Adafruit Feather HUZZAH with ESP8266 WiFi

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

#define DHTPIN 2                                    // what digital pin we're connected to
const char* ssid = "XXXXXX";                        // Wireless SID
const char* password = "XXXXXXXXXX";                // Wireless Passcode

ESP8266WebServer server(80);

const int led = 13;

// #define DHTTYPE DHT11                            // DHT 11
#define DHTTYPE DHT22                               // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21                             // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.

DHT dht(DHTPIN, DHTTYPE);

WiFiClient  client;
unsigned int myChannelNumber = XXXXXX;           // Channel Number from                                                   // ThingSpeak IoT
const char * myWriteAPIKey = "InsertAPIKey";     // Write API Key
                                                 // fom ThingSpeak IoT
void handleRoot() 
    {
    digitalWrite(led, 1);
    delay(1000);
    server.send(200, "text/plain", "hello from esp8266!");
    digitalWrite(led, 0);
    delay(1000);
    }

void handleNotFound()
    {
    digitalWrite(led, 1);
    String message = "File Not Found\n\n";
    message += "URI: ";
    message += server.uri();
    message += "\nMethod: ";
    message += (server.method() == HTTP_GET)?"GET":"POST";
    message += "\nArguments: ";
    message += server.args();
    message += "\n";
   
    for (uint8_t i=0; i<server.args(); i++)
        {
        message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
        }
    
    server.send(404, "text/plain", message);
    digitalWrite(led, 0);
    }

void setup(void)
    {
    Serial.println("AM2302 test!");
    dht.begin();

    pinMode(led, OUTPUT);
    digitalWrite(led, 0);
    Serial.begin(115200);
    WiFi.begin(ssid, password);
    ThingSpeak.begin(client);
    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")) 
        {
        Serial.println("MDNS responder started");
        }

    server.on("/", handleRoot);

    server.on("/inline", [](){
    server.send(200, "text/plain", "this works as well");
  });

    server.onNotFound(handleNotFound);

    server.begin();
    Serial.println("HTTP server started");
    }

void loop(void)
    {
    server.handleClient();
     // Wait 60 seconds between measurements.
    delay(60000);

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
    float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
    float t = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
    float f = dht.readTemperature(true);

  // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t) || isnan(f)) 
        {
        Serial.println("Failed to read from DHT sensor!");
        return;
        }

    float hif = dht.computeHeatIndex(f, h);         // Compute heat index in Fahrenheit (the default)
    float hic = dht.computeHeatIndex(t, h, false);  // Compute heat index in Celsius (isFahreheit = false)

    Serial.print("Humidity: ");
    Serial.print(h);
    Serial.print(" %\t");
    Serial.print("Temperature: ");
    Serial.print(t);
    Serial.print(" *C ");
    Serial.print(f);
    Serial.print(" *F\t");
    Serial.print("Heat index: ");
    Serial.print(hic);
    Serial.print(" *C ");
    Serial.print(hif);
    Serial.println(" *F");
    
    ThingSpeak.setField(1, t);
    ThingSpeak.setField(2, f);
    ThingSpeak.setField(3, h);
    ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
    }