msg, "");
Serial.println("變化 -> 傳送");
}
}
// 2. 處理 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;
String user_name = bot.messages[i].from_name;
if (text == "/start") {
String welcome = "哈囉 " + user_name + "!我是 ESP32 環境監控 Bot。\n\n";
welcome += "輸入 /help 來查看所有指令。";
bot.sendMessage(chat_id, welcome, "");
}
else if (text == "/help") {
String helpMsg = "**可用指令:**\n";
helpMsg += "/start - 啟動對話\n";
helpMsg += "/status - 查詢目前溫濕度\n";
helpMsg += "/help - 顯示指令說明";
bot.sendMessage(chat_id, helpMsg, "");
}
else 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,請稍後再試。", "");
} 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, "");
}
}
else {
bot.sendMessage(chat_id, "無效指令,請輸入 /help 查看可用指令。", "");
}
}
numNewMessages = bot.getUpdates(bot.last_message_received + 1);
}
lastBotCheck = now;
}
}


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