- #include <ESP8266WiFiMulti.h>
- #include <WiFiUdp.h>
- #include"rtctime.h"
- #include <time.h> // time() ctime()
- ESP8266WiFiMulti WiFiMulti;
- unsigned int localPort = 2390; // local port to listen for UDP packets
- IPAddress timeServerIP; // time.nist.gov NTP server address
- const char* ntpServerName = "time.nist.gov";
- const int NTP_PACKET_SIZE = 48; // NTP time stamp is in the first 48 bytes of the message
- byte packetBuffer[NTP_PACKET_SIZE]; // buffer to hold incoming and outgoing packets
- // A UDP instance to let us send and receive packets over UDP
- WiFiUDP udp;
- struct rtc_tm rtcdate;
- // NTP 服务器地址
- const char* ntpServer = "pool.ntp.org";
- // 时区和夏令时设置（例如：GMT+8）
- const long gmtOffset_sec = 8 * 3600;
- const int daylightOffset_sec = 0;
- void setup() {
- // put your setup code here, to run once:
- Serial.begin(115200);
- delay(100);
- WiFi.mode(WIFI_STA);
- WiFiMulti.addAP("XGY-NJY", "njy123456");
- Serial.println('\n');
- while(WiFiMulti.run() != WL_CONNECTED)
- {
- Serial.print("-.-");
- delay(250);
- }
- Serial.println('\n');
-
- Serial.print("Connected to :");
- Serial.println(WiFi.SSID());
- Serial.print("IP=");
- Serial.println(WiFi.localIP());
- Serial.println("Starting UDP");
- udp.begin(localPort);
- Serial.print("Local port: ");
- Serial.println(udp.localPort());
- // 配置时间
- configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
- // 等待并获取时间
- struct tm timeinfo;
- if (!getLocalTime(&timeinfo)) {
- Serial.println("Failed to obtain time");
- return;
- }
- char timeStringBuff[50]; // 缓冲区大小根据需要调整
- sprintf(timeStringBuff, "Current time: %04d-%02d-%02d %02d:%02d:%02d",
- timeinfo.tm_year + 1900,
- timeinfo.tm_mon + 1,
- timeinfo.tm_mday,
- timeinfo.tm_hour,
- timeinfo.tm_min,
- timeinfo.tm_sec);
- // 输出当前时间
- Serial.println(timeStringBuff);
-
- }
- void loop() {
- // put your main code here, to run repeatedly:
- // get a random server from the pool
- WiFi.hostByName(ntpServerName, timeServerIP);
- sendNTPpacket(timeServerIP); // send an NTP packet to a time server
- // wait to see if a reply is available
- delay(1000);
- int cb = udp.parsePacket();
- if (!cb)
- {
- Serial.println("no packet yet");
- } else
- {
- Serial.print("packet received, length=");
- Serial.println(cb);
- // We've received a packet, read the data from it
- udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
- // the timestamp starts at byte 40 of the received packet and is four bytes,
- // or two words, long. First, esxtract the two words:
- unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
- unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]);
- // combine the four bytes (two words) into a long integer
- // this is NTP time (seconds since Jan 1 1900):
- unsigned long secsSince1900 = highWord << 16 | lowWord;
- Serial.print("Seconds since Jan 1 1900 = ");
- Serial.println(secsSince1900);
- // now convert NTP time into everyday time:
- Serial.print("Unix time = ");
- // Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
- const unsigned long seventyYears = 2208988800UL;
- // subtract seventy years:
- unsigned long epoch = secsSince1900 - seventyYears;
- // print Unix time:
- Serial.println(epoch);
- rtctime_gmtime(epoch,&rtcdate);
- Serial.println("The Beijing time is :");
- //下面变量要多定义一个，这样最后一个空闲作为结束标志
- char date_temp[11];
- char time_temp[9];
- sprintf(date_temp,"%04d-%02d-%02d",1900+rtcdate.tm_year,1+rtcdate.tm_mon,rtcdate.tm_mday);
- sprintf(time_temp,"%02d-%02d-%02d",8+rtcdate.tm_hour,rtcdate.tm_min,rtcdate.tm_sec);
- Serial.println(date_temp);
- Serial.println(time_temp);
- /*
- // print the hour, minute and second:
- Serial.print("The UTC time is "); // UTC is the time at Greenwich Meridian (GMT)
- Serial.print((epoch % 86400L) / 3600); // print the hour (86400 equals secs per day)
- Serial.print(':');
- if (((epoch % 3600) / 60) < 10)
- {
- // In the first 10 minutes of each hour, we'll want a leading '0'
- Serial.print('0');
- }
- Serial.print((epoch % 3600) / 60); // print the minute (3600 equals secs per minute)
- Serial.print(':');
- if ((epoch % 60) < 10)
- {
- // In the first 10 seconds of each minute, we'll want a leading '0'
- Serial.print('0');
- }
- Serial.println(epoch % 60); // print the second
- */
- }
- // wait ten seconds before asking for the time again
- delay(10000);
- }
- // send an NTP request to the time server at the given address
- void sendNTPpacket(IPAddress& address) {
- Serial.println("sending NTP packet...");
- // set all bytes in the buffer to 0
- memset(packetBuffer, 0, NTP_PACKET_SIZE);
- // Initialize values needed to form NTP request
- // (see URL above for details on the packets)
- 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();
- }
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