Wokwi - Online ESP32, STM32, Arduino Simulator

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <Servo.h>

const char* ssid = "Som";
const char* password = "1234567890";

#define LED D8    // LED at GPIO4 D2
#define SERVO_PIN D2
#define RTS_PIN D0  // RTS pin connected to GPIO0

Servo myservo;
WiFiServer server(80);

void setup() {
  pinMode(RTS_PIN, OUTPUT);

  // Trigger reset by setting RTS pin low
  digitalWrite(RTS_PIN, LOW);
  delay(100); // Hold low for a short duration
  digitalWrite(RTS_PIN, HIGH);

  Serial.begin(115200);
  Serial.println("Reset triggered via RTS pin");

  pinMode(LED, OUTPUT);
  myservo.attach(SERVO_PIN);
  myservo.write(45); // Initial position of servo
  digitalWrite(LED, LOW); // Initial state of LED

  Serial.println();
  Serial.println();
  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("........");

  server.begin();
  Serial.println("Server started at...");
  Serial.println(WiFi.localIP());
}

void loop() {
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    return;
  }

  // Wait until the client sends some data
  Serial.println("New client");
  while (!client.available()) {
    delay(1);
  }

  // Read the first line of the request
  String req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();

  // Match the request
  if (req.indexOf("/F") != -1) {
    digitalWrite(LED, LOW); // Turn off LED
    myservo.write(45);      // Move servo to locked position
  } else if (req.indexOf("/B") != -1) {
    digitalWrite(LED, HIGH); // Turn on LED
    myservo.write(180);      // Move servo to unlocked position
  }

  // Return the response
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println("Connection: close");
  client.println();

  client.println("<!DOCTYPE HTML>");
  client.println("<HTML>");
  client.println("<H1>Automatic Door Lock</H1>");
  client.println("<br />");

  client.println("<a href=\"/F\"><button style='font-size: 50px; height: 200px; width: 300px;'>LOCK</button></a>");
  client.println("<a href=\"/B\"><button style='font-size: 50px; height: 200px; width: 300px;'>UNLOCK</button></a>");

  client.println("</html>");

  delay(1);
  Serial.println("Client disconnected");
  Serial.println("");
}