10. Led/Relay Control by the Browser

Connection of Led with Arduino:

Led have two terminals, first is positive terminal and second is Negative Terminal. The Negative Terminal is connected to the Ground pin of ESP8266 module and Positive Terminal is connected to the 220ohm Resistance and the other side of resistance is connected to the D7 pin of ESP8266 Module.

Circuit Diagram:




Program:
#include <ESP8266WiFi.h>

const char* ssid = "manish"; // SSID i.e. Service Set Identifier is the name of your WIFI
const char* password = "manish8294"; // Your Wifi password, in case you have open network comment the whole statement.

int ledPin = 13; // GPIO13 or for NodeMCU you can directly write D7
WiFiServer server(80); // Creates a server that listens for incoming connections on the specified port, here in this case port is 80.

void setup()
{
Serial.begin(115200);
delay(10);
pinMode(ledPin, OUTPUT); digitalWrite(ledPin, LOW);
// Connect to WiFi network Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) { delay(500);
Serial.print(".");
}
Serial.println(""); Serial.println("WiFi connected");
// Start the server server.begin(); Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL to connect: "); Serial.print("http://");
Serial.print(WiFi.localIP()); //Gets the WiFi shield's IP address and Print the IP address of serial monitor
Serial.println("/");
}


void  loop() {
// Check if a client has connected WiFiClient client = server.available(); if (!client) {
return;
}
// Wait until the client sends some data Serial.println("new client"); while(!client.available()){
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('\r'); Serial.println(request);
client.flush();
// Match the request
int value = LOW;
if (request.indexOf("/LED=ON") != -1) { digitalWrite(ledPin, HIGH);
value = HIGH;
}
if (request.indexOf("/LED=OFF") != -1) { digitalWrite(ledPin, LOW);
value = LOW;
}

// Set ledPin according to the request
//digitalWrite(ledPin, value);
// Return the response client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println(""); // do not forget this one client.println("<!DOCTYPE HTML>"); client.println("<html>");
client.print("Led pin is now: ");
if(value == HIGH) { client.print("On");
} else { client.print("Off");
}
client.println("<br><br>");
client.println("<a href=\"/LED=ON\"\"><button>Turn On </button></a>"); client.println("<a href=\"/LED=OFF\"\"><button>Turn Off </button></a><br />"); client.println("</html>");
delay(1);
Serial.println("Client disonnected"); Serial.println("");
}


Then we upload the code in ESP8266 Module and Open Serial monitor and the WIFI connection and IP address is appear as shown in figure.



Then copy the URL link and open in Browser then Led on and Off Buttons is present thenclick the buttons and see the response in LED connected to ESP8266 Module.





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