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Adding Ethernet + Arduino = Network Device


Your Arduino project needs Internet connectivity, and you want it cheap as well? Spend a couple of dollars and less than an hour, and you will have it.

What you need.

Connect jumper wires as below.

  • ENC SO -> Arduino pin 12
  • ENC SI -> Arduino pin 11
  • ENC SCK -> Arduino pin 13
  • ENC CS -> Arduino pin 8
  • ENC VCC -> Arduino 3V3 pin
  • ENC GND -> Arduino Gnd pin

If you have done this right, the LEDs on the module will light up when the Arduino is powered on. Now plug in an Ethernet cable, and the LEDs on the Ethernet connector should light up in a few seconds, showing local Ethernet traffic.

Now finally to program the Arduino using the Arduino IDE.

Program code

// This is a demo of the RBBB running as webserver with the Ether Card
// 2010-05-28 <jc@wippler.nl> http://opensource.org/licenses/mit-license.php

#include <EtherCard.h>

// ethernet interface mac address, must be unique on the LAN
static byte mymac[] = { 0x74,0x69,0x69,0x2D,0x30,0x31 };
static byte myip[] = { 192,168,1,203 };

byte Ethernet::buffer[500];
BufferFiller bfill;

void setup () {
  if (ether.begin(sizeof Ethernet::buffer, mymac) == 0)
    Serial.println( "Failed to access Ethernet controller");
  ether.staticSetup(myip);
}

static word homePage() {
  long t = millis() / 1000;
  word h = t / 3600;
  byte m = (t / 60) % 60;
  byte s = t % 60;
  bfill = ether.tcpOffset();
  bfill.emit_p(PSTR(
    "HTTP/1.0 200 OK\r\n"
    "Content-Type: text/html\r\n"
    "Pragma: no-cache\r\n"
    "\r\n"
    "<meta http-equiv='refresh' content='1'/>"
    "<title>RBBB server</title>"
    "<h1>$D$D:$D$D:$D$D</h1>"),
      h/10, h%10, m/10, m%10, s/10, s%10);
  return bfill.position();
}

void loop () {
  word len = ether.packetReceive();
  word pos = ether.packetLoop(len);
  
  if (pos)  // check if valid tcp data is received
    ether.httpServerReply(homePage()); // send web page data
}

Now this if you try to compile, it will throw an error 

Compilation error: EtherCard.h: No such file or directory

This is because the library was not added before. To to Tools > Manage libraries (Ctrl+Shift+i)  and type in EtherCard and install the the library by Jean-Claude Wippler and click on Upload again.

Alternatively you can also find it on here https://github.com/njh/EtherCard/archive/master.zip

Now, with this done you can ahead and let your creativity to implement in ways that suits your project. Good luck!


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