1-7 发送数据到互联网
ESP8266 家庭自动化项目中文版目录
现在，让我们将相同的数据发送到互联网。首先要做的是在 http://thingspeak.com 上创建一个帐户并设置一个频道。每个通道都有八个字段，可用于存储ESP8266传输的数据。
作为免费帐户，您不需要每分钟发送三次以上的数据。优点是您的数据存储在他们的服务器上，您可以在漂亮的图形上看到它们或将它们作为IFRAME嵌入到另一个Web服务器中。
在“通道设置”中，创建一个字段并将其命名为 Light，然后转到API密钥选项卡并获取 Write API KEY。在这里，如果您有一个想要读取其他模块写入的数据的应用程序，您还可以定义读取 APY KEY。这是在模块之间共享数据的基本方法。由于Witty模块具有LDR，因此我们可以使用它在 api.thingspeak.com 上每分钟记录一次数据：
#include
const char* WIFI_SSID="YOUR_WIFI_SSID";
const char* WIFI_PASSWORD="WIFI_PASSWORD";
const char* host="api.thingspeak.com";
const char* writeAPIKey="YOUR_WRITE_API_KEY";
#define LDR A0 在执行一次的 setup（）函数中，LDR引脚设置为 INPUT 引脚，并通过 WiFi.begin（WIFI_SSID，WIFI_PASSWORD）功能将ESP8266连接到Wi-Fi网络:
void setup(){
Serial.begin(115200);
delay(10);
pinMode(LDR,INPUT);
WiFi.begin(WIFI_SSID,WIFI_PASSWORD);
delay(20);
Serial.print("Connecting to ");
Serial.println(WIFI_SSID);
while(WiFi.status()!=WL_CONNECTED){
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected!");
Serial.println();
}在 loop（）函数中，每分钟都会从LDR传感器读取光强度并将其发布到 https://thingspeak.com/ 上的通道上的 Light 字段中：
void loop(){
if((millis()%(60*1000))==0){
//make TCP connections
WiFiClient client;
const int httpPort=80;
if(!client.connect(host,httpPort)){
return;
}
String url = "/update?key=";
url += writeAPIKey;
url += "&field1=";
url += String(analogRead(LDR));
url += "\r\n";
Serial.println(url);
//Request to the server
client.print(String("GET ")+url+" HTTP/1.1\r\n"+"Host: "+host+"\r\n"+"Connection: close\r\n\r\n");
}
}让我们看看几分钟后数据的样子：
现在，让我们结合从 wunderground.com 读取天气的草图和将数据发送到 thingspeak.com 的草图。它需要温度，湿度，露点和降水，它会将它们存储在 thinkspeak.com 上，以便以后我们可以导入它们。基本上，这将是一个天气记录器：
#include
#include
#include "WundergroundClient.h" 以下是 Wunderground 设置：
const String WUNDERGRROUND_API_KEY = "58dfbeb30d02af26";
const Boolean IS_METRIC = true;
WundergroundClient weather_data(IS_METRIC);
const char* WIFI_SSID = "YOUR_WIFI_SSID";
const char* WIFI_PASSWORD = "YOUR_WIFI_PASSWORD";
const String WUNDERGROUND_LANGUAGE = "EN";
const String WUNDERGROUND_COUNTRY = "NL";
const String WUNDERGROUND_CITY = "Eindhoven";
const char* host = "api.thingspeak.com";
const char* writeAPIKey = "YOUR_WRITE_API_KEY";
WiFiClient wifiClient以下是连接到Wi-Fi网络的 setup（）函数：
void setup() {
Serial.begin(115200);
delay(10);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
delay(20);
Serial.print("Connecting to ");
Serial.println(WIFI_SSID);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected!");
Serial.println();
}在 loop（）函数中，将从 wunderground.com 检索每分钟天气数据，并将其发布到 thingspeak.com 。除了温度，压力，降水和露点之外，还会在月相，日出或日落等串行输出中打印更多信息，如果您计划添加显示模块以显示所有天气状况，则可以使用这些信息：
void loop() {
if ((millis() % (60 * 1000)) == 0) {
Serial.println();
Serial.println("\n\nNext Loop-Step: " + String(millis()) + ":");
weather_data.updateConditions(WUNDERGRROUND_API_KEY, WUNDERGROUND_LANGUAGE,WUNDERGROUND_COUNTRY, WUNDERGROUND_CITY);
Serial.println("wundergroundHours: " + weather_data.getHours());
Serial.println("wundergroundMinutes: " + weather_data.getMinutes());
Serial.println("wundergroundSeconds: " + weather_data.getSeconds());
Serial.println("wundergroundDate: " + weather_data.getDate());
Serial.println("wundergroundMoonPctIlum: " + weather_data.getMoonPctIlum());
Serial.println("wundergroundMoonAge: " + weather_data.getMoonAge());
Serial.println("wundergroundMoonPhase: " + weather_data.getMoonPhase());
Serial.println("wundergroundSunriseTime: " + weather_data.getSunriseTime());
Serial.println("wundergroundSunsetTime: " + weather_data.getSunsetTime());
Serial.println("wundergroundMoonriseTime: " + weather_data.getMoonriseTime());
Serial.println("wundergroundMoonsetTime: " + weather_data.getMoonsetTime());
Serial.println("wundergroundWindSpeed: " + weather_data.getWindSpeed());
Serial.println("wundergroundWindDir: " + weather_data.getWindDir());
Serial.println("wundergroundCurrentTemp: " + weather_data.getCurrentTemp());
Serial.println("wundergroundTodayIcon: " + weather_data.getTodayIcon());
Serial.println("wundergroundTodayIconText: " + weather_data.getTodayIconText());
Serial.println("wundergroundMeteoconIcon: " + weather_data.getMeteoconIcon(weather_data.getTodayIconText()));
Serial.println("wundergroundWeatherText: " + weather_data.getWeatherText());
Serial.println("wundergroundHumidity: " + weather_data.getHumidity());
Serial.println("wundergroundPressure: " + weather_data.getPressure());
Serial.println("wundergroundDewPoint: " + weather_data.getDewPoint());
Serial.println("wundergroundPrecipitationToday: " + weather_data.getPrecipitationToday());
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
return;
}
String url = "/update?key=";
url+=writeAPIKey;
url+="&field1=";
url+=String(weather_data.getCurrentTemp());
url+="&field2=";
url+=String(weather_data.getPressure());
url+="&field3=";
url+=String(weather_data.getDewPoint());
url+="&field4=";
url+=String(weather_data.getPrecipitationToday());
url+="\r\n";
Serial.println(url);
// Request to the server
client.print(String("GET ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n\r\n");
Serial.println("---------------------------------------------------/\n");
}
}几分钟后，您可以看到 ESP8266 从 wunderground.com 收到的值，并发布在 thingspeak.com 的四个图表上显示：
