✅ ESP32 Smart Door Lock (WiFi Terminal Home Router Mode)

ESP32 will connect to:

• WiFi Name: YOUR_WIFI_NAME

• Password: YOUR_WIFI_PASSWORD

ESP32 will get an IP like:

• 192.168.1.5 or 192.168.0.10 (depends on router)

📱 WiFiTerminal App Settings

Use:

✅ WiFi Terminal app (TCP Client)

Set:

• IP = ESP32 IP address (shown in Serial Monitor)

• Port = 8080

✅ Commands

✅ FULL CODE (ESP32 + Home WiFi + WiFiTerminal)

#include <WiFi.h>
#include <Servo.h>

// ---------------- WiFi Settings ----------------
const char* ssid = "YOUR_WIFI_NAME";
const char* password = "YOUR_WIFI_PASSWORD";

// ---------------- TCP Server ----------------
WiFiServer server(8080);

// ---------------- Pins ----------------
#define SERVO_PIN 13
#define RELAY_PIN 26

// ---------------- Servo ----------------
Servo lockServo;

int LOCK_ANGLE = 0;
int UNLOCK_ANGLE = 90;

bool isUnlocked = false;

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

// Relay setup
pinMode(RELAY_PIN, OUTPUT);
digitalWrite(RELAY_PIN, LOW); // Solenoid OFF initially

// Servo setup
lockServo.attach(SERVO_PIN);
lockServo.write(LOCK_ANGLE); // start locked

// ---------------- Connect to WiFi ----------------
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);

Serial.println("==================================");
Serial.println(" ESP32 Door Lock (Home WiFi Mode) ");
Serial.println("==================================");
Serial.print("Connecting to WiFi: ");
Serial.println(ssid);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}

Serial.println("\n✅ WiFi Connected!");
Serial.print("ESP32 IP Address: ");
Serial.println(WiFi.localIP());
Serial.println("TCP Port: 8080");
Serial.println("----------------------------------");

// Start TCP server
server.begin();
}

void loop() {

WiFiClient client = server.available();

if (client) {
Serial.println("📱 Client Connected!");

client.println("Welcome to ESP32 Door Lock!");
client.println("Commands:");
client.println("1 = Unlock");
client.println("0 = Lock");
client.println("S = Status");
client.println("---------------------------");

while (client.connected()) {

if (client.available()) {
char cmd = client.read();

// ignore newline / spaces
if (cmd == '\n' || cmd == '\r' || cmd == ' ') continue;

Serial.print("Command Received: ");
Serial.println(cmd);

if (cmd == '1') {
unlockDoor(client);
}
else if (cmd == '0') {
lockDoor(client);
}
else if (cmd == 'S' || cmd == 's') {
showStatus(client);
}
else {
client.println("❌ Invalid Command! Use 1 / 0 / S");
}
}
}

client.stop();
Serial.println("❌ Client Disconnected!");
}
}

// ---------------- Functions ----------------

void unlockDoor(WiFiClient &client) {
client.println("🔓 Unlocking Door...");

// Step 1: Servo unlock
lockServo.write(UNLOCK_ANGLE);
delay(700);

// Step 2: Relay ON (Solenoid ON)
digitalWrite(RELAY_PIN, HIGH);
delay(200);

isUnlocked = true;

client.println("✅ Door Unlocked!");
}

void lockDoor(WiFiClient &client) {
client.println("🔒 Locking Door...");

// Step 1: Relay OFF (Solenoid OFF)
digitalWrite(RELAY_PIN, LOW);
delay(200);

// Step 2: Servo lock
lockServo.write(LOCK_ANGLE);
delay(700);

isUnlocked = false;

client.println("✅ Door Locked!");
}

void showStatus(WiFiClient &client) {
if (isUnlocked) {
client.println("📌 Status: Door is UNLOCKED 🔓");
} else {
client.println("📌 Status: Door is LOCKED 🔒");
}
}

✅ Code Explanation (Very Easy)

🔹 1) WiFi Station Mode

This makes ESP32 connect to your router like a normal device.

🔹 2) Wait until WiFi connects

ESP32 keeps trying until WiFi is connected.

🔹 3) Print IP Address

This is VERY important.

📌 Because WiFiTerminal app needs ESP32 IP.

🔹 4) TCP Server

ESP32 opens port 8080.

🔹 5) Phone connects to ESP32

Your phone must be on same WiFi network.

Then WiFiTerminal sends commands to:

📌 IP = ESP32 IP
📌 Port = 8080

🔹 6) Commands Control

Simple and fast.

📱 How to Connect in WiFiTerminal App

Step 1:

Connect your phone to same WiFi router.

Step 2:

Open Serial Monitor and copy ESP32 IP.

Example:
192.168.1.8

Step 3:

Open WiFiTerminal app

Set:

• Mode: TCP Client

• Server IP: 192.168.1.8

• Port: 8080

Step 4:

Send command:

• 1

• 0

• S

⚠️ Very Important Notes

✅ 1) Same WiFi

Phone + ESP32 must be connected to same router WiFi.

✅ 2) Router Isolation

Some routers block device-to-device connection.

If app can’t connect:

• Turn OFF “AP Isolation”

• Turn OFF “Client Isolation”

✅ 3) Relay Reverse Problem

If relay works opposite, change:

For Relay ON:

For Relay OFF: