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单片机利用8266获取天气信息
1、esp8266从联网到云端取数据的原理 
2、使用esp8266模块获取天气的AT指令设置方法 （1）使用串口发送指令AT+CWMODE=1设置模块Wi-Fi应用模式为Station模式；
（2）发送指令AT+RST重启模块使应用模式更改生效；
（3）发送指令AT+CWJAP =”ssid”,”pwd”连接AP；
（4）发送指令AT+CIPMUX=0设置模块为单路连接模式，模块默认为单路连接模式；
（5）发送指令AT+CIPSTART=”TCP”,” api.seniverse.com”,80 与服务器建立TCP连接 ;
（6）发送指令AT+CIPMODE=1设置模块传输模式为透传模式；
（7）发送指令AT+CIPSEND开启透传模式向服务器发送数据，模块收到此指令后先换行后返回“>”
（8）剩下只需要发送 GET https://api.seniverse.com/v3/weather/now.json?key=XXXXXXXXXXX&location=beijing&language=zh-Hans&unit=c，就能获取到天气信息了。
说明： 天气网站：心知天气 tcp server: api.seniverse.com 端口：80 使用域名解析工具对“api.seniverse.com”进行解析， 得到该域名绑定的ip地址为：116.62.81.138
返回数据格式：心知天气返回的数据是json格式
解析方法：使用到第三方的开源库cJSON，ESP8266的SDK自带这些移植好的库。
esp8266模块作为tcp client主动连接心知天气服务器，方式如下： AT指令连接：AT+CIPSTART="TCP","api.seniverse.com",80
连接知心天气网站服务器： 
心知天气网站的天气api接口正常情况下应该返回的数据内容格式： {"results":[{"location":{"id":"WX4FBXXFKE4F","name":"北京","country":"CN","path":"北京,北京,中国","timezone":"Asia/Shanghai","timezone_offset":"+08:00"},"now":{"text":"阴","code":"9","temperature":"14"},"last_update":"2019-04-19T09:35:00+08:00"}]}
实测1： 请求方式：利用串口调试助手以http协议的GET方式向天气网站服务器提交请求
Api接口1（返回北京当天天气信息））：https://api.seniverse.com/v3/weather/now.json?key=XXXXXXXXXXX&location=beijing&language=zh-Hans&unit=c
请求内容：GET https://api.seniverse.com/v3/weather/now.json?key=XXXXXXXXXXX&location=beijing&language=zh-Hans&unit=c
返回内容：{"results":[{"location":{"id":"WX4FBXXFKE4F","name":"北京","country":"CN","path":"北京,北京,中国","timezone":"Asia/Shanghai","timezone_offset":"+08:00"},"now":{"text":"阴","code":"9","temperature":"14"},"last_update":"2019-04-19T09:35:00+08:00"}]}
我用了两种串口调试工具进行了测试，如下：
工具一：ESP8266调试工具2.0 
实测2： 请求方式：利用串口调试助手以http协议的GET方式向服务器提交请求
Api接口2（返回广州近3天天气信息）：https://api.seniverse.com/v3/weather/daily.json?key=XXXXXXXXXXX&location=guangzhou&language=en&unit=c&start=0&days=3
请求内容：GET https://api.seniverse.com/v3/weather/daily.json?key=XXXXXXXXXXX&location=guangzhou&language=en&unit=c&start=0&days=3
返回信息内容： {"results":[{"location":{"id":"WS0E9D8WN298","name":"Guangzhou","country":"CN","path":"Guangzhou,Guangzhou,Guangdong,China","timezone":"Asia/Shanghai","timezone_offset":"+08:00"},"daily":[{"date":"2019-04-19","text_day":"Storm","code_day":"16","text_night":"Thundershower","code_night":"11","high":"25","low":"21","precip":"","wind_direction":"CLM","wind_direction_degree":"","wind_speed":"10","wind_scale":"2"},{"date":"2019-04-20","text_day":"Moderate rain","code_day":"14","text_night":"Thundershower","code_night":"11","high":"27","low":"23","precip":"","wind_direction":"CLM","wind_direction_degree":"","wind_speed":"10","wind_scale":"2"},{"date":"2019-04-21","text_day":"Light rain","code_day":"13","text_night":"Thundershower","code_night":"11","high":"29","low":"24","precip":"","wind_direction":"CLM","wind_direction_degree":"","wind_speed":"10","wind_scale":"2"}],"last_update":"2019-04-19T08:00:00+08:00"}]}
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