NodeMCU ESP 32 正在永远加载“......”并且没有可用的连接

如何解决NodeMCU ESP 32 正在永远加载“......”并且没有可用的连接

我目前正在做 NodeMCU lproject。这是我第一次做将控制伺服电机的 NodeMCU 项目。所以我有一个问题：每当我运行代码时，它都可以正常工作并且我没有看到问题。主要问题是，每当我打开串行监视器 115200 时，我总是收到一条永远“. . . . . . . . . . . . . .”的消息但它没有任何我可以加入的连接。之前，我设法从文件> 示例> WiFi> WiFi 接入点连接并运行示例代码，此代码有效。我可以自由地打开和关闭我的 LED，但现在我没有收到这个新代码的连接

我已经连续看了 5 分钟，但它仍然和那个一样。根据我之前看到的链接，它说我的互联网连接应该是 2.4GHz，但我连接到了 2.4GHz WiFi（见图），但问题仍然存在。

硬件：ESP-32 DevKitC ESP32 Nodemcu 板： -NodeMCU-32s -ESP32s 开发模块 -Node32s *我尝试更换电路板以确保但我看不到任何进展... 我的代码：

#include <WiFi.h>
#include <ESP32Servo.h>
#include <WiFiClient.h>
#include <WiFiAP.h>

Servo myservo;  // create servo object to control a servo

// Servo GPIO pin
static const int servoPin = 18;

// Network credentials
const char* ssid     = "yyyyyyy";
const char* password = "xxxxxxx";

// Web server on port 80 (http)
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;

// 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() {
  ESP32PWM::allocateTimer(0);
  ESP32PWM::allocateTimer(1);
  ESP32PWM::allocateTimer(2);
  ESP32PWM::allocateTimer(3);
  myservo.setPeriodHertz(50);
  myservo.attach(servoPin,500,2400);
  Serial.begin(115200);
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.hostname("Est-Host");
  WiFi.begin(ssid,password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}

void loop(){
  WiFiClient client = server.available();   
  if (client) {                             
    currentTime = millis();
    previousTime = currentTime;
    Serial.println("New Client."); 
    String currentLine = ""; 
    while (client.connected() && currentTime - previousTime <= timeoutTime) { 
      currentTime = millis();
      if (client.available()) {            
        char c = client.read();             
        Serial.write(c);                    
        header += c;
        if (c == '\n') {
          if (currentLine.length() == 0) {
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            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:,\">");
            client.println("<style>body { text-align: center; font-family: \"Trebuchet MS\",Arial; margin-left:auto; margin-right:auto; }");
            client.println(".slider { -webkit-appearance: none; width: 300px; height: 25px; border-radius: 10px; background: #ffffff; outline: none;  opacity: 0.7;-webkit-transition: .2s;  transition: opacity .2s;}");
            client.println(".slider::-webkit-slider-thumb {-webkit-appearance: none; appearance: none; width: 35px; height: 35px; border-radius: 50%; background: #ff3410; cursor: pointer; }</style>");
            client.println("<script src=\"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js\"></script>");
            client.println("</head><body style=\"background-color:#70cfff;\"><h1 style=\"color:#ff3410;\">Servo Control</h1>");
            client.println("<h2 style=\"color:#ffffff;\">Position: <span id=\"servoPos\"></span>&#176;</h2>"); 
            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>");     
            if(header.indexOf("GET /?value=")>=0) {
              pos1 = header.indexOf('=');
              pos2 = header.indexOf('&');
              valueString = header.substring(pos1+1,pos2);
              myservo.write(valueString.toInt());
              Serial.print("Val =");
              Serial.println(valueString); 
            }         
            client.println();
            break;
          } else { 
            currentLine = "";
          }
        } else if (c != '\r') {  
          currentLine += c;     
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}

NodeMCU ESP 32 正在永远加载“......”并且没有可用的连接

如何解决NodeMCU ESP 32 正在永远加载“......”并且没有可用的连接

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