Arduino网络编程实战-Ethernet篇-NTP客户端

NTP客户端

Arduino Ethernet Shield V1 允许 Arduino 板连接到互联网。 它基于 Wiznet W5100ethernet 芯片（数据表）。 Wiznet W5100 提供支持 TCP 和 UDP 的网络 (IP) 堆栈。 它最多支持四个同时套接字连接。

本次实例将演示如何NPT请求。

在这里插入图片描述

1、硬件准备

  • Arduino Mega 2560
  • Arduino Ethernet Shield
  • 路由器（推荐可以上网、开启DHCP）
  • 网线一条
  • 电脑一台

2、软件准备

3、代码实现

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#include <SPI.h>
#include <Ethernet.h>
#include <NTPClient\_Generic.h> 

#define USE\_STATIC 0
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
#if USE\_STATIC
IPAddress ip(192, 168, 0, 177);
#endif


EthernetUDP ntpUDP;
// 设置时区
#define TIME\_ZONE\_OFFSET\_HRS (8)
// NTP客户端
NTPClient timeClient(ntpUDP);

void setup() {
  
   Serial.begin(9600);
   Serial.println("Ethernet Web Server Example");
   
#if USE\_STATIC
   Ethernet.begin(mac,ip);
#else
  Ethernet.begin(mac);
#endif

   if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
    while (true) {
      delay(1); 
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
    while(true){
      delay(1);  
    }
  }

  Serial.print("IP:");
  Serial.println(Ethernet.localIP());
  Serial.print("Subnet Mask:");
  Serial.println(Ethernet.subnetMask());
  Serial.print("Gateway:");
  Serial.println(Ethernet.gatewayIP());
  Serial.print("DNS Server:");
  Serial.println(Ethernet.dnsServerIP());


  // 初始化NTP客户端
  timeClient.begin();
  timeClient.setTimeOffset(3600 \* TIME_ZONE_OFFSET_HRS);
  // default 60000 => 60s. Set to once per hour
  timeClient.setUpdateInterval(SECS_IN_HR);
  
  Serial.println("Using NTP Server " + timeClient.getPoolServerName());
  
}

void loop() {
  // 发起请求
  timeClient.update();
  if (timeClient.updated())
    Serial.println("\*\*\*\*\*\*\*\*UPDATED\*\*\*\*\*\*\*\*");
  else
    Serial.println("\*\*\*\*\*\*NOT UPDATED\*\*\*\*\*\*");

  Serial.println("UTC : " + timeClient.getFormattedUTCTime());
  Serial.println("UTC : " + timeClient.getFormattedUTCDateTime());
  Serial.println("LOC : " + timeClient.getFormattedTime());
  Serial.println("LOC : " + timeClient.getFormattedDateTime());
  Serial.println("UTC EPOCH : " + String(timeClient.getUTCEpochTime()));
  Serial.println("LOC EPOCH : " + String(timeClient.getEpochTime()));

  // Function test
  // 获取世界标准时间（UTC）前缀加不0 
  Serial.println(String("UTC : ") + timeClient.getUTCHours() + ":" + timeClient.getUTCMinutes() + ":" + timeClient.getUTCSeconds() + " " +
        timeClient.getUTCDoW() + " " + timeClient.getUTCDay() + "/" + timeClient.getUTCMonth() + "/" + timeClient.getUTCYear() + " or " +
        timeClient.getUTCDay() + " " + timeClient.getUTCMonthStr() + " " + timeClient.getUTCYear());
  // 获取世界标准时间（UTC）前缀加0 
  Serial.println(String("UTC : ") + timeClient.getUTCStrHours() + ":" + timeClient.getUTCStrMinutes() + ":" + timeClient.getUTCStrSeconds() + " " +
        timeClient.getUTCDoW() + " " + timeClient.getUTCDay() + "/" + timeClient.getUTCMonth() + "/" + timeClient.getUTCYear() + " or " +
        timeClient.getUTCDay() + " " + timeClient.getUTCMonthStr() + " " + timeClient.getUTCYear());      
  // 前缀加不0 
  Serial.println(String("LOC : ") + timeClient.getHours() + ":" + timeClient.getMinutes() + ":" + timeClient.getSeconds() + " " +
        timeClient.getDoW() + " " + timeClient.getDay() + "/" + timeClient.getMonth() + "/" + timeClient.getYear() + " or " +
        timeClient.getDay() + " " + timeClient.getMonthStr() + " " + timeClient.getYear());
  // 前缀加0
  Serial.println(String("LOC : ") + timeClient.getStrHours() + ":" + timeClient.getStrMinutes() + ":" + timeClient.getStrSeconds() + " " +
        timeClient.getDoW() + " " + timeClient.getDay() + "/" + timeClient.getMonth() + "/" + timeClient.getYear() + " or " +
        timeClient.getDay() + " " + timeClient.getMonthStr() + " " + timeClient.getYear());       

  delay(1000);
}

4、运行结果

在这里插入图片描述

文章来源: https://iotsmart.blog.csdn.net/article/details/122741096