The user is requesting the following in Spanish: 1. An ESP32 script (Arduino IDE compatible) 2. Where the ESP32 acts as a WiFi Access Point (AP) 3. Serving a web page on that AP 4. The web page has a button to open a farm gate 5. The gate is opened by driving a relay connected to pin 21 Main considerations: - ESP32 AP mode: use WiFi.softAP() - Built-in web server: WiFiServer or the WebServer library (more convenient) - Pin 21 for the relay — GPIO 21 on the ESP32 is a regular GPIO, usable for digital output (GPIO 25, 26, 27 are flash-related and can be problematic, but 21 is fine) - Relay activation: normally the relay module is active-low (the signal pin LOW activates the relay), so when opening the gate the pin should be driven LOW. This should be noted. - Since it's a gate/door (puerta de una finca), it's a temporary action — the relay should be activated for a certain time (e.g., 3–5 seconds) and then turned off. This is important so the gate doesn't stay open. - Good UX: a simple HTML page with a big "ABRIR PUERTA" button, status indicator, and maybe a cooldown to prevent accidental double-taps. Let me try writing the code: ```cpp #include #include #define RELAY_PIN 21 #define RELAY_ACTIVE_TIME 4000 // ms the relay stays ON #define WIFI_SSID "PuertaFinca" #define WIFI_PASS "12345678" // minimum 8 characters, or empty for open AP WebServer server(80); unsigned long relayTriggeredAt = 0; bool relayActive = false; unsigned long lastButtonPress = 0; // cooldown void setup() { Serial.begin(115200); pinMode(RELAY_PIN, OUTPUT); digitalWrite(RELAY_PIN, HIGH); // relay OFF (active-low module) WiFi.mode(WIFI_AP); WiFi.softAP(WIFI_SSID, WIFI_PASS); IPAddress ip = WiFi.softAPIP(); Serial.print("IP: "); Serial.println(ip); server.on("/", handleRoot); server.on("/abrir", handleOpen); server.onNotFound(handleNotFound); server.begin(); } void loop() { server.handleClient(); // auto-disable relay after RELAY_ACTIVE_TIME if (relayActive && millis() - relayTriggeredAt >= RELAY_ACTIVE_TIME) { digitalWrite(RELAY_PIN, HIGH); relayActive = false; Serial.println("Relay OFF - gate command completed"); } } ``` HTML: use a modern-looking page, big button, and maybe a countdown. A bit simpler, but nice looking. Add a cooldown to prevent the button from being mashing-mashed (e.g., 5 seconds between activations). I'll also explain the wiring: - Relay module: VCC → 3.3V or 5V, GND → GND, IN/Signal → GPIO 21 - Important note: most relay modules are active-low. If your relay module activates with HIGH, invert the logic. Also mention: connect to the "PuertaFinca" network, then open a browser at http://192.168.4.1 (the ESP32 AP default IP). Let me write the HTML with a farm-themed design — a bit greenish, a big button, and a status LED indicator. I can also add a simple status page. Also, add a `/abrir` endpoint that can be used as a URL, which is handy for testing. Should I add protection? A simple password? The user didn't ask for it. Keep it simple but maybe mention it. Actually, an access code could be nice too, but it complicates things. Keep it simple: the page works, the button opens. For security I'll mention as an optional note that you can add a passcode. Let me refine the code: ```cpp #include #include // ===== CONFIG ===== const char* SSID = "PUERTA-FINCA"; const char* PASS = "finca1234"; // min 8 chars, or NULL/"" for open AP const int RELAY_PIN = 21; const unsigned long PULSE_MS = 4000; // gate pulse duration const unsigned long COOLDOWN_MS = 6000; // min interval between two openings // ================== WebServer server(80); bool relayOn = false; unsigned long relayStart = 0; unsigned long lastOpen = 0; // HTML page const char INDEX_HTML[] = R"rawliteral( Puerta de la Finca ... )rawliteral"; ``` HTML page content: - Title "🚜 Puerta de la Finca" - Status: "Cerrada" / "Abriendo..." - Big button "ABRIR PUERTA" - The button uses fetch("/abrir") and displays the result - A small script to update the button state Handler logic: ```cpp void handleRoot() { server.send(200, "text/html", INDEX_HTML); } void handleOpen() { unsigned long now = millis(); if (now - lastOpen < COOLDOWN_MS) { server.send(200, "application/json", "{\"status\":\"wait\",\"ms\":" + String(COOLDOWN_MS - (now - lastOpen)) + "}"); return; } if (relayOn) { server.send(200, "application/json", "{\"status\":\"busy\"}"); return; } digitalWrite(RELAY_PIN, LOW); // relay ON relayOn = true; relayStart = now; lastOpen = now; Serial.println("Opening gate..."); server.send(200, "application/json", "{\"status\":\"opening\",\"ms\":" + String(PULSE_MS) + "}"); } void handleStatus() { String s = relayOn ? "open" : "closed"; server.send(200, "application/json", "{\"status\":\"" + s + "\"}"); } ``` JS on the page: ```js async function openGate() { const btn = document.getElementById('btn'); btn.disabled = true; const r = await fetch('/abrir'); const d = await r.json(); if (d.status === 'opening') { setStatus('Abriendo...', 'open'); const total = d.ms; let t = total; const iv = setInterval(() => { t -= 100; // update a small countdown text if (t <= 0) { clearInterval(iv); setStatus('Cerrada', 'closed'); btn.disabled = false; } }, 100); } else if (d.status === 'wait') { setStatus('Espera ' + (d.ms/1000).toFixed(1) + ' s', 'wait'); setTimeout(() => { btn.disabled = false; }, d.ms); } } ``` Keep it manageable. Maybe also add a small countdown to the button text. CSS: farm-themed — green/brown, large rounded buttons, clean. Wiring notes: - Relay 1 channel module: VCC to 3V3 (or 5V, modules usually work with either; with a level converter 3.3V is recommended, but many modules also work at 5V; safest to say: VCC to 3V3 or 5V according to module spec — usually 5V modules accept 3.3V on IN, but the official recommendation is… Actually many tutorials connect VCC to 5V and IN directly to the GPIO; the GPIO output is 3.3V and the module's input threshold is fine with that. To keep things safe and simple: VCC → 5V (or 3V3), GND → GND, IN → GPIO 21.) Note about active-low: most modules activate the relay when IN is LOW. My code drives it LOW for ON. If the relay doesn't activate, swap HIGH/LOW. Also note: the default IP for the ESP32 softAP is 192.168.4.1. Also worth mentioning: use the WebServer library that ships with the Arduino ESP32 core — no extra installs needed. Gate pulse: the user said "abrir la puerta... activando un rele". A 4-second pulse is typical for a sliding gate. Make it easy to configure in the #define section, and mention that if the gate opens continuously while the relay is ON, they can just press and hold or make the pulse permanent. I'll write the complete code, then wiring, usage, and customization notes. All in Spanish. Formatting: - Brief intro - Code block (complete sketch) - Wiring section - Usage instructions - Configuration/customization notes (brief) - Short troubleshooting (relay not activating → invert polarity; no IP → check WiFi) Length: the code is necessarily long. Keep the surrounding text concise. Use headers and bullet points. # Script ESP32 – Puerta de finca con Access Point Aquí tienes el script completo. El ESP32 crea su propia red WiFi, y al conectarte a ella abres un navegador en `http://192.168.4.1` para ver la página con el botón de apertura. ```cpp #include #include // =================== CONFIGURACIÓN =================== const char* WIFI_SSID = "PUERTA-FINCA"; const char* WIFI_PASS = "finca1234"; // mín. 8 caracteres ("" = sin contraseña) const int RELAY_PIN = 21; // pin del relé const unsigned long PULSE_MS = 4000; // duración del pulso para abrir (ms) const unsigned long COOLDOWN_MS = 6000; // pausa mínima entre aperturas (ms) // ===================================================== WebServer server(80); bool relayOn = false; unsigned long relayStart = 0; unsigned long lastOpen = 0; // ------------------- PÁGINA WEB ------------------- const char INDEX_HTML[] = R"rawliteral( Puerta de la Finca

🚜 Puerta de la Finca

Control de acceso

Puerta cerrada

ESP32 · AP: PUERTA-FINCA

)rawliteral"; // --------------------------------------------------- void setup() { Serial.begin(115200); // El relé se activa con LOW (módulos de relé típicos) pinMode(RELAY_PIN, OUTPUT); digitalWrite(RELAY_PIN, HIGH); // relé en reposo = OFF // Crear el Access Point WiFi.mode(WIFI_AP); WiFi.softAP(WIFI_SSID, WIFI_PASS); Serial.print("Accediendo a la web en: http://"); Serial.println(WiFi.softAPIP()); // normalmente 192.168.4.1 server.on("/", HTTP_GET, handleRoot); server.on("/abrir", HTTP_GET, handleAbrir); server.onNotFound([](){ server.send(404, "text/plain", "Ruta no encontrada"); }); server.begin(); Serial.println("Servidor web iniciado."); } void loop() { server.handleClient(); // Corte automático del pulso del relé if (relayOn && millis() - relayStart >= PULSE_MS) { digitalWrite(RELAY_PIN, HIGH); relayOn = false; Serial.println("Relé apagado. Ciclo completado."); } } void handleRoot() { server.send(200, "text/html", INDEX_HTML); } void handleAbrir() { unsigned long now = millis(); // En pleno pulso if (relayOn) { server.send(200, "application/json", "{\"status\":\"wait\",\"ms\":" + String(PULSE_MS - (now - relayStart)) + "}"); return; } // En pausa anti-repetición if (now - lastOpen < COOLDOWN_MS) { server.send(200, "application/json", "{\"status\":\"wait\",\"ms\":" + String(COOLDOWN_MS - (now - lastOpen)) + "}"); return; } digitalWrite(RELAY_PIN, LOW); // relé ON relayOn = true; relayStart = now; lastOpen = now; Serial.println("¡ABIENDO PUERTA!"); server.send(200, "application/json", "{\"status\":\"opening\",\"ms\":" + String(PULSE_MS) + "}"); } ``` ## 🔌 Conexiones | Módulo de relé | ESP32 | |---|---| | **VCC** | 3V3 (o 5V) | | **GND** | GND | | **IN / Signal** | **GPIO 21** | Luego alimentas con 12V/230V según tu módulo de puerta. ## 📱 Cómo usarlo 1. Sube el sketch desde Arduino IDE (con la placa ESP32 seleccionada). 2. En tu móvil, busca la red WiFi **PUERTA-FINCA** y conéctate con la contraseña `finca1234`. 3. Abre el navegador y entra en **http://192.168.4.1** 4. Pulsa **ABRIR PUERTA** → el relé se activa durante el tiempo definido. ## ⚙️ Ajustes útiles - **Si tu relé no se activa:** cambia `LOW` por `HIGH` en los `digitalWrite` (algunos módulos son de lógica alta). - **Duración del pulso:** modifica `PULSE_MS` (4000 = 4 segundos, típico para puerta corredera). - **Botón y URL directa:** también puedes abrir `http://192.168.4.1/abrir` en el navegador para activar el relé sin pasar por la página (útil para probar). - **Seguridad:** al ser un AP abierto en tu finca, cualquiera que se acerque con el móvil lo podría ver. Si quieres, puedo añadirte un código PIN que pedir antes de abrir la puerta. ¿Quieres que le añada el PIN de acceso, un log de aperturas o que el botón mantenga el relé activo mientras lo sostienes?

crea un script para un esp32 ( para programarlo desde arduin...