WIFI05_啟動web server 利用網頁控制LED_ESP32 NodeMCU 32S

https://gist.github.com/clive520/2372dcfd2b080c37d867aa7a7eb3e540

#include <WiFi.h>

#include <WiFiMulti.h> //多個SSID自動連接library

WiFiMulti wifiMulti;

#define LED_BUILTIN 2

WiFiServer server(80);

void setup()

{

  pinMode(LED_BUILTIN, OUTPUT);

  digitalWrite(LED_BUILTIN, LOW) ;

  Serial.begin(9600);

  delay(1000);

  //寫入常用的SSID和密碼

  wifiMulti.addAP("clive_lef", "12345678");

  wifiMulti.addAP("clive_1F", "12345678");

  wifiMulti.addAP("book", "12345678");

  // 開始連接WIFI

  Serial.println("Connecting Wifi...");

  if (wifiMulti.run() == WL_CONNECTED) { //連接多個WIFI

    delay(50);

    Serial.println("");

    Serial.print("Successful Connecting to Access Point:");

    Serial.println(WiFi.SSID());

    Serial.print("SSID　Signal strength:");

    Serial.println(WiFi.RSSI());//WiFi.RSSI()訊號強度

    Serial.println("WiFi connected");

    Serial.print("IP address: ");

    Serial.println(WiFi.localIP());//WiFi.localIP()連接到的IP

    for (int count = 0; count < 5; count++) {   //成功時亮內建的LED，閃爍5次

      digitalWrite(LED_BUILTIN, HIGH) ;

      delay(500);

      digitalWrite(LED_BUILTIN, LOW) ;

      delay(500);

    }

  }

  server.begin(); //啟動web server

}

int value = 0;

void loop() {

  WiFiClient client = server.available();   // 監聽是否有人連網

  if (client) {                             // 如果有人連入,

    Serial.println("New Client.");           // 列印有人連入訊息

    String currentLine = "";                // 建立文字字串currentLine存放客戶端的傳入數據

    while (client.connected()) {            // 當客戶端還在連接時不斷重複

      if (client.available()) {             // 如果有要從客戶端有其他訊息 讀取其訊息，

        char c = client.read();             // 將訊息存入字串c

        Serial.write(c);                    // 列印出來

        if (c == '\n') {                    // if the byte is a newline character

          //建立網頁上可以看到的內容

          if (currentLine.length() == 0) {

            client.println("HTTP/1.1 200 OK");

            client.println("Content-type:text/html");

            client.println();

          if (digitalRead(2) == LOW) {client.print(" LED OFF .<br>");} 

          else {client.print(" LED ON .<br>");}   //判斷LED適量或熄滅，並於網頁顯示         

            client.print("Click <a href=\"/H\">here</a> to turn the LED on GPIo 2 on.<br>");

            client.print("Click <a href=\"/L\">here</a> to turn the LED on GPIo 2 off.<br>");//製作兩個連結去開關LED

            client.println();

            break;

          } else {   

            currentLine = "";

          }

        } else if (c != '\r') {  

          currentLine += c;      

        }

        //提取訊息，判斷要做的事情

        if (currentLine.endsWith("GET /H")) {

          digitalWrite(LED_BUILTIN, HIGH);               // GET /H turns the LED on

        }

        if (currentLine.endsWith("GET /L")) {

          digitalWrite(LED_BUILTIN, LOW);                // GET /L turns the LED off

        }

      }

    }

    // 關閉網頁連結

    client.stop();

    Serial.println("Client Disconnected.");

  }

}