In questo articolo inseriamo il link ad un videotutarial che consente di accendere una lampada 220 volt con un esp8266 tramite wifi utilizzando un client come Google Crome o un qualunque browser.

Occorrente:

  • NodeMCU ESP8266,   9€
  • un relè,   3€
  • cavi,   1€
  • IDE arduino,   free
  • Wifi di casa,
  • il browser.

 

 

 

 

 

 

 

 

Il server da flashare sul nodemcu

 

#include <ESP8266WiFi.h>//libreria
const char* ssid = “…….”; // mettere wifi
const char* password = “……..”;// mettere pass

; //
WiFiServer server(80);

void setup() {
Serial.begin(115200);
delay(10);
pinMode(5, OUTPUT);
pinMode(4, OUTPUT);
pinMode(0, OUTPUT);
pinMode(13, OUTPUT);
digitalWrite(5, LOW);
digitalWrite(4, LOW);
digitalWrite(0, LOW);
digitalWrite(13, LOW);

// connettersi alla rete wifi
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”);

// avvia il server
server.begin();
Serial.println(“Server started”);

// stampa l’indirizzo wifi
Serial.print(“Use this URL to connect: “);
Serial.print(“http://”);
Serial.print(WiFi.localIP());
Serial.println(“/”);

}

void loop() {
// verifica se un cliente è connesso
WiFiClient client = server.available();
if (!client) {
return;
}

// attende fino a quando il client invia alcuni dati
Serial.println(“new client”);
while(!client.available()){
delay(1);
}

// legge la prima riga della richiesta
String request = client.readStringUntil(‘\r’);
Serial.println(request);
client.flush();

// partita la richiesta

if (request.indexOf(“/light1on”) > 0) {
digitalWrite(5, HIGH);

}
if (request.indexOf(“/light1off”) >0) {
digitalWrite(5, LOW);

}

if (request.indexOf(“/light2on”) > 0) {
digitalWrite(4, HIGH);

}
if (request.indexOf(“/light2off”) >0) {
digitalWrite(4, LOW);

}
if (request.indexOf(“/light3on”) >0) {
digitalWrite(0, HIGH);

}
if (request.indexOf(“/light3off”) > 0) {
digitalWrite(0, LOW);

}
if (request.indexOf(“/light4on”) > 0) {
digitalWrite(13, HIGH);

}
if (request.indexOf(“/light4off”) > 0) {
digitalWrite(13, LOW);

}
// imposta ledPin secondo la richiesta
//digitalWrite(ledPin, value);

// 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>”);
client.println(“<meta name=’apple-mobile-web-app-capable’ content=’yes’ />”);
client.println(“<meta name=’apple-mobile-web-app-status-bar-style’ content=’black-translucent’ />”);
client.println(“</head>”);
client.println(“<body bgcolor = \”#f7e6ec\”>”);
client.println(“<hr/><hr>”);
client.println(“<h4><center> Esp8266 Electrical Device Control </center></h4>”);
client.println(“<hr/><hr>”);
client.println(“<br><br>”);
client.println(“<br><br>”);
client.println(“<center>”);
client.println(“Device 1”);
client.println(“<a href=\”/light1on\”\”><button>Turn On </button></a>”);
client.println(“<a href=\”/light1off\”\”><button>Turn Off </button></a><br />”);
client.println(“</center>”);
client.println(“<br><br>”);
client.println(“<center>”);
client.println(“Device 2”);
client.println(“<a href=\”/light2on\”\”><button>Turn On </button></a>”);
client.println(“<a href=\”/light2off\”\”><button>Turn Off </button></a><br />”);
client.println(“</center>”);
client.println(“<br><br>”);
client.println(“<center>”);
client.println(“Device 3”);
client.println(“<a href=\”/light3on\”\”><button>Turn On </button></a>”);
client.println(“<a href=\”/light3off\”\”><button>Turn Off </button></a><br />”);
client.println(“</center>”);
client.println(“<br><br>”);
client.println(“<center>”);
client.println(“Device 4”);
client.println(“<a href=\”/light4on\”\”><button>Turn On </button></a>”);
client.println(“<a href=\”/light4off\”\”><button>Turn Off </button></a><br />”);
client.println(“</center>”);
client.println(“<br><br>”);
client.println(“<center>”);
client.println(“<table border=\”5\”>”);
client.println(“<tr>”);
if (digitalRead(5))
{
client.print(“<td>Light 1 is ON</td>”);

}
else
{
client.print(“<td>Light 1 is OFF</td>”);

}

client.println(“<br />”);

if (digitalRead(4))
{
client.print(“<td>Light 2 is ON</td>”);

}
else
{

client.print(“<td>Light 2 is OFF</td>”);

}
client.println(“</tr>”);

client.println(“<tr>”);

if (digitalRead(0))

{
client.print(“<td>Light 3 is ON</td>”);

}

else

{
client.print(“<td>Light 3 is OFF</td>”);
}

if (digitalRead(13))

{

client.print(“<td>Light 4 is ON</td>”);

}

else

{

client.print(“<td>Light 4 is OFF</td>”);

}

client.println(“</tr>”);

client.println(“</table>”);

client.println(“</center>”);
client.println(“</html>”);
delay(1);
Serial.println(“Client disonnected”);
Serial.println(“”);

}

 

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