Esp8266 nodemcu - get real-time weather from Suning API

Preface

        This article introduces how to use ESP8266-NodeMCU From Suning API Get real-time weather , Suning API： Click the jump

        It is shown below ：     

          What we want to capture is the content of the red line , And print through serial port . Of course , This part can also be used to display in OLED On , That's how I used to play .

        Before the official start , Need to know how to use WiFiManager Library connection wifi The process of , In the code below wifi Connection used WiFiManager library , There is nothing to connect wifi The name and password are written directly into the code , Specific operations can jump to reference ： ESP8266-NodeMCU—— Use WiFiManager Library connection wifi

One 、 Software preparation

（1）Arduino IDE

Two 、 Hardware preparation

（1）ESP8266-NodeMCU

        

（2） One that can transmit data micro USB Line

  3、 ... and 、 Implementation code

#include <WiFiManager.h>     
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

  char Json_Time[36];   // From Suning API Acquired Json data ( After parsing ) Array of 
  const String timeUrl = "http://quan.suning.com/getSysTime.do";  // Suning API Address 
  String timeMsg="";          // Grab the time part 
  String timeAfterParse=" ";  //Json Parsed valid data cache string 
  char flag;
  
String callHttp(String httpUrl);    // Capture time website Json data 
String parseJsonTime(String tjson); // analysis Json data 


void setup() 
{ 
  Serial.begin(115200);     // Serial port baud rate is set to 115200
  connectWifi();            // Connect WiFi, Only after connecting will it continue to run  

}

void loop() 
{   
      timeMsg = callHttp(timeUrl);   // obtain JSon data 
      if(timeMsg!="" )             // If the data is successfully obtained 
     { 
      timeAfterParse = parseJsonTime(timeMsg); // analysis Json data 
      timeAfterParse.toCharArray(Json_Time,timeAfterParse.length() + 1);  //Json_Time Will become an array of strings , Content and timeAfterParse equally     
      Serial.println(Json_Time);
     }  
    delay(900);
}

//================================================ Connect WiFi==================================================================
void connectWifi(){
  
WiFiManager wifiManager;
wifiManager.autoConnect("ESP8266-NodeMCU");   

}

//================================================= analysis Json The data is a string =====================================================
String parseJsonTime(String tjson){

  const size_t capacity =96;
  DynamicJsonDocument tdoc(capacity);   
  
  deserializeJson(tdoc, tjson); //  Deserialized data 
  String datetime = tdoc["sysTime2"].as<String>();  //  Get the parsed data information 
  return datetime;
}

//================================================= Capture time website Json data =====================================================
String callHttp(String httpUrl) { 
  HTTPClient hClient;   
  String message;
  hClient.begin(httpUrl);      // Connect API Address  
  
  int httpCode = hClient.GET();   // The request for Json data 
  if (httpCode > 0) {
    if (httpCode == HTTP_CODE_OK) {
      String payload = hClient.getString();   // Data transfer 
      message = payload;
    }
  } else {
    message = "[1-HTTP]failed, error:" + String(hClient.errorToString(httpCode).c_str());  // If the acquisition fails, an error will be reported 
  }
  hClient.end();   // close API
  return message;  // Return information 
}

Four 、 Realization effect

          If the network is not good, the effect may not be so ideal , You may not be able to crawl every second , But when I was testing , Seems to be API The interface itself is a card , Sometimes when you open it with a computer, it also shows timeout , I used to play very smoothly