Arduino ESP8266 NodeMCU en modo de Punto de Acceso con Servidor Web para controlar un Led RGB

Actualizado: 2 minuto de lectura

Introducci贸n

Ver Introducci贸n del Internet de las Cosas en art铆culo anterior.

Objetivo

Demostrar como utilizar el Arduino ESP8266 NodeMCU como Punto de Acceso con Servidor Web para Controlar un Led RGB.

Software

Hardware

  • Arduino ESP8266 NodeMCU

    $9.49 ESP8266 NodeMCU en https://www.amazon.com/

  • Breadboard mini

  • Led RGB

  • Resistencias (330 ohms)

Diagrama de Pinout

C贸digo

  • Repositorio en Github
    • Fritzing

  • Arduino IDE

    • Tarjeta

      1. Adicionar url de tarjetas

        http://arduino.esp8266.com/stable/package_esp8266com_index.json

      2. Instalar tarjeta

    • Configuraci贸n

  • Arduino_ESP8266_NodeMCU_Access_Point_Web_Server_Led_RGB

    /*
    Arduino_ESP8266_NodeMCU_Access_Point_Web_Server_Led_RGB.c 
    v0.0.1 - 2019-02-21 - nelbren.com
    */
    #include <ESP8266WiFi.h>
    #include <WiFiClient.h>
    #include <ESP8266WebServer.h>
        
    const char* ssid = "ESPWebServer";
    const char* password = "12345678";
    
    WiFiServer server(80);
    
    int ledRed =   D0; // D0 = GPIO16
    int ledGreen = D1; // D1 = GPIO05
    int ledBlue =  D2; // D2 = GPIO04
    
    int estado = 0;
    char *msg;
    
    void setup(void){
      Serial.begin(9600);
      Serial.println("");
      WiFi.mode(WIFI_AP);
      WiFi.softAP(ssid, password);
        
      IPAddress myIP = WiFi.softAPIP(); //Get IP address
      Serial.print("HotSpt IP:");
      Serial.println(myIP);
    
      pinMode(ledGreen, OUTPUT);
      digitalWrite(ledGreen, HIGH);
    
      pinMode(ledBlue, OUTPUT);
      digitalWrite(ledBlue, HIGH);
    
      pinMode(ledRed, OUTPUT);
      digitalWrite(ledRed, HIGH);
    
      server.begin();
      Serial.println("HTTP server started");
    }
    
    void red(void) {
      digitalWrite(ledRed, HIGH);
      digitalWrite(ledGreen, LOW);
      digitalWrite(ledBlue, LOW);
      Serial.println("RED!");
    }
    
    void green(void) {
      digitalWrite(ledGreen, HIGH);
      digitalWrite(ledRed, LOW);
      digitalWrite(ledBlue, LOW);
      Serial.println("GREEN!");
    }
    
    void yellow(void) {
      digitalWrite(ledRed, HIGH);
      digitalWrite(ledGreen, HIGH);
      digitalWrite(ledBlue, LOW);
      Serial.println("YELLOW!");
    }
    
    void blue(void) {
      digitalWrite(ledBlue, HIGH);
      digitalWrite(ledRed, LOW);
      digitalWrite(ledGreen, LOW);
      Serial.println("BLUE!");
    }
    
    void white(void) {
      digitalWrite(ledBlue, HIGH);
      digitalWrite(ledRed, HIGH);
      digitalWrite(ledGreen, HIGH);  
      Serial.println("WHITE!");
    }
    
    void black(void) {
      digitalWrite(ledRed, LOW);
      digitalWrite(ledGreen, LOW);
      digitalWrite(ledBlue, LOW);
      Serial.println("BLACK!");
    }
    
    void demo(void) {
      Serial.println("DEMO:");
      for(int i = 0; i < 6; i++) {
        switch (i) {
          case 0: red(); break;
          case 1: green(); break;
          case 2: yellow(); break;
          case 3: blue(); break;
          case 4: white(); break;
          case 5: black(); break;
        }
        delay(1000);
      }
    }
    
    void loop(void){
      WiFiClient client = server.available();
      if (!client) {
        return;
      }
    
      Serial.println("new client");
    
      while(client.connected() && !client.available())
      {
        delay(1);
      }
    
      String request = client.readStringUntil('\r');
      Serial.println(request);
      client.flush();
    
      String mode = "";
          
      if (request.indexOf("/BLACK") != -1) {
        black();
        mode = "BLACK";
      }
    
      if (request.indexOf("/RED") != -1) {
        red();
        mode = "RED";
      }
          
      if (request.indexOf("/GREEN") != -1) {
        green();
        mode = "GREEN";
      }
          
      if (request.indexOf("/YELLOW") != -1) {
        yellow();
        mode = "YELLOW";
      }
          
      if (request.indexOf("/BLUE") != -1) {
        blue();
        mode = "BLUE";
      }
          
      if (request.indexOf("/WHITE") != -1) {
        white();
        mode = "WHITE";
      }
    
      if (request.indexOf("/DEMO") != -1) {
        demo();
        mode = "DEMO";
      }
    
      // Return the response
      client.println("HTTP/1.1 200 OK");
      client.println("Content-Type: text/html");
      client.println(""); // do not forget this one
      client.println("<!DOCTYPE HTML>");
      client.println("<html>");
    
      //client.println("<head><meta http-equiv='refresh' content='1'></head>");
    
      if (mode == "") {
        client.println("<h1>MODE: Waiting for instructions from Cyberdyne Systems</h1>");
      } else {  
        client.println("<h1>MODE: ");
        client.println(mode);
        client.println("</h1>");
      }
      client.println("<hr>");
      client.println("<h2>");
      client.println("<a href=\"/RED\">RED</a><br>");
      client.println("<a href=\"/GREEN\">GREEN</a><br>");
      client.println("<a href=\"/YELLOW\">YELLOW</a><br>");
      client.println("<a href=\"/BLUE\">BLUE</a><br>");
      client.println("<a href=\"/WHITE\">WHITE</a><br>");
      client.println("<a href=\"/BLACK\">BLACK</a><br>");
      client.println("<br>");
      client.println("<a href=\"/DEMO\">DEMO</a><br>");
      client.println("</h2>");
      client.println("<hr>");
      client.println("<center>");
      client.println("<h3><a href='https://nelbren.com'>nelbren.com</a>&copy;2019</h3>");
      client.println("</center>");
      client.println("</html>");
    
      delay(1);
      Serial.println("Client disconnected");
      Serial.println("");
    }