Arduino : use an ethernet controller (enc28j60)

Here below a quick how to use an arduino and a cheap enc28j60 ethernet module (5€).

Can be handy to built a quick web server and some sensors (like a ds18b20 for example).

below the wiring :

below a sketch using the ethercard library (provided with Arduino GUI) :

// Present a "Will be back soon web page", as stand-in webserver.
// 2011-01-30  http://opensource.org/licenses/mit-license.php
 
#include 

#define STATIC 0  // set to 1 to disable DHCP (adjust myip/gwip values below)

#if STATIC
// ethernet interface ip address
static byte myip[] = { 192,168,1,200 };
// gateway ip address
static byte gwip[] = { 192,168,1,1 };
#endif

// ethernet mac address - must be unique on your network
static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };

byte Ethernet::buffer[500]; // tcp/ip send and receive buffer

char page[] PROGMEM =
"HTTP/1.0 200 OK\r\n"
"Content-Type: text/html\r\n"
"Retry-After: 600\r\n"
"\r\n"
""
  ""
  ""
    "
hello world !
"
  ""
""
;

void setup(){
  Serial.begin(38400);
  Serial.println("\n[backSoon]");
  
  if (ether.begin(sizeof Ethernet::buffer, mymac) == 0) 
    Serial.println( "Failed to access Ethernet controller");
#if STATIC
  ether.staticSetup(myip, gwip);
#else
  if (!ether.dhcpSetup())
    Serial.println("DHCP failed");
#endif

  ether.printIp("IP:  ", ether.myip);
  ether.printIp("GW:  ", ether.gwip);  
  ether.printIp("DNS: ", ether.dnsip);  
}

void loop(){
  // wait for an incoming TCP packet, but ignore its contents
  if (ether.packetLoop(ether.packetReceive())) {
    memcpy_P(ether.tcpOffset(), page, sizeof page);
    ether.httpServerReply(sizeof page - 1);
  }
}