Monday, December 26, 2016

Barebone arduino ethernet.

Notice: use at your own risk.


If you have an Arduino with a removable chip, then you can use that to program the chip. Otherwise there are circuits to program the standalone Arduino. See "https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard" for more details".

 


The bare Arduino setup.


You need a power source not shone. We used a 4 D size battery setup. Barebones setup before adding ethernet:



Wiring:







 Downloaded the latest Arduino and Ethercard software. Loaded both of them on the computer. Imported code for a simple web server.

// Present a "Will be back soon web page", as stand-in webserver.
// 2011-01-30 <jc@wippler.nl> http://opensource.org/licenses/mit-license.php

#include <EtherCard.h>

#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[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0x28 };

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

const char page[] PROGMEM =
"HTTP/1.0 503 Service Unavailable\r\n"
"Content-Type: text/html\r\n"
"Retry-After: 600\r\n"
"\r\n"
"<html>"
  "<head><title>"
    "Service Temporarily Unavailable"
  "</title></head>"
  "<body>"
    "<h3>This service is currently unavailable</h3>"
    "<p><em>"
      "The main server is currently off-line.<br />"
      "Please try again later."
    "</em></p>"
  "</body>"
"</html>"
;

void setup(){
  Serial.begin(9600);
  Serial.println("\n[backSoon]\n");
   
  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);
  }
}

Finished setup:



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