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  1. #include <ESP8266WiFi.h>
  2.  
  3. const char* ssid = "YOUR SSID";
  4. const char* password = "WIFI PASSWORD";
  5.  
  6. int ledPin = 13; // GPIO13
  7. WiFiServer server(80);
  8.  
  9. void setup() {
  10.   Serial.begin(115200);
  11.   delay(10);
  12.  
  13.   pinMode(ledPin, OUTPUT);
  14.   digitalWrite(ledPin, LOW);
  15.  
  16.   // Connect to WiFi network
  17.   Serial.println();
  18.   Serial.println();
  19.   Serial.print("Connecting to ");
  20.   Serial.println(ssid);
  21.  
  22.   WiFi.begin(ssid, password);
  23.  
  24.   while (WiFi.status() != WL_CONNECTED) {
  25.     delay(500);
  26.     Serial.print(".");
  27.   }
  28.   Serial.println("");
  29.   Serial.println("WiFi connected");
  30.  
  31.   // Start the server
  32.   server.begin();
  33.   Serial.println("Server started");
  34.  
  35.   // Print the IP address
  36.   Serial.print("Use this URL to connect: ");
  37.   Serial.print("http://");
  38.   Serial.print(WiFi.localIP());
  39.   Serial.println("/");
  40.  
  41. }
  42.  
  43. void loop() {
  44.   // Check if a client has connected
  45.   WiFiClient client = server.available();
  46.   if (!client) {
  47.     return;
  48.   }
  49.  
  50.   // Wait until the client sends some data
  51.   Serial.println("new client");
  52.   while(!client.available()){
  53.     delay(1);
  54.   }
  55.  
  56.   // Read the first line of the request
  57.   String request = client.readStringUntil('\r');
  58.   Serial.println(request);
  59.   client.flush();
  60.  
  61.   // Match the request
  62.  
  63.   int value = LOW;
  64.   if (request.indexOf("/LED=ON") != -1)  {
  65.     digitalWrite(ledPin, HIGH);
  66.     value = HIGH;
  67.   }
  68.   if (request.indexOf("/LED=OFF") != -1)  {
  69.     digitalWrite(ledPin, LOW);
  70.     value = LOW;
  71.   }
  72.  
  73. // Set ledPin according to the request
  74. //digitalWrite(ledPin, value);
  75.  
  76.   // Return the response
  77.   client.println("HTTP/1.1 200 OK");
  78.   client.println("Content-Type: text/html");
  79.   client.println(""); //  do not forget this one
  80.   client.println("<!DOCTYPE HTML>");
  81.   client.println("<html>");
  82.  
  83.   client.print("Led pin is now: ");
  84.  
  85.   if(value == HIGH) {
  86.     client.print("On");
  87.   } else {
  88.     client.print("Off");
  89.   }
  90.   client.println("<br><br>");
  91.   client.println("<a href=\"/LED=ON\"\"><button>Turn On </button></a>");
  92.   client.println("<a href=\"/LED=OFF\"\"><button>Turn Off </button></a><br />");  
  93.   client.println("</html>");
  94.  
  95.   delay(1);
  96.   Serial.println("Client disonnected");
  97.   Serial.println("");
  98.  
  99. }
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