esp8266时钟代码

以下是一个 ESP8266 的时钟代码示例，可以在 Arduino IDE 中使用。在此示例中，将 ESP8266 连接到互联网，并使用简单的 HTTP 请求从一个在线时钟 API 获取时间。

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266HTTPClient.h>

const char* ssid = "your_SSID";      // WIFI SSID
const char* password = "your_PASSWORD";// WIFI PASSWORD

const char* host = "worldtimeapi.org";    // API host
const char* endpoint = "/api/ip";        // API endpoint
const int httpPort = 80;

void setup() {
  Serial.begin(9600);
  delay(10);

  // Connect to WIFI
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  // Make a HTTP request
  WiFiClient client;
  HTTPClient http;
  
  if (http.begin(client, host, httpPort, endpoint)) {
    Serial.println("HTTP request started");
    int httpCode = http.GET();
    if (httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
      Serial.println("HTTP request done");
      Serial.println(payload);
      
      // Extract current time from the API response
      int index = payload.indexOf("currentDateTime") + 18; 
      String datetime = payload.substring(index, index+19);
      Serial.println("Current time: " + datetime); 
      
      // Display time on Serial Monitor
      Serial.print("Hours: ");
      Serial.println(datetime.substring(11, 13));
      Serial.print("Minutes: ");
      Serial.println(datetime.substring(14, 16));
      Serial.print("Seconds: ");
      Serial.println(datetime.substring(17, 19));
    } else {
      Serial.println("HTTP request failed");
    }
    http.end();
  } else {
    Serial.println("Unable to connect");
  }
  
  delay(1000);
}

请确保将代码中的 WIFI SSID 和密码更改为您自己的网络凭据。 运行此代码后，在串行监视器窗口中就会显示当前时间。例如，如果当前时间是下午 2:30，它将显示以下输出：

Current time: 2021-10-16T14:30:45
Hours: 14
Minutes: 30
Seconds: 45