ESP8266 wifi 网络时钟(精准免校时时钟) NTP网络时间协议 OneNet NTP服务

AllBlue · 发表于 2016-9-12 14:29:50

本帖最后由 AllBlue 于 2017-10-6 09:02 编辑

ESP8266 ntp网络时钟永不校时时钟首先我们认识下NTP是什么？
NTP，Network Time Protocol，网络时间协议；它是用来使网络中的各个计算机时间同步的一种协议。它的用途是把计算机的时钟同步到世界协调时UTC，其精度在局域网内可达0.1ms，在互联网上绝大多数的地方其精度可以达到1-50ms。原理（看了上面的NTP介绍，原理就很简单了）：
ESP8266连接到network，并获取NTP（Network Time Protocol，网络时间协议）。

提供NTP服务的有很多，windows系统就有自动更新时间，其实就是windows公司提供的NTP服务，根据下图找到window NTP服务器：

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windowsNTP.jpg (103.21 KB, 下载次数: 153)

下载附件

2016-9-10 11:12 上传

从图中可以看到有5个服务器支持：time.windows.com 、time.nist.gov 、time-nw.nist.gov 、time-a.nist.gov 、time-b.nist.gov。
你可以点击“立即更新”按钮试试看是否可以正常工作。
下面是测试例程，使用的是ESP8266 模块，arduino IDE开发）：

[C] 纯文本查看 复制代码

/*
   NTP Clock Program -- 网络时钟
   Network Time Protocol (NTP)
   ESP8266 连接到NET WORK ，获取NTP

   [url=https://github.com/PaulStoffregen/Time]https://github.com/PaulStoffregen/Time[/url]

   [url=https://github.com/JChristensen/Timezone]https://github.com/JChristensen/Timezone[/url]

   by: yfrobot
   [url=http://www.yfrobot.com]http://www.yfrobot.com[/url]
*/

#include <ESP8266WiFi.h>
#include <Time.h>
#include <Timezone.h>
#include "NTP.h"


// Set your WiFi login credentials
#define WIFI_SSID "YFROBOT"       // 使用时请修改为当前你的 wifi ssid
#define WIFI_PASS "yfrobot2016"   // 使用时请修改为当前你的 wifi 密码

#define ledPin 14                          // 定义ledPin连接到GPIO14

// This clock is in the Mountain Time Zone
// Change this for your timezone
// 北京时间时区
#define STD_TIMEZONE_OFFSET +8    // Standard Time offset (-7 is mountain time)

// ***************************************************************
// TimeZone and Daylight Savings Time Rules
// ***************************************************************

// Define daylight savings time rules for the China
TimeChangeRule mySTD = {"", First,  Sun, Jan, 0, STD_TIMEZONE_OFFSET * 60};
Timezone myTZ(mySTD, mySTD);

WiFiClient client;

// This function is called once a second
void updateDisplay(void) {

  TimeChangeRule *tcr;        // Pointer to the time change rule

  // Read the current UTC time from the NTP provider
  time_t utc = now();

  // Convert to local time taking DST into consideration
  time_t localTime = myTZ.toLocal(utc, &tcr);

  // Map time to pixel positions
  int weekdays=   weekday(localTime);
  int days    =   day(localTime);
  int months  =   month(localTime);
  int years   =   year(localTime);
  int seconds =   second(localTime);
  int minutes =   minute(localTime);
  int hours   =   hour(localTime) ;   //12 hour format use : hourFormat12(localTime)  isPM()/isAM()
  Serial.println("");
  Serial.print("Current local time:");
  Serial.print(days);
  Serial.print("/");
  Serial.print(months);
  Serial.print("/");
  Serial.print(years);
  Serial.print(" - ");
  Serial.print(hours);
  Serial.print(":");
  Serial.print(minutes);
  Serial.print(":");
  Serial.print(seconds);
  Serial.print(" - ");
  Serial.print(dayStr(weekdays));
  Serial.println("");
}

void setup() {

  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  delay(10);

  // We start by connecting to a WiFi network
  initNTP(WIFI_SSID, WIFI_PASS);
}

// Previous seconds value
time_t previousSecond = 0;

void loop() {
  //  Update the display only if time has changed
  if (timeStatus() != timeNotSet) {
    if (second() != previousSecond) {
      previousSecond = second();
      // Update the display
      updateDisplay();
    }
  }
  delay(1000);
}

NTP.h 文件：

[C] 纯文本查看 复制代码

/*
   ESP8266 NeoPixel NTP Clock Program

    NTP.h - Network Time Protocol Functions

    Portions of this code were extracted from the
    Time library examples by Michael Margolis and
    Paul Stoffregen. Other portions from the NTPClient
    example program from the Arduino ESP8266 package.

    Concept, Design and Implementation by: Craig A. Lindley
    Last Update: 04/12/2016
*/

#ifndef NTP_H
#define NTP_H

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <TimeLib.h>
#include <WiFiUdp.h>

#define LOCALPORT     5000 // Local port to listen for UDP packets
#define NTP_PACKET_SIZE 48 // NTP time stamp is in the first 48 bytes of the message

// A UDP instance to let us send and receive packets over UDP
WiFiUDP udp;

byte packetBuffer[NTP_PACKET_SIZE]; // Buffer to hold incoming and outgoing packets

// Don't hardwire the IP address or we won't get the benefits of the time server pool.
const char *ntpServerName ;//= "time.windows.com";//"1.cn.pool.ntp.org";
IPAddress timeServerIP(183,230,40,42);  //ONENET -- NTP


// Send an NTP request to the time server at the given address
unsigned long sendNTPpacket(IPAddress& address) {

  // Set all bytes in the buffer to 0
  memset(packetBuffer, 0, NTP_PACKET_SIZE);

  // Initialize values needed to form NTP request
  packetBuffer[0] = 0b11100011;   // LI, Version, Mode
  packetBuffer[1] = 0;     // Stratum, or type of clock
  packetBuffer[2] = 6;     // Polling Interval
  packetBuffer[3] = 0xEC;  // Peer Clock Precision
  // 8 bytes of zero for Root Delay & Root Dispersion
  packetBuffer[12]  = 49;
  packetBuffer[13]  = 0x4E;
  packetBuffer[14]  = 49;
  packetBuffer[15]  = 52;

  // All NTP fields have been given values, now
  // you can send a packet requesting a timestamp:
  udp.beginPacket(address, 123); // NTP requests are to port 123
  udp.write(packetBuffer, NTP_PACKET_SIZE);
  udp.endPacket();
}

// NTP Time Provider Code
time_t getNTPTime() {

  int attempts = 10;

  // Try multiple attempts to return the NTP time
  while (attempts--) {

    // Get a server from the pool
    if(ntpServerName != NULL){
        WiFi.hostByName(ntpServerName, timeServerIP);
    }
    Serial.printf("Time server IP address: ");
    Serial.println(timeServerIP);

    while (udp.parsePacket() > 0); // Discard any previously received packets

    Serial.println("Transmitted NTP Request");
    sendNTPpacket(timeServerIP);

    uint32_t beginWait = millis();
    while (millis() - beginWait < 1500) {
      int size = udp.parsePacket();
      if (size >= NTP_PACKET_SIZE) {
        Serial.println("Received NTP Response");
        udp.read(packetBuffer, NTP_PACKET_SIZE);  // Read packet into the buffer
        unsigned long secsSince1900;

        // Convert four bytes starting at location 40 to a long integer
        secsSince1900 =  (unsigned long) packetBuffer[40] << 24;
        secsSince1900 |= (unsigned long) packetBuffer[41] << 16;
        secsSince1900 |= (unsigned long) packetBuffer[42] << 8;
        secsSince1900 |= (unsigned long) packetBuffer[43];

        Serial.println("Got the time");

        return secsSince1900 - 2208988800UL;
      }
      delay(10);
    }
    Serial.println("Retrying NTP request");
    delay(4000);
  }
  Serial.println("No NTP Response");
  return 0;
}

// Login to WiFi network and assign the time sync provider
void initNTP(const char *ssid, const char *password) {

  // Set station mode
  WiFi.mode(WIFI_STA);   //set work mode:  WIFI_AP /WIFI_STA /WIFI_AP_STA

  // Start by connecting to a WiFi network
  WiFi.begin(ssid, password);

  int i = 0;
  while ((WiFi.status() != WL_CONNECTED) && (i++ < 30)) {
    delay(500);
    Serial.printf(".");
  }
  if (i == 31) {
    Serial.printf("\nCould not connect to: %s\n", ssid);
    return;
  }
  Serial.printf("\nConnected to: %s\n", ssid);
  delay(500);

  // Login suceeded so set UDP local port
  udp.begin(LOCALPORT);

  // Set the time provider to NTP
  setSyncProvider(getNTPTime);
}

#endif

程序下载：

游客，如果您要查看本帖隐藏内容请回复

github 项目地址：https://github.com/YFROBOT-TM/YFRobot-NTPClock_OneNet

该例程中使用的是ONENET的NTP服务，服务器IP和端口号：183.230.40.42:80。测试可用！
想要使用上面提到的window NTP，定义NTP.h文件中的ntpServerName，像下面这样：

[C] 纯文本查看 复制代码

const char *ntpServerName = "time.windows.com";  //"1.cn.pool.ntp.org"

串口打印：

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ccdos · 发表于 2020-3-21 20:12:18

ESP8266 wifi 网络时钟(精准免校时时钟) NTP网络时间协议 OneNet NTP服务

MR1FC · 发表于 2020-3-1 08:16:36

谢谢楼主想半天也想不出来怎么做

用户名被谁抢注 · 发表于 2019-10-23 10:42:29

ESP8266 wifi 网络时钟(精准免校时时钟) NTP网络时间协议

xfsss · 发表于 2019-10-2 14:48:54

感谢分享，学习

sbtr5651 · 发表于 2019-9-22 07:28:14

谢谢分享！

jamespo · 发表于 2019-9-19 11:40:49

感謝分享，學習

jamespo · 发表于 2019-9-17 14:51:06

謝樓主分享。。。。。。。

tiantianyouyou · 发表于 2019-5-20 08:40:23

不错，很值得学习

tiantianyouyou · 发表于 2019-5-7 16:27:56

不错，很值得学习一下

tiantianyouyou · 发表于 2019-5-6 17:28:54

非常感谢！非常实用！！

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