Ethernet W5100 R3 network expansion shield สำหรับ MEGA module UNO

Ethernet W5100 R3 network expansion shield สำหรับ MEGA module UNO

The Ethernet expansion board allows the controller to connect to the network. It is an expansion board with built-in WizNet W5100 TCP/IP microprocessor. This board is connected to the board by a long pin header (wire-wrap header). You can easily use this expansion board to connect to the network using the Ethernet library program in the IDE. This expansion board supports simultaneous connection of 4 sockets.

And the R3 version of this expansion board also adds a standard version 1.0 output port composed of 4 additional ports: 2 are located on the side of ARFF, and 2 are located on the side of RESET. Two ports on the side of RESET, one is IOREF, which is used to adapt the expansion board to the main board. Another empty port is reserved for future expansion.

This version of this version adds a micro-SD card slot and has a network storage function. In addition, it is fully compatible with Duemilanove and Mega series. It also has an independent PoE (power-over-Ethernet) module. The module can be soldered to the motherboard to transmit power through twisted-pair cables. This is in line with the IEEE802.3af standard and is compatible with existing PoE modules.

Technical specifications

Compatible with Mega2560/Uno rev3 standard output port

PoEreset controller for micro-SD card connector with active voltage converter function

Compatible with MEGA board

ตัวอย่างโค้ด UNO ทดสอบเรียกวันที่และเวลาจากเซิฟร์เวอร์ NTP 

1. #include <Arduino.h> 
2. #include <SPI.h>
3. #include <Ethernet.h>
4. #include <EthernetUdp.h>
5.  
6. byte mac[] = {
7.   0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
8. };
9.  
10. unsigned int localPort = 8888;  
11.  
12. const char timeServer[] = "time.nist.gov"; 
13.  
14. const int NTP_PACKET_SIZE = 48;  
15.  
16. byte packetBuffer[NTP_PACKET_SIZE]; 
17.  
18. EthernetUDP Udp;
19. void sendNTPpacket(const char * address);
20.  
21. void setup() { 
22.   Ethernet.init(10);  
23.   Serial.begin(9600); 
24.   Serial.println("Start");
25.  
26.   if (Ethernet.begin(mac) == 0) {
27.     Serial.println("Failed to configure Ethernet using DHCP"); 
28.     if (Ethernet.hardwareStatus() == EthernetNoHardware) {
29.       Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
30.     } else if (Ethernet.linkStatus() == LinkOFF) {
31.       Serial.println("Ethernet cable is not connected.");
32.     } 
33.   }
34.   Udp.begin(localPort);
35. }
36.  
37. void loop() {
38.   sendNTPpacket(timeServer);  
39.  
40.   delay(1000);
41.   if (Udp.parsePacket()) { 
42.     Udp.read(packetBuffer, NTP_PACKET_SIZE); // read the packet into the buffer
43.  
44.  
45.     unsigned long highWord = word(packetBuffer[40], packetBuffer[41]);
46.     unsigned long lowWord = word(packetBuffer[42], packetBuffer[43]); 
47.     unsigned long secsSince1900 = highWord << 16 | lowWord;
48.     Serial.print("Seconds since Jan 1 1900 = ");
49.     Serial.println(secsSince1900);
50.  
51.     Serial.print("Unix time = "); 
52.     const unsigned long seventyYears = 2208988800UL; 
53.     unsigned long epoch = secsSince1900 - seventyYears; 
54.     Serial.println(epoch);
55.  
56.     Serial.print("The UTC time is ");       // UTC is the time at Greenwich Meridian (GMT)
57.     Serial.print((epoch  % 86400L) / 3600); // print the hour (86400 equals secs per day)
58.     Serial.print(':');
59.     if (((epoch % 3600) / 60) < 10) {
60.       // In the first 10 minutes of each hour, we'll want a leading '0'
61.       Serial.print('0');
62.     }
63.     Serial.print((epoch  % 3600) / 60); // print the minute (3600 equals secs per minute)
64.     Serial.print(':');
65.     if ((epoch % 60) < 10) {
66.       // In the first 10 seconds of each minute, we'll want a leading '0'
67.       Serial.print('0');
68.     }
69.     Serial.println(epoch % 60); // print the second
70.   }
71.   // wait ten seconds before asking for the time again
72.   delay(1000);
73.   Ethernet.maintain();
74. }
75.  
76. void sendNTPpacket(const char * address) {
77.   // set all bytes in the buffer to 0
78.   memset(packetBuffer, 0, NTP_PACKET_SIZE); 
79.   packetBuffer[0] = 0b11100011;   // LI, Version, Mode
80.   packetBuffer[1] = 0;     
81.   packetBuffer[2] = 6;    
82.   packetBuffer[3] = 0xEC;   
83.   packetBuffer[12]  = 49;
84.   packetBuffer[13]  = 0x4E;
85.   packetBuffer[14]  = 49;
86.   packetBuffer[15]  = 52; 
87.   Udp.beginPacket(address, 123); // NTP requests are to port 123
88.   Udp.write(packetBuffer, NTP_PACKET_SIZE);
89.   Udp.endPacket();
90. }