I'm trying to turn a LED on at 7.30 updating the time from an NTP server, the time is updated but the timer does not work! Can anyone help me?
/*
* Time_NTP.pde
* Example showing time sync to NTP time source
*
* This sketch uses the UDP supplied with th Ethenet library from 0019
*/
#include <Time.h>
#include <SPI.h>
#include <Ethernet.h>
#include <Udp.h>
#include <TimeAlarms.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] = { 192, 168, 1, 44 }; // set the IP address to an unused address on your network
unsigned int localPort = 8888; // local port to listen for UDP packets
byte timeServer[] = { 192, 43, 244, 18}; // 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
time_t prevDisplay = 0; // when the digital clock was displayed
const long timeZoneOffset = 0L; // set this to the offset in seconds to your local time;
void setup()
{
// start Ethernet and UDP
Ethernet.begin(mac,ip);
Udp.begin(localPort);
pinMode(9,OUTPUT);
Serial.begin(9600);
Serial.println("waiting for sync");
setSyncProvider(getNtpTime);
while(timeStatus()== timeNotSet)
; // wait until the time is set by the sync provider
Alarm.alarmRepeat(7,30,0, SvegliaPC); // 8:30am every day
// Alarm.alarmRepeat(22,29,0, SvegliaPC); // 8:30am every day
}
void SvegliaPC(){
digitalWrite(9,HIGH);
Serial.println("ESEGUITO!");
delay(1000);
digitalWrite(9,LOW);
}
void loop()
{
Alarm.delay(1000);
if( now() != prevDisplay) //update the display only if the time has changed
{
prevDisplay = now();
digitalClockDisplay();
}
}
void digitalClockDisplay(){
// digital clock display of the time
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
Serial.println();
}
void printDigits(int digits){
// utility function for digital clock display: prints preceding colon and leading 0
Serial.print(":");
if(digits < 10)
Serial.print('0');
Serial.print(digits);
}
/*-------- NTP code ----------*/
unsigned long getNtpTime()
{
sendNTPpacket(timeServer); // send an NTP packet to a time server
unsigned long startMillis = millis();
while( millis() - startMillis < 1000) // wait up to one second for the response
{ // wait to see if a reply is available
if ( Udp.available() )
{
Udp.readPacket(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;
// now convert NTP time into Arduino Time format:
// Time starts on Jan 1 1970. In seconds, that's 2208988800:
const unsigned long seventyYears = 2208988800UL;
// subtract seventy years:
unsigned long epoch = secsSince1900 - seventyYears;
return epoch;
}
}
return 0; // return 0 if unable to get the time
}
// send an NTP request to the time server at the given address
unsigned long sendNTPpacket(byte *address)
{
// 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.sendPacket( packetBuffer,NTP_PACKET_SIZE, address, 123); //NTP requests are to port 123
}
