ESP8266 Telegram LED Control IoT Project

Controlling an LED using an ESP8266 and a Telegram bot is a great Internet of Things (IoT) project that allows you to remotely control an LED using your smartphone. Here are the basic steps you need to follow:

Step 1: Gather the Materials

ESP8266 board
LED
Resistor (220 ohm)
Breadboard
Jumper wires
USB cable
Computer with Arduino IDE software installed
Smartphone with Telegram app installed

Step 2: Set up the Telegram bot

Create a new bot on Telegram by following the instructions on the Telegram documentation.
Obtain the API token for your bot.
Start a conversation with your bot on Telegram.
Obtain your chat ID by sending a message to the bot and then visiting the following URL in your web browser: https://api.telegram.org/bot<API_token>/getUpdates (replace <API_token> with your actual API token). Look for the "chat" section in the response and copy the chat ID.

Step 3: Set up the ESP8266 board

Connect the LED to the ESP8266 board with the resistor in series with the LED. The resistor limits the current flowing through the LED, which protects it from burning out.
Connect the ESP8266 board to your computer using a USB cable.
Open the Arduino IDE and select the appropriate board and port in the "Tools" menu.
Download and install the Telegram bot library for Arduino by following the instructions on the GitHub repository: https://github.com/witnessmenow/arduino-telegram-bot
Copy and paste the following code into the Arduino IDE:

arduino

#include <UniversalTelegramBot.h>
#include <ESP8266WiFi.h>

#define LED_PIN 2

// Replace with your Wi-Fi credentials
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

// Replace with your Telegram bot token and chat ID
#define BOT_TOKEN "YOUR_BOT_TOKEN"
#define CHAT_ID YOUR_CHAT_ID

WiFiClientSecure client;
UniversalTelegramBot bot(BOT_TOKEN, client);

void setup() {
  Serial.begin(115200);

  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, LOW);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  bot.begin();
}

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

  while (numNewMessages) {
    Serial.println("New message(s) received:");

    for (int i = 0; i < numNewMessages; i++) {
      String chat_id = String(bot.messages[i].chat_id);
      String text = bot.messages[i].text;

      if (text == "/on") {
        digitalWrite(LED_PIN, HIGH);
        bot.sendMessage(chat_id, "LED turned on");
      } else if (text == "/off") {
        digitalWrite(LED_PIN, LOW);
        bot.sendMessage(chat_id, "LED turned off");
      } else {
        bot.sendMessage(chat_id, "Invalid command");
      }
    }

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

  delay(1000);
}

Replace "YOUR_SSID", "YOUR_PASSWORD", "YOUR_BOT_TOKEN", and "YOUR_CHAT_ID" with your actual Wi-Fi credentials, Telegram bot token, and chat ID, respectively.
Upload the code to the ESP8266 board.

Step 4: Test the project