C++ ESP32 Servo Steuerung

Mit diesem Programm steht ein WEB-Server für eine Servo-Motor Steuerung zur Verfügung. Der Servo-Motor wird mit einem Slider angesteuert. Die Position des Servos wird angezeigt.
Hardware

Die Hardware für die Servo-Steuerung

1 x ESP32 V1

1 x Servo Motor SG90
Programm

C++ ESP32 Servo Steuerung
/*

PROGRAMMINFO

Funktion: ESP32 WEB Server zur Servo-Steuerung

Version: 28.02.2021

(x) C++ Arduino IDE V1.8.13

Board: ESP36 Dev Module

Einstellungen:
https://dl.espressif.com/dl/package_esp32_index.json
http://dan.drown.org/stm32duino/package_STM32duino_index.json
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json


Librarys
- WiFi.h V0.16.1
- Servo  https://github.com/RoboticsBrno/ServoESP32
servoPin = 13;
*********/

#include <WiFi.h>
#include <Servo.h>

Servo myservo;

static const int servoPin = 13;

//PASSWORT:
const char* ssid     = "xxx";
const char* password = "xxx";

WiFiServer server(80);

String header;

String valueString = String(5);
int pos1 = 0;
int pos2 = 0;

unsigned long currentTime = millis();

unsigned long previousTime = 0;
// 2000ms = 2s)
const long timeoutTime = 2000;

void setup() {
  Serial.begin(115200);

  myservo.attach(servoPin);


  Serial.print("Connecting to ");
  Serial.println(ssid);
  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 == '
') {
          if (currentLine.length() == 0) {

            e:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();

            // HTML
            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://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js\"></script>");

            // Web Page
            client.println("</head><body><h1>ESP32 Servo-Steuerung</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>");


            if(header.indexOf("GET /?value=")>=0) {
              pos1 = header.indexOf('=');
              pos2 = header.indexOf('&');
              valueString = header.substring(pos1+1, pos2);


              myservo.write(valueString.toInt());
              Serial.println(valueString);
            }

            client.println();

            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '
') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }

    header = "";

    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}
RAW code
WEB-Server für eine Servo-Motor-Steuerung
