|
介绍:利用ESP32的WIFI模块,创建一个简单的网络服务器来控制伺服电机。
可以使用任何具有浏览器功能的设备访问要构建的网络服务器:本地网络上的智能手机,平板电脑,笔记本电脑等。
硬件:
1、零知ESP32
2、伺服电机
接线:
软件:
零知开发工具
代码:
注意:
1、代码导入之后需要根据自己的本地网络在下面的两行代码中填写无线网名称和密码!
- //找到下面两行填写WiFi名称和密码
- const char* ssid = "";
- const char* password = "";
复制代码 2、需要导入伺服电机的库文件,见附件。
- #include <WiFi.h>
- #include "Servo.h"
-
- Servo myservo; // create servo object to control a servo
- // twelve servo objects can be created on most boards
-
- // GPIO the servo is attached to
- static const int servoPin = 13;
-
- // Replace with your network credentials
- const char* ssid = "";
- const char* password = "";
-
- // Set web server port number to 80
- WiFiServer server(80);
-
- // Variable to store the HTTP request
- String header;
-
- // Decode HTTP GET value
- String valueString = String(5);
- int pos1 = 0;
- int pos2 = 0;
-
- void setup() {
- Serial.begin(9600);
- delay(1000);
- myservo.attach(servoPin); // attaches the servo on the servoPin to the servo object
-
- // 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,
- 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()) { // loop while the client's connected
- 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();
-
- // 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>body { text-align: center; font-family: "Trebuchet MS", Arial; margin-left:auto; margin-right:auto;}");
- client.println(".slider { width: 300px; }</style>");
- client.println("<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>");
-
- // Web Page
- client.println("</head><body><h1>ESP32 with Servo</h1>");
- client.println("<p>Position: <span id="servoPos"></span></p>");
- client.println("<input type="range" min="0" max="180" class="slider" id="servoSlider" onchange="servo(this.value)" value="" + valueString + ""/>");
-
- client.println("<script>var slider = document.getElementById("servoSlider");");
- client.println("var servoP = document.getElementById("servoPos"); servoP.innerHTML = slider.value;");
- client.println("slider.oninput = function() { slider.value = this.value; servoP.innerHTML = this.value; }");
- client.println("$.ajaxSetup({timeout:1000}); function servo(pos) { ");
- client.println("$.get("/?value=" + pos + "&"); {Connection: close};}</script>");
-
- client.println("</body></html>");
-
- //GET /?value=180& HTTP/1.1
- if (header.indexOf("?value=") >= 0) {
- pos1 = header.indexOf('=');
- pos2 = header.indexOf('&');
- valueString = header.substring(pos1 + 1, pos2);
-
- //Rotate the servo
- myservo.write(valueString.toInt());
- Serial.println(valueString);
- }
- // 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("");
- }
- }
复制代码
导入程序代码,在右侧选择ESP32开发板,然后验证程序,如图:
然后上传程序到开发板,打开串口调试窗口,可以看到WiFi已连接,且服务器创建成功,输出本地服务器地址:
使用手机或者电脑的浏览器连接服务器,就能够控制使用滑块控制伺服电机的转动角度了,如图所示:
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看,没有帐号?注册
x
阿莫论坛20周年了!感谢大家的支持与爱护!!
知道什么是神吗?其实神本来也是人,只不过神做了人做不到的事情 所以才成了神。 (头文字D, 杜汶泽)
|