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。
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
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：
Arduino代码如下：
#include
#include
#include
#include "OLED.h"
static const char logo[] PROGMEM={
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0xff,0x7f,0x80,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0xff,0x03,0x00,0xf0,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0x7f,0x00,0x00,0x80,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0x0f,0x00,0x00,0x00,0xfe,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0x03,0x00,0x00,0x00,0xf8,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0xe0,0xff,0x03,0x00,0xe0,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0x1f,0x1c,0xf0,0x1f,0x00,0x80,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0x0f,0x00,0x80,0x7f,0x00,0x00,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0x0f,0x00,0x00,0xff,0x01,0x00,0xfc,0xff,0xff,0xff,0xff,0x7f,
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0xff,0xff,0xff,0xff,0x01,0x00,0x00,0xf8,0x0f,0x00,0xf0,0xff,0xff,0xff,0xff,0x7f,
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0xff,0xff,0x7f,0x00,0x7c,0x00,0x00,0xfc,0xff,0x00,0x00,0xfc,0xff,0xff,0xff,0x7f,
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0xff,0xff,0xff,0xff,0xff,0x0f,0x00,0x00,0xfc,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
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0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f
};
//GPIO4(SDA) GPIO5(SCL)
OLED display(4, 5);
const char* ssid = "xh003"; // XXXXXX -- 使用时请修改为当前你的 wifi ssid
const 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 KEY
const 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 speed
const unsigned long HTTP_TIMEOUT = 5000; // max respone time from server
const 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[16];//城市名称
char weather[32];//天气介绍（多云...）
char temp[16];//温度
char udate[32];//更新时间
};
WiFiClient client;
char response[MAX_CONTENT_SIZE];
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wifi
while (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oled
display.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 server
client.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 line
bool 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[length] = 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 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"][0]["location"]["name"]);
strcpy(userData->weather, root["results"][0]["now"]["text"]);
strcpy(userData->temp, root["results"][0]["now"]["temperature"]);
strcpy(userData->udate, root["results"][0]["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
}
转载地址：http://bbs.doit.am/forum.php?mod=viewthread&tid=442&extra=
