Build Instructions

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• 1

  Step 1: Arduino IDE Set-up + Telegram Bot

   

  For Arduino IDE Setup Follow these steps:

  1. Open Arduino IDE on your computer.
  2. Go to File > Preferences.
  3. In the Additional Board Manager URLs field, paste this link:

     https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json

  4. Then click OK.
  5. Next, go to Tools > Board > Board Manager.
  6. Search for ESP32, then click Install.

  Now install the required library:

  1. Open Sketch > Include Library > Manage Libraries.
  2. Search for UniversalTelegramBot.h.
  3. Install it.

  Create a Telegram Bot:

  1. Open the Telegram app on your phone.
  2. Search for @BotFather (the official Telegram bot creator).
  3. Start a chat and type /newbot.
  4. Give your bot a name and a unique username.
  5. BotFather will generate a token for your bot. (Copy and save this token; we will use it in the Arduino code.)
• 2

  Step 1: Part 1: Basic Coding

  About this step:

  we’ll write a code that allows our Telegram bot to take a command from the user and reply with a simple pre-set message

  Code:

  #include <WiFi.h>
  #include <WiFiClientSecure.h>
  #include <UniversalTelegramBot.h>
  
  // ============ Replace these with your details ============
  const char* ssid = "WIFI_NAME";
  const char* password = "WIFI_PASSWORD";
  
  const char* botToken = "TELEGRAM_BOT_TOKEN";   // Your Telegram Bot Token
  // ========================================================
  
  // Setup secure WiFi client for HTTPS
  WiFiClientSecure netClient;
  UniversalTelegramBot bot(botToken, netClient);
  
  unsigned long lastCheckTime = 0;
  const unsigned long checkInterval = 1000; 
  
  void setup() {
    Serial.begin(115200);
  
    // Wi-Fi connect
    WiFi.begin(ssid, password);
    Serial.print("Connecting to WiFi");
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("\nConnected.");
  
    netClient.setInsecure();
  
    Serial.println("Telegram Bot started.");
  }
  
  void loop() {
    // Periodically check for new messages
    if (millis() - lastCheckTime >= checkInterval) {
      checkTelegramBot();
      lastCheckTime = millis();
    }
  }
  
  void checkTelegramBot() {
    int numNewMessages = bot.getUpdates(bot.last_message_received + 1);
  
    while (numNewMessages) {
      for (int i = 0; i < numNewMessages; i++) {
        String chat_id = String(bot.messages[i].chat_id);
        String text    = bot.messages[i].text;
  
        Serial.print("Received: "); Serial.println(text);
  
        if (text == "/ask") {
          String response = "Hello, bro!";
          bot.sendMessage(chat_id, response, "");
          Serial.println("Sent reply: Hello, bro!");
        }
      }
      numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    }
  }

  Connect the board to your computer using a USB-C cable. With the Arduino IDE open and your code ready, ensure you have selected the correct board and port by navigating to the Tools menu. Then, click the Upload button (the right-arrow icon) to begin compiling and flashing the sketch to the XIAO ESP32S3. 

• 3

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