/*
Udp NTP Client
Get the time from a Network Time Protocol (NTP) time server
Demonstrates use of UDP sendPacket and ReceivePacket
For more on NTP time servers and the messages needed to communicate with them,
see http://en.wikipedia.org/wiki/Network_Time_Protocol
created 4 Sep 2010
by Michael Margolis
modified 9 Apr 2012
by Tom Igoe
updated for the ESP8266 12 Apr 2015
by Ivan Grokhotkov
This code is in the public domain.
*/
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
char ssid[] = "74170287"; // your network SSID (name)
char pass[] = "24063173"; // your network password
unsigned int localPort = 2390; // local port to listen for UDP packets
/* Don't hardwire the IP address or we won't get the benefits of the pool.
Lookup the IP address for the host name instead */
//IPAddress timeServer(129, 6, 15, 28); // time.nist.gov NTP server
IPAddress timeServerIP; // time.nist.gov NTP server address
const char* ntpServerName = "clock.stdtime.gov.tw";
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;
const int strobe = 4; //D2
const int clock = 5; //D1
const int data = 16; //D0
void setup() {
Serial.begin(115200);
Serial.println();
Serial.println();
// We start by connecting to a WiFi network
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("Starting UDP");
udp.begin(localPort);
Serial.print("Local port: ");
Serial.println(udp.localPort());
pinMode(strobe, OUTPUT);
pinMode(clock, OUTPUT);
pinMode(data, OUTPUT);
sendCommand(0x8f); // activate
reset();
}
int timenumber;
// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0; // will store last time LED was updated
// constants won't change:
const long interval = 10000; // interval at which to blink (milliseconds)
void loop() {
//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);
unsigned long currentMillis = millis();
int cb = udp.parsePacket();
if (!cb) {
Serial.println("no packet yet");
}
else
{
if (currentMillis - previousMillis >= interval) {
// save the last time you blinked the LED
previousMillis = currentMillis;
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);
// 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(':');
timenumber= (((epoch % 86400L) / 3600)+8) % 24 ;
Dis2digit(timenumber,0xc0);
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)
timenumber= (epoch % 3600) / 60;
Dis2digit(timenumber,0xc6);
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
timenumber= (epoch % 60);
Dis2digit_1(timenumber,0xcc);
} // (currentMillis - previousMillis >= interval)
} // wait ten seconds before asking for the time again
}
// 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();
}
void sendCommand(uint8_t value)
{
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, value);
digitalWrite(strobe, HIGH);
}
void reset()
{
sendCommand(0x40); // set auto increment mode
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, 0xc0); // set starting address to 0
for(uint8_t i = 0; i < 16; i++)
{
shiftOut(data, clock, LSBFIRST, 0x00);
}
digitalWrite(strobe, HIGH);
}
void Dis2digit(int num1,int addr1)
{
/*0*/ /*1*/ /*2*/ /*3*/ /*4*/ /*5*/ /*6*/ /*7*/ /*8*/ /*9*/
uint8_t digits[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f ,0x00};
int number1=num1;
int n1=number1/10;
int n0=number1%10;
//0xc0 第8個 七段 0xc2 第7個 七段 0xc4 第6個 七段 0xc6 第5個 七段 0xc8 第4個 七段
//0xc1 第8個 LED 0xc3 第7個 LED 0xc5 第6個 LED 0xc7 第5個 LED 0xc9 第4個 LED
sendCommand(0x44); // set single address
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, addr1); // 4st digit 7-segment display
shiftOut(data, clock, LSBFIRST, digits[n1]);
digitalWrite(strobe, HIGH);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, addr1+2); // 3st digit 7-segment display
shiftOut(data, clock, LSBFIRST, digits[n0]);
digitalWrite(strobe, HIGH);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, addr1+4); // 3st digit 7-segment display
shiftOut(data, clock, LSBFIRST, 0x40);
digitalWrite(strobe, HIGH);
}
void Dis2digit_1(int num1,int addr1)
{
/*0*/ /*1*/ /*2*/ /*3*/ /*4*/ /*5*/ /*6*/ /*7*/ /*8*/ /*9*/
uint8_t digits[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f ,0x00};
int number1=num1;
int n1=number1/10;
int n0=number1%10;
//0xc0 第8個 七段 0xc2 第7個 七段 0xc4 第6個 七段 0xc6 第5個 七段 0xc8 第4個 七段
//0xc1 第8個 LED 0xc3 第7個 LED 0xc5 第6個 LED 0xc7 第5個 LED 0xc9 第4個 LED
sendCommand(0x44); // set single address
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, addr1); // 4st digit 7-segment display
shiftOut(data, clock, LSBFIRST, digits[n1]);
digitalWrite(strobe, HIGH);
digitalWrite(strobe, LOW);
shiftOut(data, clock, LSBFIRST, addr1+2); // 3st digit 7-segment display
shiftOut(data, clock, LSBFIRST, digits[n0]);
digitalWrite(strobe, HIGH);
}
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