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

Introducción

Ver Introducción del Internet de las Cosas en artículo anterior.

Objetivo

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

Software

• Driver
  • CP210x USB to UART Bridge VCP Drivers
• Entorno de Desarrollo Integrado
  • Arduino IDE

Hardware

• Arduino ESP8266 NodeMCU

  $9.49 ESP8266 NodeMCU en

• Breadboard mini

  

• Led RGB

  

• Resistencias (330 ohms)

  

Diagrama de Pinout

Código

• Repositorio en Github
  • Fritzing

  

  • Arduino_ESP8266_NodeMCU_Access_Point_Web_Server_Led_RGB.fzz

• Arduino IDE

  • Tarjeta

    1. Adicionar url de tarjetas

       

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

    2. Instalar tarjeta

       

  • Configuración

    

• 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("");
  }