Arduino利用Esp8266同步NTP服务器时间

在单片机开发过程中（基于树莓派的嵌入式可忽略），我们经常会遇到设置好的时间由于断电或其他原因不得不重新设置。

闲来无事波波就补充一篇Arduino利用Esp8266同步NTP服务器时间的笔记吧。

在本篇笔记中我们需要用到一个NTP类库，下载地址>>NTPclient-3.2.0.zip

代码片段：

#include <ESP8266WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>
const char *ssid = "WIFI信道";
const char *password = "WIFI密码";
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");
String weekDays[7]={"Sunday", "Monday", "Tuesday","Wednesday", "Thursday", "Friday", "Saturday"};
//Month names
String months[12]={"January", "February", "March", "April","May", "June", "July", "August", "September", "October", "November", "December"};
void setup() {
// Initialize Serial Monitor
Serial.begin(115200);
// Connect to Wi-Fi
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
// Initialize a NTPClient to get time
timeClient.begin();
//设置偏移时间（以秒为单位）以调整时区，例如：
// GMT +1 = 3600
// GMT +8 = 28800
// GMT -1 = -3600
// GMT 0 = 0
timeClient.setTimeOffset(28800);
}
void loop() {
timeClient.update();
//获取时间戳
unsigned long epochTime = timeClient.getEpochTime();
Serial.print("Epoch Time: ");
Serial.println(epochTime);
//转化为当前时间
String formattedTime = timeClient.getFormattedTime();
Serial.print("Formatted Time: ");
Serial.println(formattedTime);
int currentHour = timeClient.getHours();
Serial.print("Hour: ");
Serial.println(currentHour);
int currentMinute = timeClient.getMinutes();
Serial.print("Minutes: ");
Serial.println(currentMinute);
int currentSecond = timeClient.getSeconds();
Serial.print("Seconds: ");
Serial.println(currentSecond);
String weekDay = weekDays[timeClient.getDay()];
Serial.print("Week Day: ");
Serial.println(weekDay);
//Get a time structure
struct tm *ptm = gmtime ((time_t *)&epochTime);
int monthDay = ptm->tm_mday;
Serial.print("Month day: ");
Serial.println(monthDay);
int currentMonth = ptm->tm_mon+1;
Serial.print("Month: ");
Serial.println(currentMonth);
String currentMonthName = months[currentMonth-1];
Serial.print("Month name: ");
Serial.println(currentMonthName);
int currentYear = ptm->tm_year+1900;
Serial.print("Year: ");
Serial.println(currentYear);
//Print complete date:
String currentDate = String(currentYear) + "-" + String(currentMonth) + "-" + String(monthDay);
Serial.print("Current date: ");
Serial.println(currentDate);
Serial.println("");
delay(2000);
}