ESP 32 Membuat ESP32 Web Server - Arduino IDE

Tujuan

Kita akan mengontrol lampu LED dengan ESP32 sebagai kontroler melalui Web Browser, ESP32 akan diprogram sebagai web server, pemograman ESP32 menggunakan Software Arduino IDE.

Kalau mau lihat hasil videonya, bisa klik link youtube channel saya dibawah ini:

Youtube : Tech Wan

Proyek Overview

Web server ESP32 control 4 leds, dihubungkan ke ESP32 pin GPIO 2 , GPIO 4 , GPIO 34 , GPIO 32.
Kita dapat mengakses ESP32 melalui web browser dengan cara menelusuri IP Addres ESP32
Jika kita mengklik tombol on/off pada web browser maka status LED akan berubah.

Rangkaian

Pertama :

Kita memerlukan ESP32 board di Arduino IDE, bagi yang belum punya silahkan klik link dibawah ini untuk cara install ESP32 board, jika sudah ada kita bisa lanjut.

ESP32 : How to connect ESP32 to Wifi Network

Kedua :

Part yang dibutuhkan :

ESP32 WROOM 32 Devkit
4 buah lampu LEDs 5mm
4 buah Resistors 220 ohm
Jumper cables

Schematic

ESP32 Web Server Code :

/*********
Tech Wan
Patner for Development
*********/

// Load Wi-Fi library
#include <WiFi.h>

// Replace with your network credentials
const char* ssid = "namawifi"; // Your wifi
const char* password = "password"; // wifi 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 output2State = "off";
String output4State = "off";
String output33State = "off";
String output32State = "off";

// Assign output variables to GPIO pins
const int output2 = 2;
const int output4 = 4;
const int output33 = 33;
const int output32 = 32;

// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;

void setup() {
Serial.begin(115200);
// Initialize the output variables as outputs
pinMode(output2, OUTPUT);
pinMode(output4, OUTPUT);
pinMode(output33, OUTPUT);
pinMode(output32, OUTPUT);
// Set outputs to LOW
digitalWrite(output2, LOW);
digitalWrite(output4, LOW);
digitalWrite(output33, LOW);
digitalWrite(output32, 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,
currentTime = millis();
previousTime = currentTime;
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() && currentTime - previousTime <= timeoutTime) { // loop while the client's connected
currentTime = millis();
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 /2/on") >= 0) {
Serial.println("GPIO 2 on");
output2State = "on";
digitalWrite(output2, HIGH);
} else if (header.indexOf("GET /2/off") >= 0) {
Serial.println("GPIO 2 off");
output2State = "off";
digitalWrite(output2, 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);
}

else if (header.indexOf("GET /33/on") >= 0) {
Serial.println("GPIO 33 on");
output33State = "on";
digitalWrite(output33, HIGH);
} else if (header.indexOf("GET /33/off") >= 0) {
Serial.println("GPIO 33 off");
output33State = "off";
digitalWrite(output33, LOW);
}

else if (header.indexOf("GET /32/on") >= 0) {
Serial.println("GPIO 32 on");
output32State = "on";
digitalWrite(output32, HIGH);
} else if (header.indexOf("GET /32/off") >= 0) {
Serial.println("GPIO 32 off");
output32State = "off";
digitalWrite(output32, LOW);
}

// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your preferences
client.println("<style>html { font-family: Monaco; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #FF0000;}</style></head>");

// Web Page Heading
client.println("<body><h1>ESP32 Web Server</h1>");
client.println("<body><h2>Youtube : Tech Wan</h2>");

// Display current state, and ON/OFF buttons for GPIO 2
client.println("<p>Condition GPIO 2 - State " + output2State + "</p>");
// If the output26State is off, it displays the ON button
if (output2State=="off") {
client.println("<p><a href=\"/2/on\"><button class=\"button button2\">OFF</button></a></p>");
} else {
client.println("<p><a href=\"/2/off\"><button class=\"button\">ON</button></a></p>");
}

// Display current state, and ON/OFF buttons for GPIO 4
client.println("<p>Condition GPIO 4 - State " + output4State + "</p>");
// If the output4State is off, it displays the ON button
if (output4State=="off") {
client.println("<p><a href=\"/4/on\"><button class=\"button button2\">OFF</button></a></p>");

} else {
client.println("<p><a href=\"/4/off\"><button class=\"button\">ON</button></a></p>");
}

// Display current state, and ON/OFF buttons for GPIO 33
client.println("<p>Condition GPIO 33 - State " + output33State + "</p>");
// If the output33State is off, it displays the ON button
if (output33State=="off") {
client.println("<p><a href=\"/33/on\"><button class=\"button button2\">OFF</button></a></p>");

} else {
client.println("<p><a href=\"/33/off\"><button class=\"button\">ON</button></a></p>");
}

// Display current state, and ON/OFF buttons for GPIO 32
client.println("<p>Condition GPIO 32 - State " + output32State + "</p>");
// If the output33State is off, it displays the ON button
if (output32State=="off") {
client.println("<p><a href=\"/32/on\"><button class=\"button button2\">OFF</button></a></p>");
} else {
client.println("<p><a href=\"/32/off\"><button class=\"button\">ON</button></a></p>");
}

client.println("</body></html>");

// 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("");
}

}

Uploading the code

Tools --> Board --> ESP32 Arduino --> ESP32 Dev Module
Tools --> PORT --> Click available port
Sketch --> Upload --> wait "Connecting .... " --> push boot/flash button ESP32

Testing

Open Serial Monitor
Copy IP Address

Open web browser --> Type IP address

Sudah muncul tampilan di layar monitor web browser kan, kalau belum periksa lagi IP address nya, sudah benar atau belum.
Jika sudah, 4 buah tombol yang ada pada web browser itu mewakili 4 buah lampu led yang ada pada ESP32, jadi jika kita tekan tombol pertama ke posisi "ON" maka lampu LED akan menyala, begitu juga selanjutnya

Kesimpulan

Dengan menggunakan ESP32 sebagai web server, kita dapat mengendalikan lampu LED dari manapun kita berada selamat ada jaringan internet. Jika ada pertanyaan silahkan ditanya di kolom komentar, Terima Kasih.

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