Attach Ethernet Shield W5100 | UdpNtpClient2

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    This example is a sketch that prints the year / month / date on a serial monitor using the Time Library i and “Ethernet Shield W5100 Attachment | Udp Ntp Client Example”.

     

    1. Materials and circuits

     

    You will need an Ethernet shield board, an Arduino board or a mega board. You must have an Internet router (router or DHCP server) to be assigned an IP address.

     

     

    materials

    =====

    • Arduno board
    • Ethernet shield board
    • Internet router
    • Internet line

     

    Circuit configuration

    =======

     

    The circuit configuration is not required, but the Ethernet shield is attached to the Arduino board and connected to the Internet.

     

    2. Sketch Description

     

    Time library uses Unix time, so 1970/1/1 is the base date (start date), and NTP use 1900/1/1 as the base date using UTC (Greenwich Meridian Time). You have to subtract the value from the 1900/1/1 to the 1969/12/31 hours (365 * 70 + 17 (number of leap years)) * 24 hours * 60 minutes * 60 seconds = 2208988800. With this value, I got the year, month, and day using the year (), month (), and day () functions of the Time library.

     

    Also, Korea Standard Time is 9 o’clock faster than UTC, so we changed it to 9 * 60 * 60 = 9 * 3600 seconds in addition to Unix Time.

     

     

    sketch

    =====

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    /* 
      Udp NTP Client 2
      
     For more information about the NTP time server and the messages it sends and receives
     Please refer to: http://en.wikipedia.org/wiki/Network_Time_Protocol
     
    It was created by Michael Margolis on September 04, 2010,
    Modified by Tom Igoe on April 09, 2012
     
    This code is a shared asset.
     */ 
     
    #include <SPI.h> 
    #include <Ethernet.h> 
    #include <EthernetUdp.h> 
    #include <Time.h> 
     
    // put in the MAC address for the Ethernet controller
    // The new Ethernet shield has the MAC address printed on the sticker
    byte mac[] = { 
      0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED 
    }; 
     
    unsigned int localPort = 8888;       // local port to receive UDP packets
    char timeServer[] = “time.nist.gov”; // time.nist.gov NTP server
    const int NTP_PACKET_SIZE = 48;// Size of the NTP message (packet data)
    byte packetBuffer[ NTP_PACKET_SIZE];// Buffer for sending and receiving packets
     
    // UDP instance (object) to send / receive packets using UDP protocol
    EthernetUDP Udp; 
     
    void setup() 
    { 
     // Open the serial communication and wait for the serial communication to be connected:
      Serial.begin(9600); 
      while (!Serial) { 
        ;// Wait for the serial port to connect. Requires only Leonardo board
      } 
     
      // Start Ethernet and UDP
      if (Ethernet.begin(mac) == 0) { 
        Serial.println(“Failed to configure Ethernet using DHCP”); 
      // no more to run and infinite looping:`
        for (;;) 
          ; 
      } 
      Udp.begin(localPort); 
    } 
     
    void loop() 
    { 
      sendNTPpacket(timeServer); // Send an NTP packet to the time server
     
    // Check if the response came
      delay(1000); 
      if ( Udp.parsePacket() ) { 
        // Get the data from the received response packet
        Udp.read(packetBuffer, NTP_PACKET_SIZE);// Load the packet into the buffer
     
        // The timestamp starts at the 40th byte of the received packet and consists of 4 bytes (2
    // word or long). 2 Separate word data.
        unsigned long highWord = word(packetBuffer[40], packetBuffer[41]); 
        unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]); 
     
        // Create a integer in long type by combining 4byte(2word) 
        // NTP time (seconds since January 1, 1900 to the present)
    // calculate):
        unsigned long secsSince1900 = highWord << 16 | lowWord; 
        Serial.print(“seconds(秒) time : ” ); 
        Serial.println(secsSince1900); 
     
        // Convert NTP time to day time:
        Serial.print(“Unix   time : “); 
        //Unix time starts on January 1, 1970, and is calculated in seconds
        //2208988800 is:
        const unsigned long seventyYears = 2208988800UL; 
        // Subtract the corresponding seconds in 70 years:
        unsigned long epoch = secsSince1900 – seventyYears; 
        // Output the Unix time:
        Serial.println(epoch); 
     
        int hour, minute, second; 
        // Print Coordinated Universal Time:: 
        Serial.print(“Coordinated Universal Time: : “); // UTC is Greenwich 
                                       // Meridian Time:GM. 
        hour = (epoch % 86400L) / 3600;// 1day = 86400sec, 1h = 3600sec 
        minute = (epoch % 3600) / 60;  // 1h = 3600sec, 1m = 60sec  
        second = epoch % 60;           // 1m = 60sec 
         
        printTime(hour, minute, second); 
        Serial.print(” “); 
        printDate(year(epoch), month(epoch), day(epoch)); 
        Serial.println(); 
         
        // output Korean Standard Time:
        Serial.print(” Korean Standard Time : “); 
        hour = (hour + 9) % 24;        // Korean Standard Time = GMT + 9 
        printTime(hour, minute, second);  
     
        epoch += 9 * 3600;  // GMT + 9 * 60 * 60 
        Serial.print(” “); 
        printDate(year(epoch), month(epoch), day(epoch)); 
        Serial.println(); 
      } 
      Serial.println(); 
       
      // After 10 seconds, ask the time again from the NTP server and output it 
      delay(10000); 
    } 
     
    // Send an NTP request to the given NTP server address
    unsigned long sendNTPpacket(char* address) 
    { 
      //  Make all the data 0 in the buffer
      memset(packetBuffer, 0, NTP_PACKET_SIZE); 
      // Initialize the necessary values ​​to create an NTP request message 
      // (See the URL above for more information about the packet)
      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 are filled with the given value,
      // Now we can send the packet to get  timestampt:
      Udp.beginPacket(address, 123); // NTP request to port 123
      Udp.write(packetBuffer, NTP_PACKET_SIZE); 
      Udp.endPacket(); 
    } 
     
    // print hour, minute and second
    void printTime(int hour, int minute, int second) 
    { 
      print2digits(hour);   
      Serial.print(‘:’); 
      print2digits(minute); 
      Serial.print(‘:’); 
      print2digits(second); 
    } 
     
    // Print year, month, and date
    void printDate(int year, int month, int day) 
    { 
        Serial.print(year); 
        Serial.print(“/”); 
        Serial.print(month); 
        Serial.print(“/”); 
        Serial.print(day); 
    } 
     
    // Output the number as two-digit number
    void print2digits(int number) 
    { 
       if(number < 10) { 
         Serial.print(‘0’); 
       } 
       Serial.print(number); 
    } 
     
    Colored by WayFarer™

     

    3. Execution result 

    When I pressed the button to upload the sketch, an error occurred in the time library that I used well. It seems that the problem of using flash memory as a data area after upgrading to Arduino IDE 1.5.8 is a little more strict. Based on the error message, modify the Time library to upload successfully, open the serial monitor window, and finally the desired date will start to appear on the screen.

     

     

       

     

    For reference, place the URL of the Time library and the modified DateStrings.cpp library file in the attachment.

    Time Library: http://playground.arduino.cc/Code/Time

     

    Date : Oct 21, 2014
    Author : 과객

    Source : http://blog.naver.com/msyang59/220157017996

     

    This example is a sketch that prints the year / month / date on a serial monitor using the Time Library i and “Ethernet Shield W5100 Attachment | Udp Ntp Client Example”.

     

    1. Materials and circuits

     

    You will need an Ethernet shield board, an Arduino board or a mega board. You must have an Internet router (router or DHCP server) to be assigned an IP address.

     

     

    materials

    =====

    • Arduno board
    • Ethernet shield board
    • Internet router
    • Internet line

     

    Circuit configuration

    =======

     

    The circuit configuration is not required, but the Ethernet shield is attached to the Arduino board and connected to the Internet.

     

    2. Sketch Description

     

    Time library uses Unix time, so 1970/1/1 is the base date (start date), and NTP use 1900/1/1 as the base date using UTC (Greenwich Meridian Time). You have to subtract the value from the 1900/1/1 to the 1969/12/31 hours (365 * 70 + 17 (number of leap years)) * 24 hours * 60 minutes * 60 seconds = 2208988800. With this value, I got the year, month, and day using the year (), month (), and day () functions of the Time library.

     

    Also, Korea Standard Time is 9 o’clock faster than UTC, so we changed it to 9 * 60 * 60 = 9 * 3600 seconds in addition to Unix Time.

     

     

    sketch

    =====

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    /* 
      Udp NTP Client 2
      
     For more information about the NTP time server and the messages it sends and receives
     Please refer to: http://en.wikipedia.org/wiki/Network_Time_Protocol
     
    It was created by Michael Margolis on September 04, 2010,
    Modified by Tom Igoe on April 09, 2012
     
    This code is a shared asset.
     */ 
     
    #include <SPI.h> 
    #include <Ethernet.h> 
    #include <EthernetUdp.h> 
    #include <Time.h> 
     
    // put in the MAC address for the Ethernet controller
    // The new Ethernet shield has the MAC address printed on the sticker
    byte mac[] = { 
      0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED 
    }; 
     
    unsigned int localPort = 8888;       // local port to receive UDP packets
    char timeServer[] = “time.nist.gov”; // time.nist.gov NTP server
    const int NTP_PACKET_SIZE = 48;// Size of the NTP message (packet data)
    byte packetBuffer[ NTP_PACKET_SIZE];// Buffer for sending and receiving packets
     
    // UDP instance (object) to send / receive packets using UDP protocol
    EthernetUDP Udp; 
     
    void setup() 
    { 
     // Open the serial communication and wait for the serial communication to be connected:
      Serial.begin(9600); 
      while (!Serial) { 
        ;// Wait for the serial port to connect. Requires only Leonardo board
      } 
     
      // Start Ethernet and UDP
      if (Ethernet.begin(mac) == 0) { 
        Serial.println(“Failed to configure Ethernet using DHCP”); 
      // no more to run and infinite looping:`
        for (;;) 
          ; 
      } 
      Udp.begin(localPort); 
    } 
     
    void loop() 
    { 
      sendNTPpacket(timeServer); // Send an NTP packet to the time server
     
    // Check if the response came
      delay(1000); 
      if ( Udp.parsePacket() ) { 
        // Get the data from the received response packet
        Udp.read(packetBuffer, NTP_PACKET_SIZE);// Load the packet into the buffer
     
        // The timestamp starts at the 40th byte of the received packet and consists of 4 bytes (2
    // word or long). 2 Separate word data.
        unsigned long highWord = word(packetBuffer[40], packetBuffer[41]); 
        unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]); 
     
        // Create a integer in long type by combining 4byte(2word) 
        // NTP time (seconds since January 1, 1900 to the present)
    // calculate):
        unsigned long secsSince1900 = highWord << 16 | lowWord; 
        Serial.print(“seconds(秒) time : ” ); 
        Serial.println(secsSince1900); 
     
        // Convert NTP time to day time:
        Serial.print(“Unix   time : “); 
        //Unix time starts on January 1, 1970, and is calculated in seconds
        //2208988800 is:
        const unsigned long seventyYears = 2208988800UL; 
        // Subtract the corresponding seconds in 70 years:
        unsigned long epoch = secsSince1900 – seventyYears; 
        // Output the Unix time:
        Serial.println(epoch); 
     
        int hour, minute, second; 
        // Print Coordinated Universal Time:: 
        Serial.print(“Coordinated Universal Time: : “); // UTC is Greenwich 
                                       // Meridian Time:GM. 
        hour = (epoch % 86400L) / 3600;// 1day = 86400sec, 1h = 3600sec 
        minute = (epoch % 3600) / 60;  // 1h = 3600sec, 1m = 60sec  
        second = epoch % 60;           // 1m = 60sec 
         
        printTime(hour, minute, second); 
        Serial.print(” “); 
        printDate(year(epoch), month(epoch), day(epoch)); 
        Serial.println(); 
         
        // output Korean Standard Time:
        Serial.print(” Korean Standard Time : “); 
        hour = (hour + 9) % 24;        // Korean Standard Time = GMT + 9 
        printTime(hour, minute, second);  
     
        epoch += 9 * 3600;  // GMT + 9 * 60 * 60 
        Serial.print(” “); 
        printDate(year(epoch), month(epoch), day(epoch)); 
        Serial.println(); 
      } 
      Serial.println(); 
       
      // After 10 seconds, ask the time again from the NTP server and output it 
      delay(10000); 
    } 
     
    // Send an NTP request to the given NTP server address
    unsigned long sendNTPpacket(char* address) 
    { 
      //  Make all the data 0 in the buffer
      memset(packetBuffer, 0, NTP_PACKET_SIZE); 
      // Initialize the necessary values ​​to create an NTP request message 
      // (See the URL above for more information about the packet)
      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 are filled with the given value,
      // Now we can send the packet to get  timestampt:
      Udp.beginPacket(address, 123); // NTP request to port 123
      Udp.write(packetBuffer, NTP_PACKET_SIZE); 
      Udp.endPacket(); 
    } 
     
    // print hour, minute and second
    void printTime(int hour, int minute, int second) 
    { 
      print2digits(hour);   
      Serial.print(‘:’); 
      print2digits(minute); 
      Serial.print(‘:’); 
      print2digits(second); 
    } 
     
    // Print year, month, and date
    void printDate(int year, int month, int day) 
    { 
        Serial.print(year); 
        Serial.print(“/”); 
        Serial.print(month); 
        Serial.print(“/”); 
        Serial.print(day); 
    } 
     
    // Output the number as two-digit number
    void print2digits(int number) 
    { 
       if(number < 10) { 
         Serial.print(‘0’); 
       } 
       Serial.print(number); 
    } 
     
    Colored by WayFarer™

     

    3. Execution result 

    When I pressed the button to upload the sketch, an error occurred in the time library that I used well. It seems that the problem of using flash memory as a data area after upgrading to Arduino IDE 1.5.8 is a little more strict. Based on the error message, modify the Time library to upload successfully, open the serial monitor window, and finally the desired date will start to appear on the screen.

     

     

       

     

    For reference, place the URL of the Time library and the modified DateStrings.cpp library file in the attachment.

    Time Library: http://playground.arduino.cc/Code/Time

     

    Date : Oct 21, 2014
    Author : 과객

    Source : http://blog.naver.com/msyang59/220157017996

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