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玩转 ESP8266 + ArduinoJSON库(V6版本)

2021-02-15 14:33:33 作者：互联网

玩转 ESP8266 + ArduinoJSON库(V6版本)

好多人在制作气象站的时候，可能遇到过json数据不知道如何处理的问题，今天专门拿气象json数据为例来介绍是如何处理的。

一.以和风气象数据为例：

材料：和风官网提供的API数据；
请求URL
实况天气 HTTP GET

开发版 https://devapi.qweather.com/v7/weather/now?{请求参数}
3天预报 HTTP GET
开发版 https://devapi.qweather.com/v7/weather/3d?{请求参数}
（关于账号和apikey自己申请，自备，每个人可以免费注册，申请获得3个免费的apikey。）

实况天气

1.准备好的访问的api：

https://devapi.qweather.com/v7/weather/now?location=101010100&key=xxx
// 请将示例请求URL中的KEY更换成你自己的KEY

2.将api复制粘贴到浏览器中，回车；

返回的数据：

{"code":"200","updateTime":"2021-02-15T13:26+08:00","fxLink":"http://hfx.link/2ax1","now":{"obsTime":"2021-02-15T13:00+08:00","temp":"3","feelsLike":"-2","icon":"100","text":"晴","wind360":"225","windDir":"西南风","windScale":"3","windSpeed":"16","humidity":"20","precip":"0.0","pressure":"1029","vis":"30","cloud":"0","dew":"-18"},"refer":{"sources":["Weather China"],"license":["no commercial use"]}}

3.将以上数据拷贝下来;

利用Arduinojson官网提供的在线数据转换；网址

在这里插入图片描述

选择好版本之后，点击类型选择；

在这里插入图片描述

至于Mode和Input type不知道如何选择，就默认即可，然后点击NEXT:JSON
将刚刚拷贝的数据，粘贴到Input方框里面，然后点击，右下角的NEXT:Size

在这里插入图片描述

这里会计算json数据的大小，这个信息可以帮助我们申请存放json的内存大小，相当的方便，一目了然。
点击右下角的：NEXT:Program
到这里，网站已经帮我们序列化并生成好了代码

// Stream& input;

StaticJsonDocument<768> doc;
DeserializationError error = deserializeJson(doc, input);

if (error) {
  Serial.print(F("deserializeJson() failed: "));
  Serial.println(error.f_str());
  return;
}

const char* code = doc["code"]; // "200"
const char* updateTime = doc["updateTime"]; // "2021-02-15T13:26+08:00"
const char* fxLink = doc["fxLink"]; // "http://hfx.link/2ax1"

JsonObject now = doc["now"];
const char* now_obsTime = now["obsTime"]; // "2021-02-15T13:00+08:00"
const char* now_temp = now["temp"]; // "3"
const char* now_feelsLike = now["feelsLike"]; // "-2"
const char* now_icon = now["icon"]; // "100"
const char* now_text = now["text"]; // "晴"
const char* now_wind360 = now["wind360"]; // "225"
const char* now_windDir = now["windDir"]; // "西南风"
const char* now_windScale = now["windScale"]; // "3"
const char* now_windSpeed = now["windSpeed"]; // "16"
const char* now_humidity = now["humidity"]; // "20"
const char* now_precip = now["precip"]; // "0.0"
const char* now_pressure = now["pressure"]; // "1029"
const char* now_vis = now["vis"]; // "30"
const char* now_cloud = now["cloud"]; // "0"
const char* now_dew = now["dew"]; // "-18"

const char* refer_sources_0 = doc["refer"]["sources"][0]; // "Weather China"
const char* refer_license_0 = doc["refer"]["license"][0]; // "no commercial use"

我们并不需要全部拷贝下来，只需要拷贝我们所需要的信息即可。
例如：

StaticJsonDocument<768> doc;//用来申请存放json数据的内存容量
JsonObject now = doc["now"];//给存放数据容器定义一个名字。
const char* now_temp = now["temp"]; // "3"//查找关键字信息，下面同是，不做赘述。
const char* now_feelsLike = now["feelsLike"]; // "-2"
const char* now_icon = now["icon"]; // "100"
const char* now_text = now["text"]; // "晴"
const char* now_wind360 = now["wind360"]; // "225"
const char* now_windDir = now["windDir"]; // "西南风"
const char* now_windScale = now["windScale"]; // "3"
const char* now_windSpeed = now["windSpeed"]; // "16"
const char* now_humidity = now["humidity"]; // "20"
const char* now_precip = now["precip"]; // "0.0"
const char* now_pressure = now["pressure"]; // "1029"
const char* now_vis = now["vis"]; // "30"
const char* now_cloud = now["cloud"]; // "0"
const char* now_dew = now["dew"]; // "-18"

以上获取的数据基本可以满足我们所需的相关数据了，至于如何在程序里面被调用，那就看你自己怎么写了。
这里给出相关的GET函数参考；

void HeFeng::doUpdateCurr(CurrentData *data, String HEFENG_KEY, String HEFENG_LOCATION) {  //获取实时天气状况

  std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);
  client->setInsecure();
  HTTPClient https;
  String url = "https://devapi.qweather.com/v7/weather/now?lang=en&location=" + HEFENG_LOCATION + "&key=" + HEFENG_KEY + "&gzip=n";//V7版本
   Serial.print("[HTTPS] begin...now\n");

  if (https.begin(*client, url)) {  // HTTPS
    // start connection and send HTTP header
    int httpCode = https.GET();
    // httpCode will be negative on error
    if (httpCode > 0) {
      // HTTP header has been send and Server response header has been handled
      Serial.printf("[HTTPS] GET... code: %d\n", httpCode);

      if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
        String json = https.getString();
        Serial.println(json); //打印json数据
        EEPROM.begin(96);
        DynamicJsonDocument doc1(780);
        deserializeJson(doc1, json);
        JsonObject root = doc1["now"];
        byte now_temp = root["temp"];//获取当天温度
        byte Read_temp = EEPROM.read(30);
        if (Read_temp != now_temp) {
          EEPROM.write(30, now_temp); 

          EEPROM.end();               //写入flash，并且释放内存空间
        }
        Serial.println(now_temp, DEC);
        data->tmp = now_temp;

        String now_feelsLike = root["feelsLike"];
        //Serial.println(now_feelsLike);
        data->fl = now_feelsLike;//获取体感温度

        byte now_humidity = root["humidity"];//获取湿度
        byte Read_humidity = EEPROM.read(40);
        if (Read_humidity != now_humidity) {
          EEPROM.write(40, now_humidity);            
          EEPROM.commit();
          EEPROM.end();    //写入flash，并且释放内存空间
        }
        Serial.println(now_humidity, DEC);
        data->hum = now_humidity;

        byte now_windScale = root["windScale"];//获取风力大小
        byte Read_windScale = EEPROM.read(40);
        if (Read_windScale != now_windScale) {
          EEPROM.write(50, now_windScale);             
          EEPROM.commit();
              }
        Serial.println(now_windScale, DEC);
        data->wind_sc = now_windScale;

        String now_icon = root["icon"];//获取天气图标代码
        char now_icon0[4];
        strcpy(now_icon0, now_icon.c_str()); //把String now_icon赋值给char now_icon0;
        int address = 80;
        for (int i = 0; i < strlen(now_icon0); i++) { //now_icon0长度传递给eeprom寄存address;
          address++;
          EEPROM.write(address, now_icon0[i]);
        }
        EEPROM.commit();
        EEPROM.end();     //写入flash，并且释放内存空间
        String meteoconIcon = getMeteoconIcon(now_icon);
        String now_text = root["text"];
        Serial.println(now_text);
        data->cond_txt = now_text;
        data->iconMeteoCon = meteoconIcon;
        void clear();//清除JsonDocument并释放内存空间
      }
    } else {
      EEPROM.begin(96);
      Serial.printf("[HTTPS] GET... failed, error: %s\n", https.errorToString(httpCode).c_str());
      byte now_temp0 = EEPROM.read(30);
      data->tmp = now_temp0;
      EEPROM.commit();
      String temp0 = "Temp:" + now_temp0;
      Serial.println(temp0);

      //data->tmp = 0;
      data->fl = "-1";
      byte hum0 = EEPROM.read(40);
      data->hum = hum0;
      EEPROM.commit();
       String hum1 = "Hum:" + hum0;
      Serial.println(hum1);
      //data->hum = 0;
      byte wind_sc0 = EEPROM.read(50);
      data->wind_sc = wind_sc0;
      EEPROM.commit();
      String wind_SC = "Wind:" + wind_sc0;
      Serial.println(wind_SC);
      int address = 80;
      char now_icon1[4];
      for (int i = 0; i < 3; i++) { //now_icon0长度传递给eeprom寄存address;
        address++;
        now_icon1[i] = EEPROM.read(address );
      }
      EEPROM.end();                          //写入flash，并且释放内存空间
      String meteoconIcon = getMeteoconIcon(now_icon1);
      data->iconMeteoCon = meteoconIcon;
      data->cond_txt = "eeprom";
    }

    https.end();
  } else {
    EEPROM.begin(96);
    Serial.printf("[HTTPS] Unable to connect\n");
    byte now_temp0 = EEPROM.read(30);
    data->tmp = now_temp0;
    EEPROM.commit();
    Serial.println("Temp:" + now_temp0);
    //data->tmp = 0;
    data->fl = "-1";
    byte hum0 = EEPROM.read(40);
    data->hum = hum0;
    EEPROM.commit();
    //EEPROM.end();                          //写入flash，并且释放内存空间
    Serial.println("Hum0:" + hum0);
    //data->hum = 0;
    byte wind_sc0 = EEPROM.read(50);
    data->wind_sc = wind_sc0;
    EEPROM.commit();
    // EEPROM.end();                          //写入flash，并且释放内存空间
    Serial.println("wind_sc0:" + wind_sc0);
    // data->wind_sc = 0;
    data->cond_txt = "eeprom";//无网络就将气象名称显示eeprom字样以区别有网络状态
    int address = 80;
    char now_icon1[4];
    for (int i = 0; i < 3; i++) { //now_icon0长度传递给eeprom寄存address;
      address++;
      now_icon1[i] = EEPROM.read(address);
    }
    EEPROM.commit();//提交
    EEPROM.end();      //写入flash，并且释放内存空间
    String meteoconIcon = getMeteoconIcon(now_icon1);
    data->iconMeteoCon = meteoconIcon;
  }

}

标签：const,ESP8266,char,V6,Serial,now,data,ArduinoJSON,EEPROM
来源： https://blog.csdn.net/weixin_42880082/article/details/113815396