利用Arduino Esp8266 心知天气API 获取天气预报信息（修改后可以DIY一个小型的桌面气象台）

前期准备：

注册心知天气，获取API密钥 https://www.seniverse.com

生成API请求地址，北京今天和未来4天的预报请求地址如下：

https://api.seniverse.com/v3/weather/daily.json?key=your_API
_key&location=beijing&language=zh-Hans&unit=c&start=0&days=5

需要的库：

// Libraries
#include <ESP8266WiFi.h>
#include <ArduinoJson.h>

ArduinoJson提供的在线助手很好用，帮助生成很多解析代码。https://arduinojson.org/v5/assistant/

程序流程如下：

代码如下：

// Libraries
#include <ESP8266WiFi.h>
#include <ArduinoJson.h> //使用ArduinoJson库
// WiFi settings
const char* ssid     = "***";
const char* password = "***";
// API server
const char* host = "api.seniverse.com";
void setup() {// SerialSerial.begin(115200);delay(10);// We start by connecting to a WiFi networkSerial.println();Serial.println();Serial.print("Connecting to WIFI");Serial.println(ssid);WiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED) {delay(1000);Serial.print(".");}Serial.println("");Serial.println("WiFi connected");Serial.println("IP address: ");Serial.println(WiFi.localIP());
}
void loop() {// Connect to APISerial.print("connecting to XinZhi");Serial.println(host);// Use WiFiClient class to create TCP connectionsWiFiClient client;const int httpPort = 80;if (!client.connect(host, httpPort)) {Serial.println("connection failed");return;}// We now create a URI for the requestString url = "/v3/weather/daily.json?key=your-key&location=shanghai&language=zh-Hans&unit=c&start=0&days=3";Serial.print("Requesting URL: ");Serial.println(url);// This will send the request to the serverclient.print(String("GET ") + url + " HTTP/1.1\r\n" +"Host: " + host + "\r\n" +"Connection: close\r\n\r\n");delay(100);// Read all the lines of the reply from server and print them to SerialString weather_data;while (client.available()) {String line = client.readStringUntil('\r');weather_data += line;}client.stop();Serial.println();Serial.println("closing connection");// Process weather_jsonSerial.println();//Serial.println("weather_data: ");// Serial.println(weather_data);// Convert to JSONString json_weather_data;int jsonIndex;for (int i = 0; i < weather_data.length(); i++) {if (weather_data[i] == '{') {jsonIndex = i;break;}}// Get JSON datajson_weather_data = weather_data.substring(jsonIndex);Serial.println();Serial.println("json_weather_data: ");Serial.println(json_weather_data);//利用arduinoJson库解析心知返回的json天气数据//可以利用 https://arduinojson.org/v5/assistant/ Arduinojson助手生成相关json解析代码  很方便！！！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(12) + 700;DynamicJsonBuffer jsonBuffer(capacity);const char* json = "{\"results\":[{\"location\":{\"id\":\"WTW3SJ5ZBJUY\",\"name\":\"上海\",\"country\":\"CN\",\"path\":\"上海,上海,中国\",\"timezone\":\"Asia/Shanghai\",\"timezone_offset\":\"+08:00\"},\"daily\":[{\"date\":\"2019-02-11\",\"text_day\":\"多云\",\"code_day\":\"4\",\"text_night\":\"阴\",\"code_night\":\"9\",\"high\":\"7\",\"low\":\"2\",\"precip\":\"\",\"wind_direction\":\"东北\",\"wind_direction_degree\":\"45\",\"wind_speed\":\"10\",\"wind_scale\":\"2\"},{\"date\":\"2019-02-12\",\"text_day\":\"中雨\",\"code_day\":\"14\",\"text_night\":\"小雨\",\"code_night\":\"13\",\"high\":\"9\",\"low\":\"4\",\"precip\":\"\",\"wind_direction\":\"东\",\"wind_direction_degree\":\"90\",\"wind_speed\":\"10\",\"wind_scale\":\"2\"},{\"date\":\"2019-02-13\",\"text_day\":\"小雨\",\"code_day\":\"13\",\"text_night\":\"中雨\",\"code_night\":\"14\",\"high\":\"10\",\"low\":\"7\",\"precip\":\"\",\"wind_direction\":\"东北\",\"wind_direction_degree\":\"45\",\"wind_speed\":\"10\",\"wind_scale\":\"2\"}],\"last_update\":\"2019-02-11T08:00:00+08:00\"}]}";JsonObject& root = jsonBuffer.parseObject(json_weather_data);JsonObject& results_0 = root["results"][0];JsonObject& results_0_location = results_0["location"];const char* results_0_location_id = results_0_location["id"]; // "WTW3SJ5ZBJUY"const char* results_0_location_name = results_0_location["name"]; // "上海"const char* results_0_location_country = results_0_location["country"]; // "CN"const char* results_0_location_path = results_0_location["path"]; // "上海,上海,中国"const char* results_0_location_timezone = results_0_location["timezone"]; // "Asia/Shanghai"const char* results_0_location_timezone_offset = results_0_location["timezone_offset"]; // "+08:00"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"]; // "2019-02-11"const char* results_0_daily_0_text_day = results_0_daily_0["text_day"]; // "多云"const char* results_0_daily_0_code_day = results_0_daily_0["code_day"]; // "4"const char* results_0_daily_0_text_night = results_0_daily_0["text_night"]; // "阴"const char* results_0_daily_0_code_night = results_0_daily_0["code_night"]; // "9"const char* results_0_daily_0_high = results_0_daily_0["high"]; // "7"const char* results_0_daily_0_low = results_0_daily_0["low"]; // "2"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"]; // "东北"const char* results_0_daily_0_wind_direction_degree = results_0_daily_0["wind_direction_degree"]; // "45"const char* results_0_daily_0_wind_speed = results_0_daily_0["wind_speed"]; // "10"const char* results_0_daily_0_wind_scale = results_0_daily_0["wind_scale"]; // "2"JsonObject& results_0_daily_1 = results_0_daily[1];const char* results_0_daily_1_date = results_0_daily_1["date"]; // "2019-02-12"const char* results_0_daily_1_text_day = results_0_daily_1["text_day"]; // "中雨"const char* results_0_daily_1_code_day = results_0_daily_1["code_day"]; // "14"const char* results_0_daily_1_text_night = results_0_daily_1["text_night"]; // "小雨"const char* results_0_daily_1_code_night = results_0_daily_1["code_night"]; // "13"const char* results_0_daily_1_high = results_0_daily_1["high"]; // "9"const char* results_0_daily_1_low = results_0_daily_1["low"]; // "4"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"]; // "东"const char* results_0_daily_1_wind_direction_degree = results_0_daily_1["wind_direction_degree"]; // "90"const char* results_0_daily_1_wind_speed = results_0_daily_1["wind_speed"]; // "10"const char* results_0_daily_1_wind_scale = results_0_daily_1["wind_scale"]; // "2"JsonObject& results_0_daily_2 = results_0_daily[2];const char* results_0_daily_2_date = results_0_daily_2["date"]; // "2019-02-13"const char* results_0_daily_2_text_day = results_0_daily_2["text_day"]; // "小雨"const char* results_0_daily_2_code_day = results_0_daily_2["code_day"]; // "13"const char* results_0_daily_2_text_night = results_0_daily_2["text_night"]; // "中雨"const char* results_0_daily_2_code_night = results_0_daily_2["code_night"]; // "14"const char* results_0_daily_2_high = results_0_daily_2["high"]; // "10"const char* results_0_daily_2_low = results_0_daily_2["low"]; // "7"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"]; // "东北"const char* results_0_daily_2_wind_direction_degree = results_0_daily_2["wind_direction_degree"]; // "45"const char* results_0_daily_2_wind_speed = results_0_daily_2["wind_speed"]; // "10"const char* results_0_daily_2_wind_scale = results_0_daily_2["wind_scale"]; // "2"const char* results_0_last_update = results_0["last_update"]; // "2019-02-11T08:00:00+08:00"   // Test if parsing succeeds.if (!root.success()) {Serial.println("parseObject() failed");return;}// .Serial.println();Serial.print("上海今天天气：　");Serial.println(results_0_daily_0_text_day);Serial.print("上海明天天气：　");Serial.println(results_0_daily_1_text_day);// Wait 5 secondsdelay(5000);
}

后续增加：

利用液晶屏显示天气信息

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