28/06/2019
- 01 module Based Webserver to Control LED from Webpage :-
ESP series WiFi module becomes very popular among hobbyists and industries for IoT based projects. ESP8266 Wi-Fi transceiver is one of the most used module for IoT based Applications. Here, we are using ESP8266 NodeMCU to connect with ThingSpeak IoT cloud Platform. A NodeMCU have inbuilt Wi-Fi shield so we don’t need to connect an external Wi-Fi shield like we used to do with Arduino. Previously, we have used ESP32 webserver for controlling LED using webpage.
In this project, we are making an IoT based LED control from webpage using ESP8266. Even by doing some small modifications in this same project, we can use this for home automation. For controlling the LED using Webserver we need to create an HTML webpage. The page will have two buttons for turning LED ON and OFF.
*Components Required :-
1. ESP8266 -01 Module
2. LED
3. 250 ohm Resistor
4. Breadboard
5. Jumper Wires
*Code :-
Copy the code below to your Arduino IDE, but don’t upload it yet. You need to make some changes to make it work for you.
// Replace with your network credentials
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
// Auxiliar variables to store the current output state
String output5State = "off";
String output4State = "off";
// Assign output variables to GPIO pins
const int output5 = 5;
const int output4 = 4;
void setup() {
Serial.begin(115200);
// Initialize the output variables as outputs
pinMode(output5, OUTPUT);
pinMode(output4, OUTPUT);
// Set outputs to LOW
digitalWrite(output5, LOW);
digitalWrite(output4, LOW);
// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the client
while (client.connected()) { // loop while the client's connected
if (client.available()) { // if there's bytes to read from the client,
char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;
if (c == '\n') { // if the byte is a newline character
// if the current line is blank, you got two newline characters in a row.
// that's the end of the client HTTP request, so send a response:
if (currentLine.length() == 0) {
// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
// and a content-type so the client knows what's coming, then a blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
// turns the GPIOs on and off
if (header.indexOf("GET /5/on") >= 0) {
Serial.println("GPIO 5 on");
output5State = "on";
digitalWrite(output5, HIGH);
} else if (header.indexOf("GET /5/off") >= 0) {
Serial.println("GPIO 5 off");
output5State = "off";
digitalWrite(output5, LOW);
} else if (header.indexOf("GET /4/on") >= 0) {
Serial.println("GPIO 4 on");
output4State = "on";
digitalWrite(output4, HIGH);
} else if (header.indexOf("GET /4/off") >= 0) {
Serial.println("GPIO 4 off");
output4State = "off";
digitalWrite(output4, LOW);
}
// Display the HTML web page
client.println("");
client.println("");
client.println("");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: ; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: ;}");
// Web Page Heading
client.println("ESP8266 Web Server");
// Display current state, and ON/OFF buttons for GPIO 5
client.println("GPIO 5 - State " + output5State + "");
// If the output5State is off, it displays the ON button
if (output5State=="off") {
client.println("ON");
} else {
client.println("OFF");
}
// Display current state, and ON/OFF buttons for GPIO 4
client.println("GPIO 4 - State " + output4State + "");
// If the output4State is off, it displays the ON button
if (output4State=="off") {
client.println("ON");
} else {
client.println("OFF");
}
client.println("");
// The HTTP response ends with another blank line
client.println();
// Break out of the while loop
break;
} else { // if you got a newline, then clear currentLine
currentLine = "";
}
} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine
}
}
}
// Clear the header variable
header = "";
// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");
}
}
