ESP32 Telegram Bot to Control LED
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h>
// --- WiFi Configuration ---
const char* ssid = "Wokwi-GUEST"; // Replace with your network credentials
const char* password = "";
// --- Telegram Bot Configuration ---
#define BOTtoken "8022700986:AAGymymK9_d1HcTGJWl3mtqHmilxB64_5Zw" // your Bot Token (Get from Botfather)
#define CHAT_ID "7965218469"
WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);
// Checks for new messages every 1 second.
int botRequestDelay = 1000;
unsigned long lastTimeBotRan;
const int ledPin = 2;
bool ledState = LOW;
// Handle what happens when you receive new messages
void handleNewMessages(int numNewMessages) {
Serial.println("handleNewMessages");
Serial.println(String(numNewMessages));
for (int i=0; i<numNewMessages; i++) {
// Chat id of the requester
String chat_id = String(bot.messages[i].chat_id);
if (chat_id != CHAT_ID){
bot.sendMessage(chat_id, "Unauthorized user", "");
continue;
}
// Print the received message
String text = bot.messages[i].text;
Serial.println(text);
String from_name = bot.messages[i].from_name;
if (text == "/start") {
String welcome = "Welcome, " + from_name + ".\n";
welcome += "Use the following commands to control your outputs.\n\n";
welcome += "/led_on to turn GPIO ON \n";
welcome += "/led_off to turn GPIO OFF \n";
welcome += "/state to request current GPIO state \n";
bot.sendMessage(chat_id, welcome, "");
}
if (text == "/led_on") {
bot.sendMessage(chat_id, "LED state set to ON", "");
ledState = HIGH;
digitalWrite(ledPin, ledState);
}
if (text == "/led_off") {
bot.sendMessage(chat_id, "LED state set to OFF", "");
ledState = LOW;
digitalWrite(ledPin, ledState);
}
if (text == "/state") {
if (digitalRead(ledPin)){
bot.sendMessage(chat_id, "LED is ON", "");
}
else{
bot.sendMessage(chat_id, "LED is OFF", "");
}
}
}
}
void setup() {
Serial.begin(115200);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, ledState);
// Connect to Wi-Fi
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // Add root certificate for api.telegram.org
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}
// Print ESP32 Local IP Address
Serial.println(WiFi.localIP());
Serial.println("Start telegram Led control command");
}
void loop() {
if (millis() > lastTimeBotRan + botRequestDelay) {
int numNewMessages = bot.getUpdates(bot.last_message_received + 1);
while(numNewMessages) {
Serial.println("got response");
handleNewMessages(numNewMessages);
numNewMessages = bot.getUpdates(bot.last_message_received + 1);
}
lastTimeBotRan = millis();
}
}
<<freeRTOS 寫法>>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h> // Make sure this is included for handleNewMessages (even if not explicitly used in your provided snippet, it's common for bot libraries)
// --- WiFi Configuration ---
const char* ssid = "Wokwi-GUEST"; // Replace with your network credentials
const char* password = "";
// --- Telegram Bot Configuration ---
#define BOTtoken "8022700986:AAGymymK9_d1HcTGJWl3mtqHmilxB64_5Zw" // your Bot Token (Get from Botfather)
#define CHAT_ID "7965218469"
WiFiClientSecure client;
UniversalTelegramBot bot(BOTtoken, client);
// Checks for new messages every 1 second.
int botRequestDelay = 1000;
const int ledPin = 2;
bool ledState = LOW;
// Task handle for the bot update task
TaskHandle_t botUpdateTaskHandle = NULL;
// Handle what happens when you receive new messages
void handleNewMessages(int numNewMessages) {
Serial.println("handleNewMessages");
Serial.println(String(numNewMessages));
for (int i = 0; i < numNewMessages; i++) {
// Chat id of the requester
String chat_id = String(bot.messages[i].chat_id);
if (chat_id != CHAT_ID) {
bot.sendMessage(chat_id, "Unauthorized user", "");
continue;
}
// Print the received message
String text = bot.messages[i].text;
Serial.println(text);
String from_name = bot.messages[i].from_name;
if (text == "/start") {
String welcome = "Welcome, " + from_name + ".\n";
welcome += "Use the following commands to control your outputs.\n\n";
welcome += "/led_on to turn GPIO ON \n";
welcome += "/led_off to turn GPIO OFF \n";
welcome += "/state to request current GPIO state \n";
bot.sendMessage(chat_id, welcome, "");
} else if (text == "/led_on") {
bot.sendMessage(chat_id, "LED state set to ON", "");
ledState = HIGH;
digitalWrite(ledPin, ledState);
} else if (text == "/led_off") {
bot.sendMessage(chat_id, "LED state set to OFF", "");
ledState = LOW;
digitalWrite(ledPin, ledState);
} else if (text == "/state") {
if (digitalRead(ledPin)) {
bot.sendMessage(chat_id, "LED is ON", "");
} else {
bot.sendMessage(chat_id, "LED is OFF", "");
}
}
}
}
// FreeRTOS Task for handling Telegram Bot updates
void telegramBotTask(void *pvParameters) {
unsigned long lastTimeBotRan = 0; // Initialize inside the task for its own scope
for (;;) {
if (millis() > lastTimeBotRan + botRequestDelay) {
int numNewMessages = bot.getUpdates(bot.last_message_received + 1);
while (numNewMessages) {
Serial.println("got response");
handleNewMessages(numNewMessages);
numNewMessages = bot.getUpdates(bot.last_message_received + 1);
}
lastTimeBotRan = millis();
}
// Give control back to the scheduler, or yield, to allow other tasks to run
// This is crucial for collaborative multitasking, especially if the if condition is frequently false
vTaskDelay(pdMS_TO_TICKS(50)); // Check every 50ms (or adjust based on responsiveness needed)
}
}
void setup() {
Serial.begin(115200);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, ledState);
// Connect to Wi-Fi
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
client.setCACert(TELEGRAM_CERTIFICATE_ROOT); // Add root certificate for api.telegram.org
Serial.print("Connecting to WiFi..");
while (WiFi.status() != WL_CONNECTED) {
delay(1000); // Using delay here is acceptable as it's during initial setup
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("ESP32 Local IP Address: ");
Serial.println(WiFi.localIP());
Serial.println("Start telegram Led control command");
// Create the Telegram Bot update task
// Allocate a larger stack size for the bot task, as network operations and JSON parsing can be memory intensive.
// 4096 or 8192 bytes is a good starting point to avoid stack overflows.
xTaskCreate(
telegramBotTask, // Task function
"TelegramBotTask", // Name of the task
8192, // Stack size in words (ESP32 uses 4-byte words, so 8192 * 4 = 32KB) - This is a safe large value
NULL, // Parameter to pass to the task
5, // Priority (higher number = higher priority)
&botUpdateTaskHandle // Task handle
);
}
void loop() {
// The loop can be empty as FreeRTOS tasks handle the continuous operations.
// You can add other independent, non-blocking code here if needed.
}
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