Control Your ESP enabled MCU using android app or your browser.

Smart Home_Using_Wi-Fi_and_ESPxx_Module.ino

/* By Boateng Oduro
 * for Tutorials and more projects visit https://www.electrotekgh.com
 * or Whatsapp me on +233266302607
 */

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

MDNSResponder mdns;

// Replace with your network credentials
const char* ssid = " Your HOTSPOT/ROUTER name ";
const char* password = "  Your HOTSPOT/ROUTER password  ";

ESP8266WebServer server(80);


/*****To control Using web browser*****/
String webPage = "";


/***Defining Pins***/
int Relay4 = D8;//
int Relay3 = D7;//
int Relay2 = D6;//
int Relay1 = D5;//

/***Wi-Fi connection LED***/
int led_pin = D6;


void setup(void) {

/***HTML Webpage for controlling with browser, Just connect your PC to the same hotspot and type the IP address***/  
  webPage += "<center><h1>SMART HOME BY BOATENG ODURO</h1><p>LIGHT 1 #1 <a href=\"LED1On\"><button>ON</button></a>&nbsp;<a href=\"LED1Off\"><button>OFF</button></a></p></center>";
  webPage += "<center><p>LIGHT 2 <a href=\"LED2On\"><button>ON</button></a>&nbsp;<a href=\"LED2Off\"><button>OFF</button></a></p></center>";
  webPage += "<center><p>FAN <a href=\"LED3On\"><button>ON</button></a>&nbsp;<a href=\"LED3Off\"><button>OFF</button></a></p></center>";
  webPage += "<center><p>HEATER <a href=\"LED4On\"><button>ON</button></a>&nbsp;<a href=\"LED4Off\"><button>OFF</button></a></p></center>";



  delay(1000);
  Serial.begin(9600);
  WiFi.persistent(false);
  WiFi.mode(WIFI_OFF);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("");
  Serial.println(WiFi.localIP());
  
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");

    // preparing Pins
    pinMode(Relay4, OUTPUT);
    digitalWrite(Relay4, LOW);
    pinMode(led_pin, OUTPUT);
    digitalWrite(led_pin, LOW);
    pinMode(Relay2, OUTPUT);
    digitalWrite(Relay2, LOW);
    pinMode(Relay1, OUTPUT);
    digitalWrite(Relay1, LOW);


  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (mdns.begin("esp8266", WiFi.localIP())) {
    Serial.println("MDNS responder started");
    digitalWrite (led_pin, HIGH);
  }

  server.on("/", []() {
    server.send(200, "text/html", webPage);
  });
  server.on("/LED1On", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay1, HIGH);
    delay(1000);
  });
  server.on("/LED1Off", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay1, LOW);
    delay(1000);
  });
  server.on("/LED2On", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay2, HIGH);
    delay(1000);
  });
  server.on("/LED2Off", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay2, LOW);
    delay(1000);
  });
  server.on("/LED3On", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay3, HIGH);
    delay(1000);
  });

  server.on("/LED3Off", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay3, LOW);
    delay(1000);
  });
  server.on("/LED4On", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay4, HIGH);
    delay(1000);
  });

  server.on("/LED4Off", []() {
    server.send(200, "text/html", webPage);
    digitalWrite(Relay4, LOW);
    delay(1000);
  });

  server.begin();
  Serial.println("HTTP server started");
}

void loop(void) {
  server.handleClient();
}