如何用ESP8266做一个天气预报
1、硬件用一个四博智联提供的nodemcu。一个OLED屏，一个USB线，4根杜邦线，可以上网的路由器，电脑。http://bbs.doit.am/data/attachment/forum/201806/12/212119wminzingec86jmz1.png
3V3---VCC GND---GND GPIO4(D2)---SDA GPIO5(D1)---SCL
2、设置路由器把路由器账号设置为把路由器账号设置为账号：xh003密码：zxd+19901120=3、烧录程序打开ESP_TOOLS下载工具，选择8266.工具下载：http://bbs.doit.am/forum.php?mod ... 6&highlight=TOO
http://bbs.doit.am/data/attachment/forum/201806/12/212138icdmd51lkx5y3mqo.png点击START.等待烧录完成。
烧录完成后复位一下nodemcu。等待10s左右。测试结果如下：http://bbs.doit.am/data/attachment/forum/201806/12/212201h3j9aplay3p2n24h.png http://bbs.doit.am/data/attachment/forum/201806/12/212201wir44e55w6g0o4eo.png
Arduino代码如下：#include <ESP8266WiFi.h>#include <ArduinoJson.h>#include <Wire.h>#include "OLED.h"static const char logo[] 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GPIO5(SCL)OLED display(4, 5);
const char* ssid = "xh003"; // XXXXXX -- 使用时请修改为当前你的 wifi ssidconst char* password = "zxd+19901120="; // XXXXXX -- 使用时请修改为当前你的 wifi 密码const char* host = "api.seniverse.com";const char* APIKEY = "wcmquevztdy1jpca"; //API KEYconst char* city = "shenzhen";const char* language = "en";//zh-Hans 简体中文会显示乱码
const unsigned long BAUD_RATE = 115200; // serial connection speedconst unsigned long HTTP_TIMEOUT = 5000; // max respone time from serverconst size_t MAX_CONTENT_SIZE = 1000; // max size of the HTTP response
// 我们要从此网页中提取的数据的类型struct UserData {char city;//城市名称char weather;//天气介绍（多云...）char temp;//温度char udate;//更新时间};
WiFiClient client;char response;char endOfHeaders[] = "\r\n\r\n";
/*** @Desc 初始化操作*/void setup() {WiFi.mode(WIFI_STA); //设置esp8266 工作模式Serial.begin(BAUD_RATE);delay(10);Serial.println();Serial.println();Serial.print("Connecting to ");//写几句提示，哈哈Serial.println(ssid);WiFi.begin(ssid, password); //连接wifiwhile (WiFi.status() != WL_CONNECTED) { //这个函数是wifi连接状态，返回wifi链接状态 delay(100); Serial.print(".");}Serial.println("");Serial.println("WiFi connected");delay(100);Serial.println("IP address: ");Serial.println(WiFi.localIP());//WiFi.localIP()返回8266获得的ip地址client.setTimeout(HTTP_TIMEOUT);
}
/*** @Desc主函数*/
void loop() { //初始化oleddisplay.begin();
//测试显示信息display.print("Hello DOIT",2,3);display.print("www.doit.am",4,3);delay(2*1000);display.clear();
while (!client.connected()){ if (!client.connect(host, 80)){ Serial.println("connection...."); delay(100); }}if (sendRequest(host, city, APIKEY) && skipResponseHeaders()) { clrEsp8266ResponseBuffer(); readReponseContent(response, sizeof(response)); UserData userData; if (parseUserData(response, &userData)) { printUserData(&userData); }}delay(300);//每5s调用一次}
/*** @发送请求指令*/bool sendRequest(const char* host, const char* cityid, const char* apiKey) {// We now create a URI for the request//心知天气String GetUrl = "/v3/weather/now.json?key=";GetUrl += apiKey;GetUrl += "&location=";GetUrl += city;GetUrl += "&language=";GetUrl += language;// This will send the request to the serverclient.print(String("GET ") + GetUrl + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n\r\n");Serial.println("create a request:");Serial.println(String("GET ") + GetUrl + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n");delay(100);return true;}
/*** @Desc 跳过 HTTP 头，使我们在响应正文的开头*/bool skipResponseHeaders() {// HTTP headers end with an empty linebool ok = client.find(endOfHeaders);if (!ok) { Serial.println("No response or invalid response!");}return ok;}
/*** @Desc 从HTTP服务器响应中读取正文*/void readReponseContent(char* content, size_t maxSize) {size_t length = client.peekBytes(content, maxSize);delay(100);Serial.println("Get the data from Internet!");content = 0;Serial.println(content);Serial.println("Read data Over!");client.flush();//这句代码需要加上不然会发现每隔一次client.find会失败}
/*** @Desc 解析数据* 数据格式如下：* {* "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": "多云",* "code": "4",* "temperature": "23"* },* "last_update": "2017-09-13T09:51:00+08:00"* }*}*/bool parseUserData(char* content, struct UserData* userData) {// -- 根据我们需要解析的数据来计算JSON缓冲区最佳大小// 如果你使用StaticJsonBuffer时才需要// const size_t BUFFER_SIZE = 1024;// 在堆栈上分配一个临时内存池// StaticJsonBuffer<BUFFER_SIZE> jsonBuffer;// -- 如果堆栈的内存池太大，使用 DynamicJsonBuffer jsonBuffer 代替DynamicJsonBuffer jsonBuffer;
JsonObject& root = jsonBuffer.parseObject(content);
if (!root.success()) { Serial.println("JSON parsing failed!"); return false;}
//复制我们感兴趣的字符串strcpy(userData->city, root["results"]["location"]["name"]);strcpy(userData->weather, root["results"]["now"]["text"]);strcpy(userData->temp, root["results"]["now"]["temperature"]);strcpy(userData->udate, root["results"]["last_update"]);//-- 这不是强制复制，你可以使用指针，因为他们是指向“内容”缓冲区内，所以你需要确保// 当你读取字符串时它仍在内存中return true;}
// 打印从JSON中提取的数据void printUserData( struct UserData* userData) {Serial.println("Print parsed data :");display.print("City: ",0,0);display.print(userData->city,0,6);display.print("Weat: ",2,0);display.print(userData->weather,2,6);display.print("Temp: ",4,0);display.print(userData->temp,4,6);// display.print("Last Updata : ",7,2);display.print(userData->udate,6,0);// display.print("\r\n");delay(4*1000);}
// 关闭与HTTP服务器连接void stopConnect() {Serial.println("Disconnect");client.stop();}
void clrEsp8266ResponseBuffer(void){ memset(response, 0, MAX_CONTENT_SIZE); //清空}
感谢分享
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