ESP32 Smart Garage Door Opener (IoT)

/*********************************************************************
 * ESP32 Smart Garage Door Opener
 * 
 * Control garage door via WiFi and Telegram
 * Hardware: ESP32, 5V Relay, Push Button
 *********************************************************************/

#include 
#include 
#include 

// ============== WIFI ==============
const char* wifi_ssid = "YOUR_WIFI";
const char* wifi_password = "YOUR_PASSWORD";

// ============== TELEGRAM ==============
#define BOT_TOKEN "YOUR_BOT_TOKEN"
#define CHAT_ID "YOUR_CHAT_ID"

WiFiClientSecure client;
UniversalTelegramBot bot(BOT_TOKEN, client);

// ============== PINS ==============
#define RELAY_PIN 26
#define BUTTON_PIN 25
#define LED_PIN 2

// ============== CONFIG ==============
unsigned long lastTrigger = 0;
const unsigned long DOOR_TIME = 1000;  // 1 second pulse

bool doorState = false;  // false = closed, true = open

void setup() {
  Serial.begin(115200);
  
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);
  
  digitalWrite(RELAY_PIN, HIGH);  // Relay OFF
  digitalWrite(LED_PIN, LOW);
  
  connectToWiFi();
  client.setCACert(TELEGRAM_CERTIFICATE_ROOT);
  
  Serial.println(F("Garage Door Opener Active!"));
}

void loop() {
  // Check manual button
  if (digitalRead(BUTTON_PIN) == LOW) {
    toggleDoor();
    delay(500);  // Debounce
  }
  
  // Check for Telegram commands
  handleTelegram();
  
  delay(100);
}

void toggleDoor() {
  unsigned long now = millis();
  if (now - lastTrigger < 5000) {
    return;  // Prevent rapid triggers
  }
  
  lastTrigger = now;
  
  Serial.println(F("Toggling door..."));
  
  // Pulse relay
  digitalWrite(RELAY_PIN, LOW);
  delay(DOOR_TIME);
  digitalWrite(RELAY_PIN, HIGH);
  
  // Flash LED
  for (int i = 0; i < 3; i++) {
    digitalWrite(LED_PIN, HIGH);
    delay(200);
    digitalWrite(LED_PIN, LOW);
    delay(200);
  }
  
  String status = doorState ? "CLOSED" : "OPEN";
  doorState = !doorState;
  
  bot.sendMessage(CHAT_ID, "Garage door is now " + status, "");
}

void handleTelegram() {
  int numNewMessages = bot.getUpdates(bot.last_message_received + 1);
  
  for (int i = 0; i < numNewMessages; i++) {
    String chat_id = String(bot.messages[i].chat_id);
    String text = bot.messages[i].text;
    
    if (chat_id == CHAT_ID) {
      if (text == "/open" || text == "/close" || text == "/toggle") {
        toggleDoor();
        bot.sendMessage(chat_id, "Door command received!", "");
      } else if (text == "/status") {
        String status = doorState ? "OPEN" : "CLOSED";
        bot.sendMessage(chat_id, "Garage door is " + status, "");
      } else if (text == "/start") {
        bot.sendMessage(chat_id, "Garage Door Bot\n/open - Open door\n/close - Close door\n/status - Check status", "");
      }
    }
  }
}

void connectToWiFi() {
  WiFi.begin(wifi_ssid, wifi_password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(F("."));
  }
  Serial.println(F(" Connected!"));
}