2017年10月15日 星期日

NodeMCU Web Server Showing DHT11 Data





#include <ESP8266WiFi.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

// Replace with your network details
//const char* ssid = "YOUR_NETWORK_NAME";
//const char* password = "YOUR_NETWORK_PASSWORD";
const char* ssid = "74170287";
const char* password = "24063173";

#define DHTPIN 5     // what pin we're connected to
#define DHTTYPE DHT11   // DHT 11
DHT dht(DHTPIN, DHTTYPE);

WiFiServer server(80);

void setup() 
{
  Serial.begin(115200);
  // Connect to WiFi network
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);
  dht.begin(); 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.print("Use this URL : ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");

}

void loop() 
{
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) {
    return;
  }

  // Wait until the client sends some data
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }

  // Read the first line of the request
  String request = client.readStringUntil('\r');
  Serial.println(request);
  client.flush();

  // Return the response
   client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println("Connnection: close");
  client.println();
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");
  client.println("<meta http-equiv=\"refresh\" content=\"5\">");
  client.println("<br />"); 
  client.println(""); //  do not forget this one
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) 
  {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

          client.print("Temperature (C): ");
          client.println(t, 1);  
          client.println("<br />");  


          client.print("Humidity (%): ");
          client.println(h, 0);  
          client.println("<br />");   

          client.println("</html>");
  delay(1);
  Serial.println("Client disconnected");


}

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