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 <ESP8266WiFi.h> #include <ArduinoJson.h> #include <Wire.h> #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, 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0xff,0xff,0xff,0xff,0xff,0x7f,0x00,0x80,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x7f, 0xff,0xff,0xff,0xff,0xff,0xff,0x3f,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, 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<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"][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 } bin文件下载地址：http://bbs.doit.am/forum.php?mod=viewthread&tid=442&page=1&extra=#pid514 |
发表于 2018-6-15 12:41
