Onnowpurbo at 00:56, 7 June 2018

2018-06-07T00:56:39Z

Onnowpurbo: Created page with "==Source== #include "Wire.h" #include #include #include #include #define DS3231_I2C_ADDRESS 0x68 // Ethernet library configur..."

2018-06-07T00:51:43Z

Created page with "==Source== #include "Wire.h" #include <Time.h> #include <SPI.h> #include <Ethernet.h> #include <EthernetUdp.h> #define DS3231_I2C_ADDRESS 0x68 // Ethernet library configur..."

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==Source==

#include "Wire.h"
#include <Time.h>
#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>

#define DS3231_I2C_ADDRESS 0x68

// Ethernet library configuration
byte mac[] = { 0x24, 0x7B, 0xA2, 0x4A, 0x52, 0x10 };
IPAddress timeServer(128, 138, 140, 44 ); // time.nist.gov

unsigned int localPort = 8888;
const int NTP_PACKET_SIZE= 48;
byte packetBuffer[NTP_PACKET_SIZE];
EthernetUDP Udp;

void setup()
{
// Setup Communication
Wire.begin();
Serial.begin(9600);
Serial.print("OK Serial\n");
Ethernet.begin(mac);
Serial.print("OK LAN\n");
Udp.begin(localPort);

Serial.print("OK Comm\n");
setSyncInterval(10); // Set seconds between re-sync
setSyncProvider(getNtpTime);
getNtpTime;
Serial.print("OK NTP\n");

// set the initial time here:
// DS3231 seconds, minutes, hours, day, date, month, year
// setDS3231time(30,33,9, 2 ,28,11,16);
}

void loop()
{
setSyncProvider(getNtpTime);
// set the initial time here:
// DS3231 seconds, minutes, hours, day, date, month, year
setDS3231time(second(), minute(), hour()+7, 5 , 7, 6, 18);

displayTime(); // display the real-time clock data on the Serial Monitor,
getNtpTime;
// delay(1000);
}

/*----------------- DS3231 ----------------------*/

// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
return ( (val / 10 * 16) + (val % 10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
return ( (val / 16 * 10) + (val % 16) );
}

void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
// sets time and date data to DS3231
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0); // set next input to start at the seconds register
Wire.write(decToBcd(second)); // set seconds
Wire.write(decToBcd(minute)); // set minutes
Wire.write(decToBcd(hour)); // set hours
Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
Wire.write(decToBcd(month)); // set month
Wire.write(decToBcd(year)); // set year (0 to 99)
Wire.endTransmission();
}
void readDS3231time(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0); // set DS3231 register pointer to 00h
Wire.endTransmission();
Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
// request seven bytes of data from DS3231 starting from register 00h
*second = bcdToDec(Wire.read() & 0x7f);
*minute = bcdToDec(Wire.read());
*hour = bcdToDec(Wire.read() & 0x3f);
*dayOfWeek = bcdToDec(Wire.read());
*dayOfMonth = bcdToDec(Wire.read());
*month = bcdToDec(Wire.read());
*year = bcdToDec(Wire.read());
}
void displayTime()
{
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
// retrieve data from DS3231
readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month,
&year);
// send it to the serial monitor
Serial.print(hour, DEC);
// convert the byte variable to a decimal number when displayed
Serial.print(":");
if (minute < 10)
{
Serial.print("0");
}
Serial.print(minute, DEC);
Serial.print(":");
if (second < 10)
{
Serial.print("0");
}
Serial.print(second, DEC);
Serial.print(" ");
Serial.print(dayOfMonth, DEC);
Serial.print("/");
Serial.print(month, DEC);
Serial.print("/");
Serial.print(year, DEC);
Serial.print(" Day of week: ");
switch (dayOfWeek) {
case 1:
Serial.println("Sunday");
break;
case 2:
Serial.println("Monday");
break;
case 3:
Serial.println("Tuesday");
break;
case 4:
Serial.println("Wednesday");
break;
case 5:
Serial.println("Thursday");
break;
case 6:
Serial.println("Friday");
break;
case 7:
Serial.println("Saturday");
break;
}
}

/*-------- NTP code ----------*/

unsigned long getNtpTime()
{
sendNTPpacket(timeServer); // send an NTP packet to a time server
delay(500);

if ( Udp.parsePacket() ) {
Udp.read(packetBuffer,NTP_PACKET_SIZE);
unsigned long hi = word(packetBuffer[40], packetBuffer[41]);
unsigned long low = word(packetBuffer[42], packetBuffer[43]);
unsigned long secsSince1900 = hi << 16 | low;
const unsigned long seventyYears = 2208988800UL;
unsigned long epoch = secsSince1900 - seventyYears;
return epoch;
}
return 0; // return 0 if unable to get the time
}

unsigned long sendNTPpacket(IPAddress& address)
{
memset(packetBuffer, 0, NTP_PACKET_SIZE); // set all bytes in the buffer to 0

// Initialize values needed to form NTP request
packetBuffer[0] = B11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum
packetBuffer[2] = 6; // Max Interval between messages in seconds
packetBuffer[3] = 0xEC; // Clock Precision
// bytes 4 - 11 are for Root Delay and Dispersion and were set to 0 by memset
packetBuffer[12] = 49; // four-byte reference ID identifying
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;

// send the packet requesting a timestamp:
Udp.beginPacket(address, 123); //NTP requests are to port 123
Udp.write(packetBuffer,NTP_PACKET_SIZE);
Udp.endPacket();
}

Arduino: RTC DS3231 NTP Sync - Revision history

Onnowpurbo at 00:56, 7 June 2018

Onnowpurbo: Created page with "==Source== #include "Wire.h" #include #include #include #include #define DS3231_I2C_ADDRESS 0x68 // Ethernet library configur..."