linspriteio5

Summary

DHT22 module applies specific digital blocks collection technology and temperature and humidity sensing technology to ensure that products with high reliability and excellent long-term stability. Sensor comprises a capacitive humidity sensing element and a high-precision temperature component, and with a high-performance 8-bit microcontroller connected. Therefore, the product has excellent quality, fast response, anti-interference ability, high cost and so on.  Measurable temperature range of the module: -40-80 ℃ ± 0.5 ℃, humidity range: 20-90% RH ± 2% RH. The module is widely used in temperature and humidity regulator, weather station, and other relevant temperature and humidity detection control.

Material preparation

  • LinkNode D1 x 1
  • DHT22 x 1
  • DuPont line
  • Arduino IDE

Steps

1. Login linksprite.io ,record the “Device ID” and “API key” ( If there is no account, please sign up. )

  • 1. My Profile -> API key

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  • 2. My device->Create DIY Device

Enter Device Name,Device Type , Group Name , the device number is 03, device name and device grouping can be any.

linspriteio

Note: Device Type must be selected 03(Custom device type) .Click the device you created and record the “Device ID”.

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2. Edit and run the code

Modify the “apikey” and “deviceID”  with content acquired before

1

Compile the code and upload.

3.  Results

  1. Serial Monitor

 

linspriteio3    

2. LinkSprite IO

linspriteio4

 

Code

#include <ESP8266WiFi.h>
#include <WString.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h>       
  
#include "DHT.h"
  
#define DHTPIN D0     // what pin we're connected to
  
#define DHTTYPE DHT22   // DHT 22  (AM2302)
  
char *tem="";
String apikey = "162d15b0-2c6d-4d44-b288-10f28a527f96";
const char* deviceID="030000000f";
const char* server = "www.linksprite.io";
WiFiClient client;
  
  
DHT dht(DHTPIN, DHTTYPE);
  
void setup() {
  Serial.begin(9600);
  WiFiManager wifiManager;
  wifiManager.setAPStaticIPConfig(IPAddress(10,0,1,1), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
  wifiManager.autoConnect("LinkNodeAP");
  Serial.print("WiFi Connected ...\n");
  Serial.println("WiFi connected");
  Serial.println("DHTxx test!");
    
  dht.begin();
}
  
void loop() {
  
  delay(2000);
  
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // Read temperature as Celsius (the default)
  float f = dht.readTemperature(true); // Read temperature as Fahrenheit (isFahrenheit = 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");
    
  if (client.connect(server,80)) 
  {  
     String  postStr ="{";
           postStr +="\"action\":\"update\",";
           postStr +="\"apikey\":\"";
           postStr += apikey;
           postStr +="\",";
           postStr +="\"deviceid\":\"";
           postStr += deviceID;
           postStr +="\",";
           postStr +="\"params\":";
           postStr +="{";
             
           postStr +="\"temperature\":\"";
           itoa(t,tem,10); 
           postStr +=tem;
           postStr +="\",";
          
           postStr +="\"humidity\":\"";
           itoa(h,tem,10); 
           postStr +=tem;
           postStr +="\"\r\n";
           postStr +="}";
           postStr +="}";
        
    client.print("POST /api/http HTTP/1.1\n");
    client.print("Host: ");
    client.print(server);
    client.print("\nContent-Type: application/json\n");
    client.print("Content-Length: ");
    client.print(postStr.length());
    client.print("\n\n");
    client.print(postStr); 
      
    String request = "";
    delay(1000);  
    while (client.available()) 
   {
     char c = client.read();
     request +=c;
   } 
  
  if (request!= NULL)
  {
   int index1 = request.indexOf(":{");
   int index2 = request.indexOf("},");
   String param = request.substring(index1, index2 + 1);
   String data="\0" ;
   Serial.print("The param is ");
   Serial.println(param);
  
   
   client.stop();
   Serial.println("waiting ...");    
   delay(1000);  
  } 
}
  
}