ESP32学习之JSON,和接入心知天气
注意：手机热点或者网络不能开5.0GHz频段和WIFI6，不然ESP32连不上
心知天气账号（免费版即可），网站：心知天气 - 高精度气象数据 - 天气数据API接口 - 行业气象解决方案 (seniverse.com)
V3的用户手册-天气实况：天气实况 (yuque.com)
返回的json数据：
怎么接入？
怎么构建请求？
比如这个：
根据官方提供的API，然后自己填入相关参数进行构建
看官方提供的手册
然后再看他提供的API接口。
这是接口地址，看参数说明，然后自己按要求填写
代码一（24小时的，没有预测）:
#include
#include
#include
#include
#include
#include
void TandW();
void httpRequest(String reqRes,int stat);
void connectWiFi();
void parseInfo_now(WiFiClient client,int i);
void parseInfo_fut(WiFiClient client,int i);
unsigned int localPort = 8888; // 用于侦听UDP数据包的本地端口
WiFiClient clientNULL;
//网络校时的相关配置
static const char ntpServerName[] = "ntp1.aliyun.com"; //NTP服务器，使用阿里云
int timeZone = 8; //时区设置，采用东8区
//保存断网前的最新数据
int results_0_now_temperature_int_old;
String results_0_now_text_str_old;
int results_0_daily_1_high_int_old;
int results_0_daily_1_low_int_old;
String results_0_daily_1_text_day_str_old;
//----------WIFI连接配置----------
const char* ssid = "your ssid"; // 连接WiFi名（此处使用XXX为示例）
const char* password = "your password"; // 连接WiFi密码（此处使用12345678为示例）
// 请将您需要连接的WiFi密码填入引号中
//----------天气API配置----------
const char* host = "api.seniverse.com"; // 将要连接的服务器地址
const int httpPort = 80; // 将要连接的服务器端口
// 心知天气HTTP请求所需信息
String reqUserKey = "your secret key"; // 私钥
String reqLocation = "jiujiang"; // 城市
String reqUnit = "c";
WiFiMulti wifiMulti;
WiFiClient client;
void setup() {
Serial.begin(115200);
connectWiFi();
}
void loop() {
TandW();
delay(5000);
}
void TandW(){
String reqRes = "/v3/weather/now.json?key=" + reqUserKey +
+ "&location=" + reqLocation +
"&language=en&unit=" +reqUnit;
// 向心知天气服务器服务器请求信息并对信息进行解析
httpRequest(reqRes,0);
//延迟，需要低于20次/分钟
delay(5000);
}
// 向心知天气服务器服务器请求信息并对信息进行解析
void httpRequest(String reqRes,int stat){
WiFiClient client;
// 建立http请求信息
String httpRequest = String("GET ") + reqRes + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n";
Serial.println("");
Serial.print("Connecting to ");
Serial.print(host);
// 尝试连接服务器
if (client.connect(host, 80)){
Serial.println(" Success!");
// 向服务器发送http请求信息
client.print(httpRequest);
Serial.println("Sending request: ");
Serial.println(httpRequest);
// 获取并显示服务器响应状态行
String status_response = client.readStringUntil('\n');
Serial.print("status_response: ");
Serial.println(status_response);
// 使用find跳过HTTP响应头
if (client.find("\r\n\r\n")) {
Serial.println("Found Header End. Start Parsing.");
}
if (stat == 0){
// 利用ArduinoJson库解析心知天气响应信息(实时数据)
parseInfo_now(client,1);
}else if(stat == 1){
parseInfo_fut(client,1);
}
}
else {
Serial.println(" connection failed!");
if (stat == 0){
// 利用ArduinoJson库解析心知天气响应信息(实时数据)
parseInfo_now(clientNULL,0);
}else if(stat == 1){
parseInfo_fut(clientNULL,0);
}
}
//断开客户端与服务器连接工作
client.stop();
}
// 连接WiFi
void connectWiFi(){
WiFi.begin(ssid, password); // 启动网络连接
Serial.print("Connecting to "); // 串口监视器输出网络连接信息
Serial.print(ssid); Serial.println(" ..."); // 告知用户NodeMCU正在尝试WiFi连接
int i = 0; // 这一段程序语句用于检查WiFi是否连接成功
while (WiFi.status() != WL_CONNECTED) { // WiFi.status()函数的返回值是由NodeMCU的WiFi连接状态所决定的。
delay(1000); // 如果WiFi连接成功则返回值为WL_CONNECTED
Serial.print(i++); Serial.print(' '); // 此处通过While循环让NodeMCU每隔一秒钟检查一次WiFi.status()函数返回值
} // 同时NodeMCU将通过串口监视器输出连接时长读秒。
// 这个读秒是通过变量i每隔一秒自加1来实现的。
Serial.println(""); // WiFi连接成功后
Serial.println("Connection established!"); // NodeMCU将通过串口监视器输出"连接成功"信息。
Serial.print("IP address: "); // 同时还将输出NodeMCU的IP地址。这一功能是通过调用
Serial.println(WiFi.localIP()); // WiFi.localIP()函数来实现的。该函数的返回值即NodeMCU的IP地址。
}
// 利用ArduinoJson库解析心知天气响应信息(实时)
void parseInfo_now(WiFiClient client,int i){
if(i==1){
const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_OBJECT_SIZE(1) + 2*JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(6) + 230;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, client);
JsonObject results_0 = doc["results"][0];
JsonObject results_0_now = results_0["now"];
const char* results_0_now_text = results_0_now["text"]; // "Sunny"
const char* results_0_now_code = results_0_now["code"]; // "0"
const char* results_0_now_temperature = results_0_now["temperature"]; // "32"
const char* results_0_last_update = results_0["last_update"]; // "2020-06-02T14:40:00+08:00"
// 通过串口监视器显示以上信息
String results_0_now_text_str = results_0_now["text"].as();
int results_0_now_code_int = results_0_now["code"].as();
int results_0_now_temperature_int = results_0_now["temperature"].as();
String results_0_last_update_str = results_0["last_update"].as();
Serial.println(F("======Weahter Now======="));
Serial.print(F("Weather Now: "));
Serial.print(results_0_now_text_str);
Serial.print(F(" "));
Serial.println(results_0_now_code_int);
Serial.print(F("Temperature: "));
Serial.println(results_0_now_temperature_int);
Serial.print(F("Last Update: "));
Serial.println(results_0_last_update_str);
Serial.println(F("========================"));
//display_0(results_0_now_temperature_int,results_0_now_text_str);
results_0_now_text_str_old = results_0_now_text_str;
results_0_now_temperature_int_old = results_0_now_temperature_int;
}
else{
//display_0(results_0_now_temperature_int_old,results_0_now_text_str_old);
}
}
// 利用ArduinoJson库解析心知天气响应信息(预测)
void parseInfo_fut(WiFiClient client,int i){
if(i==1){
const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(3) + JSON_OBJECT_SIZE(1) + JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(6) + 3*JSON_OBJECT_SIZE(14) + 860;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, client);
JsonObject results_0 = doc["results"][0];
JsonArray results_0_daily = results_0["daily"];
JsonObject results_0_daily_0 = results_0_daily[0];
const char* results_0_daily_0_date = results_0_daily_0["date"];
const char* results_0_daily_0_text_day = results_0_daily_0["text_day"];
const char* results_0_daily_0_code_day = results_0_daily_0["code_day"];
const char* results_0_daily_0_text_night = results_0_daily_0["text_night"];
const char* results_0_daily_0_code_night = results_0_daily_0["code_night"];
const char* results_0_daily_0_high = results_0_daily_0["high"];
const char* results_0_daily_0_low = results_0_daily_0["low"];
const char* results_0_daily_0_rainfall = results_0_daily_0["rainfall"];
const char* results_0_daily_0_precip = results_0_daily_0["precip"];
const char* results_0_daily_0_wind_direction = results_0_daily_0["wind_direction"];
const char* results_0_daily_0_wind_direction_degree = results_0_daily_0["wind_direction_degree"];
const char* results_0_daily_0_wind_speed = results_0_daily_0["wind_speed"];
const char* results_0_daily_0_wind_scale = results_0_daily_0["wind_scale"];
const char* results_0_daily_0_humidity = results_0_daily_0["humidity"];
JsonObject results_0_daily_1 = results_0_daily[1];
const char* results_0_daily_1_date = results_0_daily_1["date"];
const char* results_0_daily_1_text_day = results_0_daily_1["text_day"];
const char* results_0_daily_1_code_day = results_0_daily_1["code_day"];
const char* results_0_daily_1_text_night = results_0_daily_1["text_night"];
const char* results_0_daily_1_code_night = results_0_daily_1["code_night"];
const char* results_0_daily_1_high = results_0_daily_1["high"];
const char* results_0_daily_1_low = results_0_daily_1["low"];
const char* results_0_daily_1_rainfall = results_0_daily_1["rainfall"];
const char* results_0_daily_1_precip = results_0_daily_1["precip"];
const char* results_0_daily_1_wind_direction = results_0_daily_1["wind_direction"];
const char* results_0_daily_1_wind_direction_degree = results_0_daily_1["wind_direction_degree"];
const char* results_0_daily_1_wind_speed = results_0_daily_1["wind_speed"];
const char* results_0_daily_1_wind_scale = results_0_daily_1["wind_scale"];
const char* results_0_daily_1_humidity = results_0_daily_1["humidity"];
JsonObject results_0_daily_2 = results_0_daily[2];
const char* results_0_daily_2_date = results_0_daily_2["date"];
const char* results_0_daily_2_text_day = results_0_daily_2["text_day"];
const char* results_0_daily_2_code_day = results_0_daily_2["code_day"];
const char* results_0_daily_2_text_night = results_0_daily_2["text_night"];
const char* results_0_daily_2_code_night = results_0_daily_2["code_night"];
const char* results_0_daily_2_high = results_0_daily_2["high"];
const char* results_0_daily_2_low = results_0_daily_2["low"];
const char* results_0_daily_2_rainfall = results_0_daily_2["rainfall"];
const char* results_0_daily_2_precip = results_0_daily_2["precip"];
const char* results_0_daily_2_wind_direction = results_0_daily_2["wind_direction"];
const char* results_0_daily_2_wind_direction_degree = results_0_daily_2["wind_direction_degree"];
const char* results_0_daily_2_wind_speed = results_0_daily_2["wind_speed"];
const char* results_0_daily_2_wind_scale = results_0_daily_2["wind_scale"];
const char* results_0_daily_2_humidity = results_0_daily_2["humidity"];
const char* results_0_last_update = results_0["last_update"];
// 从以上信息中摘选几个通过串口监视器显示
String results_0_daily_0_date_str = results_0_daily_0["date"].as();
String results_0_daily_0_text_day_str = results_0_daily_0["text_day"].as();
int results_0_daily_0_code_day_int = results_0_daily_0["code_day"].as();
String results_0_daily_0_text_night_str = results_0_daily_0["text_night"].as();
int results_0_daily_0_code_night_int = results_0_daily_0["code_night"].as();
int results_0_daily_0_high_int = results_0_daily_0["high"].as();
int results_0_daily_0_low_int = results_0_daily_0["low"].as();
String results_0_last_update_str = results_0["last_update"].as();
int results_0_daily_1_high_int = results_0_daily_1["high"].as();
int results_0_daily_1_low_int = results_0_daily_1["low"].as();
String results_0_daily_1_text_day_str = results_0_daily_1["text_day"].as();
Serial.println(F("======Today Weahter ======="));
Serial.print(F("DATE: "));
Serial.println(results_0_daily_0_date_str);
Serial.print(F("Day Weather: "));
Serial.print(results_0_daily_0_text_day_str);
Serial.print(F(" "));
Serial.println(results_0_daily_0_code_day_int);
Serial.print(F("Night Weather: "));
Serial.print(results_0_daily_0_text_night_str);
Serial.print(F(" "));
Serial.println(results_0_daily_0_code_night_int);
Serial.print(F("High: "));
Serial.println(results_0_daily_0_high_int);
Serial.print(F("LOW: "));
Serial.println(results_0_daily_0_low_int);
Serial.print(F("Last Update: "));
Serial.println(results_0_last_update_str);
Serial.println(F("=============================="));
// display_1(results_0_daily_1_high_int,results_0_daily_1_low_int,results_0_daily_1_text_day_str);
results_0_daily_1_high_int_old=results_0_daily_1_high_int;
results_0_daily_1_low_int_old=results_0_daily_1_low_int;
results_0_daily_1_text_day_str_old=results_0_daily_1_text_day_str;
}else{
// display_1(results_0_daily_1_high_int_old,results_0_daily_1_low_int_old,results_0_daily_1_text_day_str_old);
}
} 结果：
代码二（有预测）:
#include
#include
#include
#include
#include
#include
void TandW();
void httpRequest(String reqRes,int stat);
void connectWiFi();
void parseInfo_now(WiFiClient client,int i);
void parseInfo_fut(WiFiClient client,int i);
unsigned int localPort = 8888; // 用于侦听UDP数据包的本地端口
WiFiClient clientNULL;
//网络校时的相关配置
static const char ntpServerName[] = "ntp1.aliyun.com"; //NTP服务器，使用阿里云
int timeZone = 8; //时区设置，采用东8区
//保存断网前的最新数据
int results_0_now_temperature_int_old;
String results_0_now_text_str_old;
int results_0_daily_1_high_int_old;
int results_0_daily_1_low_int_old;
String results_0_daily_1_text_day_str_old;
//----------WIFI连接配置----------
const char* ssid = "your ssid"; // 连接WiFi名（此处使用XXX为示例）
const char* password = "your password"; // 连接WiFi密码（此处使用12345678为示例）
// 请将您需要连接的WiFi密码填入引号中
//----------天气API配置----------
const char* host = "api.seniverse.com"; // 将要连接的服务器地址
const int httpPort = 80; // 将要连接的服务器端口
// 心知天气HTTP请求所需信息
String reqUserKey = "your secret key"; // 私钥
String reqLocation = "jiujiang"; // 城市
String reqUnit = "c";
WiFiMulti wifiMulti;
WiFiClient client;
void setup() {
Serial.begin(115200);
connectWiFi();
}
void loop() {
TandW();
delay(5000);
}
void TandW(){
String reqRes = "/v3/weather/daily.json?key=" + reqUserKey +
+ "&location=" + reqLocation +
"&language=en&unit=" +reqUnit+"&start=0&days=3";
// 向心知天气服务器服务器请求信息并对信息进行解析
httpRequest(reqRes,1);
//延迟，需要低于20次/分钟
delay(5000);
}
// 向心知天气服务器服务器请求信息并对信息进行解析
void httpRequest(String reqRes,int stat){
WiFiClient client;
// 建立http请求信息
String httpRequest = String("GET ") + reqRes + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n";
Serial.println("");
Serial.print("Connecting to ");
Serial.print(host);
// 尝试连接服务器
if (client.connect(host, 80)){
Serial.println(" Success!");
// 向服务器发送http请求信息
client.print(httpRequest);
Serial.println("Sending request: ");
Serial.println(httpRequest);
// 获取并显示服务器响应状态行
String status_response = client.readStringUntil('\n');
Serial.print("status_response: ");
Serial.println(status_response);
// 使用find跳过HTTP响应头
if (client.find("\r\n\r\n")) {
Serial.println("Found Header End. Start Parsing.");
}
if (stat == 0){
// 利用ArduinoJson库解析心知天气响应信息(实时数据)
parseInfo_now(client,1);
}else if(stat == 1){
parseInfo_fut(client,1);
}
}
else {
Serial.println(" connection failed!");
if (stat == 0){
// 利用ArduinoJson库解析心知天气响应信息(实时数据)
parseInfo_now(clientNULL,0);
}else if(stat == 1){
parseInfo_fut(clientNULL,0);
}
}
//断开客户端与服务器连接工作
client.stop();
}
// 连接WiFi
void connectWiFi(){
WiFi.begin(ssid, password); // 启动网络连接
Serial.print("Connecting to "); // 串口监视器输出网络连接信息
Serial.print(ssid); Serial.println(" ..."); // 告知用户NodeMCU正在尝试WiFi连接
int i = 0; // 这一段程序语句用于检查WiFi是否连接成功
while (WiFi.status() != WL_CONNECTED) { // WiFi.status()函数的返回值是由NodeMCU的WiFi连接状态所决定的。
delay(1000); // 如果WiFi连接成功则返回值为WL_CONNECTED
Serial.print(i++); Serial.print(' '); // 此处通过While循环让NodeMCU每隔一秒钟检查一次WiFi.status()函数返回值
} // 同时NodeMCU将通过串口监视器输出连接时长读秒。
// 这个读秒是通过变量i每隔一秒自加1来实现的。
Serial.println(""); // WiFi连接成功后
Serial.println("Connection established!"); // NodeMCU将通过串口监视器输出"连接成功"信息。
Serial.print("IP address: "); // 同时还将输出NodeMCU的IP地址。这一功能是通过调用
Serial.println(WiFi.localIP()); // WiFi.localIP()函数来实现的。该函数的返回值即NodeMCU的IP地址。
}
// 利用ArduinoJson库解析心知天气响应信息(实时)
void parseInfo_now(WiFiClient client,int i){
if(i==1){
const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_OBJECT_SIZE(1) + 2*JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(6) + 230;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, client);
JsonObject results_0 = doc["results"][0];
JsonObject results_0_now = results_0["now"];
const char* results_0_now_text = results_0_now["text"]; // "Sunny"
const char* results_0_now_code = results_0_now["code"]; // "0"
const char* results_0_now_temperature = results_0_now["temperature"]; // "32"
const char* results_0_last_update = results_0["last_update"]; // "2020-06-02T14:40:00+08:00"
// 通过串口监视器显示以上信息
String results_0_now_text_str = results_0_now["text"].as();
int results_0_now_code_int = results_0_now["code"].as();
int results_0_now_temperature_int = results_0_now["temperature"].as();
String results_0_last_update_str = results_0["last_update"].as();
Serial.println(F("======Weahter Now======="));
Serial.print(F("Weather Now: "));
Serial.print(results_0_now_text_str);
Serial.print(F(" "));
Serial.println(results_0_now_code_int);
Serial.print(F("Temperature: "));
Serial.println(results_0_now_temperature_int);
Serial.print(F("Last Update: "));
Serial.println(results_0_last_update_str);
Serial.println(F("========================"));
//display_0(results_0_now_temperature_int,results_0_now_text_str);
results_0_now_text_str_old = results_0_now_text_str;
results_0_now_temperature_int_old = results_0_now_temperature_int;
}
else{
//display_0(results_0_now_temperature_int_old,results_0_now_text_str_old);
}
}
// 利用ArduinoJson库解析心知天气响应信息(预测)
void parseInfo_fut(WiFiClient client,int i){
if(i==1){
const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(3) + JSON_OBJECT_SIZE(1) + JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(6) + 3*JSON_OBJECT_SIZE(14) + 860;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, client);
JsonObject results_0 = doc["results"][0];
JsonArray results_0_daily = results_0["daily"];
JsonObject results_0_daily_0 = results_0_daily[0];
const char* results_0_daily_0_date = results_0_daily_0["date"];
const char* results_0_daily_0_text_day = results_0_daily_0["text_day"];
const char* results_0_daily_0_code_day = results_0_daily_0["code_day"];
const char* results_0_daily_0_text_night = results_0_daily_0["text_night"];
const char* results_0_daily_0_code_night = results_0_daily_0["code_night"];
const char* results_0_daily_0_high = results_0_daily_0["high"];
const char* results_0_daily_0_low = results_0_daily_0["low"];
const char* results_0_daily_0_rainfall = results_0_daily_0["rainfall"];
const char* results_0_daily_0_precip = results_0_daily_0["precip"];
const char* results_0_daily_0_wind_direction = results_0_daily_0["wind_direction"];
const char* results_0_daily_0_wind_direction_degree = results_0_daily_0["wind_direction_degree"];
const char* results_0_daily_0_wind_speed = results_0_daily_0["wind_speed"];
const char* results_0_daily_0_wind_scale = results_0_daily_0["wind_scale"];
const char* results_0_daily_0_humidity = results_0_daily_0["humidity"];
JsonObject results_0_daily_1 = results_0_daily[1];
const char* results_0_daily_1_date = results_0_daily_1["date"];
const char* results_0_daily_1_text_day = results_0_daily_1["text_day"];
const char* results_0_daily_1_code_day = results_0_daily_1["code_day"];
const char* results_0_daily_1_text_night = results_0_daily_1["text_night"];
const char* results_0_daily_1_code_night = results_0_daily_1["code_night"];
const char* results_0_daily_1_high = results_0_daily_1["high"];
const char* results_0_daily_1_low = results_0_daily_1["low"];
const char* results_0_daily_1_rainfall = results_0_daily_1["rainfall"];
const char* results_0_daily_1_precip = results_0_daily_1["precip"];
const char* results_0_daily_1_wind_direction = results_0_daily_1["wind_direction"];
const char* results_0_daily_1_wind_direction_degree = results_0_daily_1["wind_direction_degree"];
const char* results_0_daily_1_wind_speed = results_0_daily_1["wind_speed"];
const char* results_0_daily_1_wind_scale = results_0_daily_1["wind_scale"];
const char* results_0_daily_1_humidity = results_0_daily_1["humidity"];
JsonObject results_0_daily_2 = results_0_daily[2];
const char* results_0_daily_2_date = results_0_daily_2["date"];
const char* results_0_daily_2_text_day = results_0_daily_2["text_day"];
const char* results_0_daily_2_code_day = results_0_daily_2["code_day"];
const char* results_0_daily_2_text_night = results_0_daily_2["text_night"];
const char* results_0_daily_2_code_night = results_0_daily_2["code_night"];
const char* results_0_daily_2_high = results_0_daily_2["high"];
const char* results_0_daily_2_low = results_0_daily_2["low"];
const char* results_0_daily_2_rainfall = results_0_daily_2["rainfall"];
const char* results_0_daily_2_precip = results_0_daily_2["precip"];
const char* results_0_daily_2_wind_direction = results_0_daily_2["wind_direction"];
const char* results_0_daily_2_wind_direction_degree = results_0_daily_2["wind_direction_degree"];
const char* results_0_daily_2_wind_speed = results_0_daily_2["wind_speed"];
const char* results_0_daily_2_wind_scale = results_0_daily_2["wind_scale"];
const char* results_0_daily_2_humidity = results_0_daily_2["humidity"];
const char* results_0_last_update = results_0["last_update"];
// 从以上信息中摘选几个通过串口监视器显示
String results_0_daily_0_date_str = results_0_daily_0["date"].as();
String results_0_daily_0_text_day_str = results_0_daily_0["text_day"].as();
int results_0_daily_0_code_day_int = results_0_daily_0["code_day"].as();
String results_0_daily_0_text_night_str = results_0_daily_0["text_night"].as();
int results_0_daily_0_code_night_int = results_0_daily_0["code_night"].as();
int results_0_daily_0_high_int = results_0_daily_0["high"].as();
int results_0_daily_0_low_int = results_0_daily_0["low"].as();
String results_0_last_update_str = results_0["last_update"].as();
int results_0_daily_1_high_int = results_0_daily_1["high"].as();
int results_0_daily_1_low_int = results_0_daily_1["low"].as();
String results_0_daily_1_text_day_str = results_0_daily_1["text_day"].as();
Serial.println(F("======Today Weahter ======="));
Serial.print(F("DATE: "));
Serial.println(results_0_daily_0_date_str);
Serial.print(F("Day Weather: "));
Serial.print(results_0_daily_0_text_day_str);
Serial.print(F(" "));
Serial.println(results_0_daily_0_code_day_int);
Serial.print(F("Night Weather: "));
Serial.print(results_0_daily_0_text_night_str);
Serial.print(F(" "));
Serial.println(results_0_daily_0_code_night_int);
Serial.print(F("High: "));
Serial.println(results_0_daily_0_high_int);
Serial.print(F("LOW: "));
Serial.println(results_0_daily_0_low_int);
Serial.print(F("Last Update: "));
Serial.println(results_0_last_update_str);
Serial.println(F("=============================="));
// display_1(results_0_daily_1_high_int,results_0_daily_1_low_int,results_0_daily_1_text_day_str);
results_0_daily_1_high_int_old=results_0_daily_1_high_int;
results_0_daily_1_low_int_old=results_0_daily_1_low_int;
results_0_daily_1_text_day_str_old=results_0_daily_1_text_day_str;
}else{
// display_1(results_0_daily_1_high_int_old,results_0_daily_1_low_int_old,results_0_daily_1_text_day_str_old);
}
} 结果：
代码三（自己写的-有预测）：
#include
#include
#include
#include
#include
#include
void TandW();
void httpRequest(String reqRes,int stat);
void connectWiFi();
//----------WIFI连接配置----------
const char* ssid = "your ssid"; // 连接WiFi名（此处使用XXX为示例）
const char* password = "your password"; // 连接WiFi密码（此处使用12345678为示例）
// 请将您需要连接的WiFi密码填入引号中
//----------天气API配置----------
const char* host = "api.seniverse.com"; // 将要连接的服务器地址
const int httpPort = 80; // 将要连接的服务器端口
// 心知天气HTTP请求所需信息
String reqUserKey = "your secret key"; // 私钥
String reqLocation = "jiujiang"; // 城市
String reqUnit = "c";
WiFiClient client;
void setup() {
Serial.begin(115200);
connectWiFi();
}
void loop() {
TandW();
delay(5000);
}
void TandW(){
String reqRes = "/v3/weather/daily.json?key=" + reqUserKey +
+ "&location=" + reqLocation +
"&language=en&unit=" +reqUnit+"&start=0&days=3";
// 向心知天气服务器服务器请求信息并对信息进行解析
httpRequest(reqRes,0);
//延迟，需要低于20次/分钟
delay(5000);
}
// 向心知天气服务器服务器请求信息并对信息进行解析
void httpRequest(String reqRes,int stat){
WiFiClient client;
// 建立http请求信息
String httpRequest = String("GET ") + reqRes + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n";
Serial.println("");
Serial.print("Connecting to ");
Serial.print(host);
// 尝试连接服务器
if (client.connect(host, 80)){
Serial.println(" Success!");
// 向服务器发送http请求信息
client.print(httpRequest);
Serial.println("Sending request: ");
Serial.println(httpRequest);
// 获取并显示服务器响应状态行
String status_response = client.readStringUntil('\n');
Serial.print("status_response: ");
Serial.println(status_response);
// 使用find跳过HTTP响应头
if (client.find("\r\n\r\n")) {
Serial.println("Found Header End. Start Parsing.");
}
const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_ARRAY_SIZE(3) + JSON_OBJECT_SIZE(1) + JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(6) + 3*JSON_OBJECT_SIZE(14) + 860;
DynamicJsonDocument doc(capacity);
deserializeJson(doc, client);
JsonObject results_0 = doc["results"][0];
JsonArray results_0_now = results_0["daily"];
JsonObject results_0_now_1 = results_0_now[1];//0为当天的日期，1为明天的日期
const char* results_0_now_text = results_0_now_1["date"];
Serial.println(results_0_now_text);
}
else {
Serial.println(" connection failed!");
}
//断开客户端与服务器连接工作
client.stop();
}
// 连接WiFi
void connectWiFi(){
WiFi.begin(ssid, password); // 启动网络连接
Serial.print("Connecting to "); // 串口监视器输出网络连接信息
Serial.print(ssid); Serial.println(" ..."); // 告知用户NodeMCU正在尝试WiFi连接
int i = 0; // 这一段程序语句用于检查WiFi是否连接成功
while (WiFi.status() != WL_CONNECTED) { // WiFi.status()函数的返回值是由NodeMCU的WiFi连接状态所决定的。
delay(1000); // 如果WiFi连接成功则返回值为WL_CONNECTED
Serial.print(i++); Serial.print(' '); // 此处通过While循环让NodeMCU每隔一秒钟检查一次WiFi.status()函数返回值
} // 同时NodeMCU将通过串口监视器输出连接时长读秒。
// 这个读秒是通过变量i每隔一秒自加1来实现的。
Serial.println(""); // WiFi连接成功后
Serial.println("Connection established!"); // NodeMCU将通过串口监视器输出"连接成功"信息。
Serial.print("IP address: "); // 同时还将输出NodeMCU的IP地址。这一功能是通过调用
Serial.println(WiFi.localIP()); // WiFi.localIP()函数来实现的。该函数的返回值即NodeMCU的IP地址。
}
四.扩展知识
JSON数据解析：
博客：使用ESP8266配合ArduinoJson库来解析JSON信息_json_array_size_20161201的博客-CSDN博客
arduino JSON数据信息解析_一入极客深似海的博客-CSDN博客
json就是用[]一层套一层
JsonObject results_0 = doc["results"][0];
JsonArray results_0_daily = results_0["daily"];
JsonObject results_0_daily_0 = results_0_daily[0];
const char* results_0_daily_0_date = results_0_daily_0["date"];
const char* results_0_daily_0_text_day = results_0_daily_0["text_day"];
const char* results_0_daily_0_code_day = results_0_daily_0["code_day"];
const char* results_0_daily_0_text_night = results_0_daily_0["text_night"];
const char* results_0_daily_0_code_night = results_0_daily_0["code_night"];
const char* results_0_daily_0_high = results_0_daily_0["high"];
const char* results_0_daily_0_low = results_0_daily_0["low"];
const char* results_0_daily_0_rainfall = results_0_daily_0["rainfall"];
const char* results_0_daily_0_precip = results_0_daily_0["precip"];
const char* results_0_daily_0_wind_direction = results_0_daily_0["wind_direction"];
const char* results_0_daily_0_wind_direction_degree = results_0_daily_0["wind_direction_degree"];
const char* results_0_daily_0_wind_speed = results_0_daily_0["wind_speed"];
const char* results_0_daily_0_wind_scale = results_0_daily_0["wind_scale"];
const char* results_0_daily_0_humidity = results_0_daily_0["humidity"];
JsonObject results_0_daily_1 = results_0_daily[1];
const char* results_0_daily_1_date = results_0_daily_1["date"];
const char* results_0_daily_1_text_day = results_0_daily_1["text_day"];
const char* results_0_daily_1_code_day = results_0_daily_1["code_day"];
const char* results_0_daily_1_text_night = results_0_daily_1["text_night"];
const char* results_0_daily_1_code_night = results_0_daily_1["code_night"];
const char* results_0_daily_1_high = results_0_daily_1["high"];
const char* results_0_daily_1_low = results_0_daily_1["low"];
const char* results_0_daily_1_rainfall = results_0_daily_1["rainfall"];
const char* results_0_daily_1_precip = results_0_daily_1["precip"];
const char* results_0_daily_1_wind_direction = results_0_daily_1["wind_direction"];
const char* results_0_daily_1_wind_direction_degree = results_0_daily_1["wind_direction_degree"];
const char* results_0_daily_1_wind_speed = results_0_daily_1["wind_speed"];
const char* results_0_daily_1_wind_scale = results_0_daily_1["wind_scale"];
const char* results_0_daily_1_humidity = results_0_daily_1["humidity"];
JsonObject results_0_daily_2 = results_0_daily[2];
const char* results_0_daily_2_date = results_0_daily_2["date"];
const char* results_0_daily_2_text_day = results_0_daily_2["text_day"];
const char* results_0_daily_2_code_day = results_0_daily_2["code_day"];
const char* results_0_daily_2_text_night = results_0_daily_2["text_night"];
const char* results_0_daily_2_code_night = results_0_daily_2["code_night"];
const char* results_0_daily_2_high = results_0_daily_2["high"];
const char* results_0_daily_2_low = results_0_daily_2["low"];
const char* results_0_daily_2_rainfall = results_0_daily_2["rainfall"];
const char* results_0_daily_2_precip = results_0_daily_2["precip"];
const char* results_0_daily_2_wind_direction = results_0_daily_2["wind_direction"];
const char* results_0_daily_2_wind_direction_degree = results_0_daily_2["wind_direction_degree"];
const char* results_0_daily_2_wind_speed = results_0_daily_2["wind_speed"];
const char* results_0_daily_2_wind_scale = results_0_daily_2["wind_scale"];
const char* results_0_daily_2_humidity = results_0_daily_2["humidity"];
const char* results_0_last_update = results_0["last_update"]; 
看上面的博客，上面的这段代码结合图片也就懂了。
参考博客：利用ESP8266+OLED（I2C）打造智能时钟（网络校时+实时天气+天气预报）_esp8266oled制作天气时钟_下雪还是下雨的博客-CSDN博客