Código DoEmail.ino

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include "contents.h"

// Replace with your network credentials
const char* ssid = "?????";
const char* password = "??????";
ESP8266WebServer server(80);   //instantiate server at port 80 (http port)

String page = "";
String text = "";
double data;

void setup(void){
 pinMode(A0, INPUT);
 //pinMode(LED_BUILTIN, OUTPUT);
 delay(1000);
 Serial.begin(115200);
 WiFi.begin(ssid, password); //begin WiFi connection
 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());
 server.on("/data.txt", [](){
   text = (String)data;
   server.send(200, "text/html", text);
 });
 server.on("/data_update.js", [](){
   server.send(200, "text/html", data_update_js_str);
 });
 server.on("/", [](){
   server.send(200,"text/html", index_html_str);
});
 server.on("/LEDBlink", [](){
    server.send(200, "text/html", index_html_str);
    Serial.println("TESTANDO");
    /*    digitalWrite(LED_BUILTIN, HIGH);
    delay(1000);
    digitalWrite(LED_BUILTIN, LOW); */
});

 server.begin();
 Serial.println("Web server started!");
}

void loop(void){
 data = analogRead(A0);
 delay(100);
 server.handleClient();
}