How To Control Home Appliance From Internet Using Arduino and ESP8266

Components Required :-

1. 1 x Arduino uno board
2. 1 x USB cable
3. 1 x ESP8266 WiFi Module
4. 1 x Relay Board
5. 1 x Jumper wire (Male to Male)
6. 9 x Jumper wire (Male to Female)
7. 1 x Breadboard
8. 1 x Yellow Bulb
9. 1 x Red Bulb

Connection :-

#include "SoftwareSerial.h"

String ssid ="WIFI_NAME";
String password="WIFI_PASSWORD";

SoftwareSerial esp(3, 2);// RX, TX

String server = "www.iotboys.com"; //Your Host 
String uri = "/YOUR_API"; // Your URI

int RED_BULB=5; 
int YELLOW_BULB=6;

void setup() {

  pinMode(RED_BULB, OUTPUT);
  pinMode(YELLOW_BULB, OUTPUT);
  
  digitalWrite(RED_BULB, HIGH);
  digitalWrite(YELLOW_BULB, HIGH);
  
  esp.begin(9600);
  
  Serial.begin(9600);

  connectWifi();
  
  httpget();
  
  delay(1000);

}
void connectWifi() {

String cmd = "AT+CWJAP=\"" +ssid+"\",\"" + password + "\"";

esp.println(cmd);

delay(4000);

if(esp.find("OK")) {

Serial.println("Connected!");

}
else {

Serial.println("Cannot connect to wifi ! Connecting again..."); }
connectWifi();

}
/////////////////////////////GET METHOD///////////////////////////////
void httpget() {
esp.println("AT+CIPSTART=\"TCP\",\"" + server + "\",80");//start a TCP connection.

if( esp.find("OK")) {

Serial.println("TCP connection ready");

} delay(1000);

String getRequest =
"GET " + uri + " HTTP/1.0\r\n" +
"Host: " + server + "\r\n" +
"Accept: *" + "/" + "*\r\n" +
"Content-Type: application/json\r\n" +
"\r\n";

String sendCmd = "AT+CIPSEND=";

esp.print(sendCmd);

esp.println(getRequest.length() );

delay(500);

if(esp.find(">")) { 
  Serial.println("Sending.."); 
  esp.print(getRequest);
  
if( esp.find("SEND OK")) { 
  
Serial.println("Packet sent");

while (esp.available()) {

String response = esp.readString();

int RED_BULB_ON = response.indexOf("RED_BULB>TRUE")>0?1:0;
int YELLOW_BULB_ON = response.indexOf("YELLOW_BULB>TRUE")>0?1:0;

if(RED_BULB_ON==1)
{
  digitalWrite(RED_BULB, LOW);
}
else
{
  digitalWrite(RED_BULB, HIGH);
}
if(YELLOW_BULB_ON==1)
{
  digitalWrite(YELLOW_BULB, LOW);
}
else
{
  digitalWrite(YELLOW_BULB, HIGH);
}
}
esp.println("AT+CIPCLOSE");

}
}
}

void loop() {
  httpget();
}