Arduino: LCD Clock NTP Sync - Revision history

Onnowpurbo at 23:59, 31 December 2017

2017-12-31T23:59:30Z

← Older revision		Revision as of 23:59, 31 December 2017
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	#include <EthernetUdp.h>		#include <EthernetUdp.h>
	#include <Time.h>		#include <Time.h>
			#include <LiquidCrystal.h>

	/* ****** Ethernet Card Settings ****** */		/* ****** Ethernet Card Settings ****** */
	// Set this to your Ethernet Card Mac Address		// Set this to your Ethernet Card Mac Address
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	/* ****** NTP Server Settings ****** */		/* ****** NTP Server Settings ****** */
	/* id.pool.ntp.org NTP server		/* us.pool.ntp.org NTP server
	(Set to your time server of choice) */		(Set to your time server of choice) */
	IPAddress timeServer(202, 65, 114, 202);		IPAddress timeServer(202, 65, 114, 202);
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	set to 1 hour or more to be reasonable */		set to 1 hour or more to be reasonable */
	unsigned int ntpSyncTime = 3600;		unsigned int ntpSyncTime = 3600;


	/* ALTER THESE VARIABLES AT YOUR OWN RISK */		/* ALTER THESE VARIABLES AT YOUR OWN RISK */
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	trys++;		trys++;
	}		}
	}		}

	// Do not alter this function, it is used by the system		// Do not alter this function, it is used by the system
	int getTimeAndDate() {		int getTimeAndDate() {
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	Udp.endPacket();		Udp.endPacket();
	}		}

			void displaytime()
			{
			LiquidCrystal lcd(12,11,5,4,3,2);
			lcd.setCursor(0,0);
			if (hour() < 10) lcd.print ("0");
			lcd.print (hour());
			lcd.print (":");
			if (minute() < 10) lcd.print ("0");
			lcd.print (minute());
			lcd.print (":");
			if (second() < 10) lcd.print ("0");
			lcd.print (second());
			lcd.print (" ");

			return;
			}

	// Clock display of the time and date (Basic)		// Clock display of the time and date (Basic)
	void clockDisplay(){		void clockDisplay(){
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	Serial.println();		Serial.println();
	}		}

	// Utility function for clock display: prints preceding colon and leading 0		// Utility function for clock display: prints preceding colon and leading 0
	void printDigits(int digits){		void printDigits(int digits){
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	}		}
	}		}

	// Display the time if it has changed by more than a second.		// Display the time if it has changed by more than a second.
	if( now() != prevDisplay){		if( now() != prevDisplay){
	prevDisplay = now();		prevDisplay = now();
	clockDisplay();		clockDisplay();
	}		displaytime();
			}
	}		}

Onnowpurbo at 11:55, 31 December 2017

2017-12-31T11:55:31Z

← Older revision		Revision as of 11:55, 31 December 2017
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	//sample code originated at http://www.openreefs.com/ntpServer		//sample code originated at http://www.openreefs.com/ntpServer
	//modified by Steve Spence, http://arduinotronics.blogspot.com		//modified by Steve Spence, http://arduinotronics.blogspot.com
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	/* ****** NTP Server Settings ****** */		/* ****** NTP Server Settings ****** */
	/* us.pool.ntp.org NTP server		/* id.pool.ntp.org NTP server
	(Set to your time server of choice) */		(Set to your time server of choice) */
	IPAddress timeServer(~~216~~, 23, ~~247~~, 62);		IPAddress timeServer(202, 65, 114, 202);

	/* Set this to the offset (in seconds) to your local time		/* Set this to the offset (in seconds) to your local time
	This example is GMT ~~- 4~~ */		This example is GMT +7 */
	const long timeZoneOffset = ~~-14400L~~;		const long timeZoneOffset = 25200L;

	/* Syncs to NTP server every 15 seconds for testing,		/* Syncs to NTP server every 15 seconds for testing,
	set to 1 hour or more to be reasonable */		set to 1 hour or more to be reasonable */
	unsigned int ntpSyncTime = 3600;		unsigned int ntpSyncTime = 3600;

	/* ALTER THESE VARIABLES AT YOUR OWN RISK */		/* ALTER THESE VARIABLES AT YOUR OWN RISK */
	// local port to listen for UDP packets		// local port to listen for UDP packets
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	// Check last time clock displayed (Not in Production)		// Check last time clock displayed (Not in Production)
	time_t prevDisplay = 0;		time_t prevDisplay = 0;

	void setup() {		void setup() {
	Serial.begin(9600);		Serial.begin(9600);
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	}		}
	}		}

	// Do not alter this function, it is used by the system		// Do not alter this function, it is used by the system
	int getTimeAndDate() {		int getTimeAndDate() {
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	Udp.endPacket();		Udp.endPacket();
	}		}

	// Clock display of the time and date (Basic)		// Clock display of the time and date (Basic)
	void clockDisplay(){		void clockDisplay(){
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	}		}
	}		}

	// Display the time if it has changed by more than a second.		// Display the time if it has changed by more than a second.
	if( now() != prevDisplay){		if( now() != prevDisplay){
	prevDisplay = now();		prevDisplay = now();
	clockDisplay();		clockDisplay();
	}		}
	}		}

Onnowpurbo: Created page with " //sample code originated at http://www.openreefs.com/ntpServer //modified by Steve Spence, http://arduinotronics.blogspot.com #include #include #in..."

2017-12-31T11:38:01Z

Created page with " //sample code originated at http://www.openreefs.com/ntpServer //modified by Steve Spence, http://arduinotronics.blogspot.com #include <SPI.h> #include <Ethernet.h> #in..."

New page

//sample code originated at http://www.openreefs.com/ntpServer
//modified by Steve Spence, http://arduinotronics.blogspot.com

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

/* ******** Ethernet Card Settings ******** */
// Set this to your Ethernet Card Mac Address
byte mac[] = { 0x90, 0xA2, 0xDA, 0x00, 0x23, 0x36 };

/* ******** NTP Server Settings ******** */
/* us.pool.ntp.org NTP server
(Set to your time server of choice) */
IPAddress timeServer(216, 23, 247, 62);

/* Set this to the offset (in seconds) to your local time
This example is GMT - 4 */
const long timeZoneOffset = -14400L;

/* Syncs to NTP server every 15 seconds for testing,
set to 1 hour or more to be reasonable */
unsigned int ntpSyncTime = 3600;

/* ALTER THESE VARIABLES AT YOUR OWN RISK */
// local port to listen for UDP packets
unsigned int localPort = 8888;
// NTP time stamp is in the first 48 bytes of the message
const int NTP_PACKET_SIZE= 48;
// Buffer to hold incoming and outgoing packets
byte packetBuffer[NTP_PACKET_SIZE];
// A UDP instance to let us send and receive packets over UDP
EthernetUDP Udp;
// Keeps track of how long ago we updated the NTP server
unsigned long ntpLastUpdate = 0;
// Check last time clock displayed (Not in Production)
time_t prevDisplay = 0;

void setup() {
Serial.begin(9600);

// Ethernet shield and NTP setup
int i = 0;
int DHCP = 0;
DHCP = Ethernet.begin(mac);
//Try to get dhcp settings 30 times before giving up
while( DHCP == 0 && i < 30){
delay(1000);
DHCP = Ethernet.begin(mac);
i++;
}
if(!DHCP){
Serial.println("DHCP FAILED");
for(;;); //Infinite loop because DHCP Failed
}
Serial.println("DHCP Success");

//Try to get the date and time
int trys=0;
while(!getTimeAndDate() && trys<10) {
trys++;
}
}

// Do not alter this function, it is used by the system
int getTimeAndDate() {
int flag=0;
Udp.begin(localPort);
sendNTPpacket(timeServer);
delay(1000);
if (Udp.parsePacket()){
Udp.read(packetBuffer,NTP_PACKET_SIZE); // read the packet into the buffer
unsigned long highWord, lowWord, epoch;
highWord = word(packetBuffer[40], packetBuffer[41]);
lowWord = word(packetBuffer[42], packetBuffer[43]);
epoch = highWord << 16 | lowWord;
epoch = epoch - 2208988800 + timeZoneOffset;
flag=1;
setTime(epoch);
ntpLastUpdate = now();
}
return flag;
}

// Do not alter this function, it is used by the system
unsigned long sendNTPpacket(IPAddress& address)
{
memset(packetBuffer, 0, NTP_PACKET_SIZE);
packetBuffer[0] = 0b11100011;
packetBuffer[1] = 0;
packetBuffer[2] = 6;
packetBuffer[3] = 0xEC;
packetBuffer[12] = 49;
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;
Udp.beginPacket(address, 123);
Udp.write(packetBuffer,NTP_PACKET_SIZE);
Udp.endPacket();
}

// Clock display of the time and date (Basic)
void clockDisplay(){
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
Serial.println();
}

// Utility function for clock display: prints preceding colon and leading 0
void printDigits(int digits){
Serial.print(":");
if(digits < 10)
Serial.print('0');
Serial.print(digits);
}

// This is where all the magic happens...
void loop() {
// Update the time via NTP server as often as the time you set at the top
if(now()-ntpLastUpdate > ntpSyncTime) {
int trys=0;
while(!getTimeAndDate() && trys<10){
trys++;
}
if(trys<10){
Serial.println("ntp server update success");
}
else{
Serial.println("ntp server update failed");
}
}

// Display the time if it has changed by more than a second.
if( now() != prevDisplay){
prevDisplay = now();
clockDisplay();
}
}