View Code/*********
Rui Santos
Complete project details at randomnerdtutorials.com
*********/

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

MDNSResponder mdns;

// Replace with your network credentials
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

ESP8266WebServer server(80);

String webPage = "";

int gpio13Led = 13;
int gpio12Relay = 12;

void setup(void){
webPage += "<h1>SONOFF Web Server</h1><p><a href=\"on\"><button>ON</button></a> <a href=\"off\"><button>OFF</button></a></p>";
// preparing GPIOs
pinMode(gpio13Led, OUTPUT);
digitalWrite(gpio13Led, HIGH);

pinMode(gpio12Relay, OUTPUT);
digitalWrite(gpio12Relay, HIGH);

Serial.begin(115200);
delay(5000);
WiFi.begin(ssid, password);
Serial.println("");

// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
Serial.println(WiFi.localIP());

if (mdns.begin("esp8266", WiFi.localIP())) {
Serial.println("MDNS responder started");
}

server.on("/", [](){
server.send(200, "text/html", webPage);
});
server.on("/on", [](){
server.send(200, "text/html", webPage);
digitalWrite(gpio13Led, LOW);
digitalWrite(gpio12Relay, HIGH);
delay(1000);
});
server.on("/off", [](){
server.send(200, "text/html", webPage);
digitalWrite(gpio13Led, HIGH);
digitalWrite(gpio12Relay, LOW);
delay(1000);
});
server.begin();
Serial.println("HTTPserverstarted");
}

void loop(void){
server.handleClient();
}

View Codewarning: espcomm_sync failed
error: espcomm_open failed