2018年6月8日 星期五

Read temperature and humidity from nodemcu ESP12E (WeMos D1 R2 )with DHT11 and show it on HTML webpage

Read temperature and humidity from nodemcu ESP12E (WeMos D1 R2 )with DHT11 and show it on HTML webpage(Local)-part1








//======================================
//server ex: http://192.168.1.104/data
//======================================
#include <ESP8266WiFi.h>
#include "DHT.h"
#define DHTPIN D1
#define DHTTYPE DHT11

const char* ssid = "PTS-2F";  //"your SSID or hotspot or wifi name";
const char* password = "";    //"password of hotspot or wifi or ssid";

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  delay(10);
  dht.begin();
  // Connect to WiFi network
  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");
 
  // Start the server
  server.begin();
  Serial.println("Server started");

  // Print the IP address
  Serial.println(WiFi.localIP());
  // Read the first line of the request
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  Serial.print("Humidity : ");
  Serial.print(h,2);
  Serial.print("%  Temperature: ");
  Serial.print(t,2);
  Serial.println("C");
 
 }

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
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();


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

  String req = client.readStringUntil('\r');
  Serial.println(req);
  client.flush();
 
  if (req.indexOf("/data") != -1){
    client.flush();
    client.println("HTTP/1.1 200 OK");           // This tells the browser that the request to provide data was accepted
    client.println("Access-Control-Allow-Origin: *");  //Tells the browser it has accepted its request for data from a different domain (origin).
    client.println("Content-Type: application/json;charset=utf-8");  //Lets the browser know that the data will be in a JSON format
    client.println("Server: Arduino");           // The data is coming from an Arduino Web Server (this line can be omitted)
    client.println("Connection: close");         // Will close the connection at the end of data transmission.
    client.println();                            // You need to include this blank line - it tells the browser that it has reached the end of the Server reponse header.
                               // This is tha starting bracket of the JSON data
    client.print("{\"temperature\": \"");
    client.print(t);                         
    client.print("\", \"Humidity\": \"");
    client.print(h);             
    client.print("\"}");                     
                     
  }
  else {
    client.flush();
    client.println("HTTP/1.1 200 OK");           // This tells the browser that the request to provide data was accepted
    client.println("Access-Control-Allow-Origin: *");  //Tells the browser it has accepted its request for data from a different domain (origin).
    client.println("Content-Type: application/json;charset=utf-8");  //Lets the browser know that the data will be in a JSON format
    client.println("Server: Arduino");           // The data is coming from an Arduino Web Server (this line can be omitted)
    client.println("Connection: close");         // Will close the connection at the end of data transmission.
    client.println();                            // You need to include this blank line - it tells the browser that it has reached the end of the Server reponse header.
                          // This is tha starting bracket of the JSON data
    client.print("{\"Response\": ");
    client.print("Invalid");                         
    client.print("}");                   
                       // This is the final bracket of the JSON data
  }

    delay(1);
    Serial.println("Client disonnected");

}

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