01 ESP32 Web Server

(2019/07/09)

昨天看到一篇文章是利用ESP32來架設Web Server，而且介紹的很仔細，應該照著做就可以完成，所以就照著做吧！由於這方面我也只一位入門者，只會照著做，把所做的記錄下來，這樣下次就不會忘記！參考資料內有詳細的說明，再等大家去尋寶！有興趣者再自己加深加廣吧！

一、參考資料：ESP32 Web Server – Arduino IDE

二、ESP32在Arduino IDE 的環境建置 (讓Arduino IDE認識ESP32板子)

開啟Arduino IDE
點選 檔案/偏好設定
將 https://dl.espressif.com/dl/package_esp32_index.json 放到【額外的開發板管理員網址】的空格下，由於我之前已安裝了ESP8266板子，所以空格內已有一串網址，因此按右邊的圖案，讓我們把上面網址加到第二列(如下圖)，其實整個建置過程與安裝ESP8266的方式一樣！
點選 工具/開發板/開發板管理

安裝ESP32套件
- 先輸入ESP32來搜尋
  - 安裝完成

三、接上 Web:bit (Bpi:bit)板子

點選 工具/開發板，找到BPI:BIT板子
點選 序列埠，找到連接BPI:BIT板子的埠 (要先安裝CH340的驅動程式)

四、認識Web:bit的腳位

到【BPI-Bit STEAM 教育开发板】的資料網頁，找到如下的資料

由上可知P0相當於GPIO25、P1相當於GPIO32、P0相當於GPIO33...

五、架設Web:bit的網頁伺服器(Web Server)

程式直接一字不漏的COPY參考資料的程式，如下，並修改一點點資料(紅色所示)
- 1. /*********
  2. Rui Santos
  3. Complete project details at https://randomnerdtutorials.com
  4. *********/
  5. // Load Wi-Fi library
  6. #include <WiFi.h>
  7. // Replace with your network credentials

1. const char* ssid = "CC1"; //更換為可連上網的SSID及密碼
2. const char* password = "075565940";
  1. // Set web server port number to 80
  2. WiFiServer server(80);
  3. // Variable to store the HTTP request
  4. String header;
  5. // Auxiliar variables to store the current output state
  6. String output26State = "off";
  7. String output27State = "off";
  8. // Assign output variables to GPIO pins
3. const int output26 = 32; //改為 P1的腳位(GPIO32)
4. const int output27 = 33; //改為 P2的腳位(GPIO33)

- 1. void setup() {
  2. Serial.begin(115200);
  3. // Initialize the output variables as outputs
  4. pinMode(output26, OUTPUT);
  5. pinMode(output27, OUTPUT);
  6. // Set outputs to LOW
  7. digitalWrite(output26, LOW);
  8. digitalWrite(output27, LOW);
  9. // Connect to Wi-Fi network with SSID and password
  10. Serial.print("Connecting to ");
  11. Serial.println(ssid);
  12. WiFi.begin(ssid, password);
  13. while (WiFi.status() != WL_CONNECTED) {
  14. delay(500);
  15. Serial.print(".");
  16. }
  17. // Print local IP address and start web server
  18. Serial.println("");
  19. Serial.println("WiFi connected.");
  20. Serial.println("IP address: ");
  21. Serial.println(WiFi.localIP());
  22. server.begin();
  23. }
  24. void loop(){
  25. WiFiClient client = server.available(); // Listen for incoming clients
  26. if (client) { // If a new client connects,
  27. Serial.println("New Client."); // print a message out in the serial port
  28. String currentLine = ""; // make a String to hold incoming data from the client
  29. while (client.connected()) { // loop while the client's connected
  30. if (client.available()) { // if there's bytes to read from the client,
  31. char c = client.read(); // read a byte, then
  32. Serial.write(c); // print it out the serial monitor
  33. header += c;
  34. if (c == '\n') { // if the byte is a newline character
  35. // if the current line is blank, you got two newline characters in a row.
  36. // that's the end of the client HTTP request, so send a response:
  37. if (currentLine.length() == 0) {
  38. // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
  39. // and a content-type so the client knows what's coming, then a blank line:
  40. client.println("HTTP/1.1 200 OK");
  41. client.println("Content-type:text/html");
  42. client.println("Connection: close");
  43. client.println();
  45. // turns the GPIOs on and off
  46. if (header.indexOf("GET /26/on") >= 0) {
  47. Serial.println("GPIO 26 on");
  48. output26State = "on";
  49. digitalWrite(output26, HIGH);
  50. } else if (header.indexOf("GET /26/off") >= 0) {
  51. Serial.println("GPIO 26 off");
  52. output26State = "off";
  53. digitalWrite(output26, LOW);
  54. } else if (header.indexOf("GET /27/on") >= 0) {
  55. Serial.println("GPIO 27 on");
  56. output27State = "on";
  57. digitalWrite(output27, HIGH);
  58. } else if (header.indexOf("GET /27/off") >= 0) {
  59. Serial.println("GPIO 27 off");
  60. output27State = "off";
  61. digitalWrite(output27, LOW);
  62. }
  64. // Display the HTML web page
  65. client.println("<!DOCTYPE html><html>");
  66. client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
  67. client.println("<link rel=\"icon\" href=\"data:,\">");
  68. // CSS to style the on/off buttons
  69. // Feel free to change the background-color and font-size attributes to fit your preferences
  70. client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
  71. client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
  72. client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
  73. client.println(".button2 {background-color: #555555;}</style></head>");
  75. // Web Page Heading
  76. client.println("<body><h1>ESP32 Web Server</h1>");
  78. // Display current state, and ON/OFF buttons for GPIO 26
  79. client.println("<p>GPIO 26 - State " + output26State + "</p>");
  80. // If the output26State is off, it displays the ON button
  81. if (output26State=="off") {
  82. client.println("<p><a href=\"/26/on\"><button class=\"button\">ON</button></a></p>");
  83. } else {
  84. client.println("<p><a href=\"/26/off\"><button class=\"button button2\">OFF</button></a></p>");
  85. }
  87. // Display current state, and ON/OFF buttons for GPIO 27
  88. client.println("<p>GPIO 27 - State " + output27State + "</p>");
  89. // If the output27State is off, it displays the ON button
  90. if (output27State=="off") {
  91. client.println("<p><a href=\"/27/on\"><button class=\"button\">ON</button></a></p>");
  92. } else {
  93. client.println("<p><a href=\"/27/off\"><button class=\"button button2\">OFF</button></a></p>");
  94. }
  95. client.println("</body></html>");
  97. // The HTTP response ends with another blank line
  98. client.println();
  99. // Break out of the while loop
  100. break;
  101. } else { // if you got a newline, then clear currentLine
  102. currentLine = "";
  103. }
  104. } else if (c != '\r') { // if you got anything else but a carriage return character,
  105. currentLine += c; // add it to the end of the currentLine
  106. }
  107. }
  108. }
  109. // Clear the header variable
  110. header = "";
  111. // Close the connection
  112. client.stop();
  113. Serial.println("Client disconnected.");
  114. Serial.println("");
  115. }
  116. }

將上面程式燒錄(上傳)到web:bit板子

開啟右上角的【序列埠監控視窗】
- 鮑速選115200
- 會顯示我們Web:bit的IP(待會連線用)

六、透過手機連上Web:bit的網頁伺服器(Web Server)

首先手機先透過WIFI連上同一個AP (同一個網段)
手機瀏覽器輸入網址 (本例是192.168.2.113)
- 遠端控制亮滅燈

- 測試成功
- 由於我是一位入門者，只會照著做，把所做的記錄下來，這樣下次就不會忘記！參考資料內有詳細的說明，再等大家去尋寶！

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