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- /*********
- Rui Santos
- Complete project details at https://randomnerdtutorials.com
- *********/
- // Load Wi-Fi library
- #include <WiFi.h>
- // Replace with your network credentials
- const char* ssid = "Network";
- const char* password = "123456789";
- // 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 output26State = "off";
- String output27State = "off";
- // Assign output variables to GPIO pins
- const int output26 = 26;
- const int output27 = 27;
- // 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(output26, OUTPUT);
- pinMode(output27, OUTPUT);
- // Set outputs to LOW
- digitalWrite(output26, LOW);
- digitalWrite(output27, 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 /26/on") >= 0) {
- Serial.println("GPIO 26 on");
- output26State = "on";
- digitalWrite(output26, HIGH);
- } else if (header.indexOf("GET /26/off") >= 0) {
- Serial.println("GPIO 26 off");
- output26State = "off";
- digitalWrite(output26, LOW);
- } else if (header.indexOf("GET /27/on") >= 0) {
- Serial.println("GPIO 27 on");
- output27State = "on";
- digitalWrite(output27, HIGH);
- } else if (header.indexOf("GET /27/off") >= 0) {
- Serial.println("GPIO 27 off");
- output27State = "off";
- digitalWrite(output27, 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: Helvetica; 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: #555555;}</style></head>");
- // Web Page Heading
- client.println("<body><h1>ESP32 Web Server</h1>");
- // Display current state, and ON/OFF buttons for GPIO 26
- client.println("<p>GPIO 26 - State " + output26State + "</p>");
- // If the output26State is off, it displays the ON button
- if (output26State=="off") {
- client.println("<p><a href=\"/26/on\"><button class=\"button\">ON</button></a></p>");
- } else {
- client.println("<p><a href=\"/26/off\"><button class=\"button button2\">OFF</button></a></p>");
- }
- // Display current state, and ON/OFF buttons for GPIO 27
- client.println("<p>GPIO 27 - State " + output27State + "</p>");
- // If the output27State is off, it displays the ON button
- if (output27State=="off") {
- client.println("<p><a href=\"/27/on\"><button class=\"button\">ON</button></a></p>");
- } else {
- client.println("<p><a href=\"/27/off\"><button class=\"button button2\">OFF</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("");
- }
- }
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