Power Up Ethernet Shield W5200 OK until Power Down Up

Using Arduino Networking, Protocols, and Devices
1

Sketch works OK until disconnect/reconnect USB (power) to Arduino UNO.

SETUP: Windows 7, Arduino Uno, W5200 Ethernet Shield, Relay Shield

What do I have to do to make this sketch work stand alone without having to reload sketch after each power up?

#include <SPI.h>
#include <EthernetV2_0.h>
byte mac[] = { 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02 };
IPAddress ip(192,168,200, 2);
IPAddress gateway(192,168,200, 1);
IPAddress subnet(255, 255, 255, 0);
// telnet defaults to port 23
EthernetServer server(23);
#define W5200_CS 10
#define SDCARD_CS 4

// int Relay1 = 4; Relay1 (pin 4) conflicts with W5200 Ethernet Shield)
int Relay2 = 5;
int Relay3 = 6;
int Relay4 = 7;
String commandString;

void setup() {
delay(2000);
pinMode(Relay2, OUTPUT);
pinMode(Relay3, OUTPUT);
pinMode(Relay4, OUTPUT);
pinMode(SDCARD_CS,OUTPUT);
digitalWrite(SDCARD_CS,HIGH);//Deselect the SD card
Ethernet.begin(mac, ip, gateway, subnet);
server.begin();
}

void loop() {
// wait for a new client:
EthernetClient client = server.available();
while (client.available()){
char newChar = client.read();
if (newChar == 0x0D)
{
processCommand(commandString);
// gotAMessage = false;
client.stop();
} else
{
commandString += newChar;
}
}
}
void processCommand(String command)
{
if (command.indexOf("RelayOn") > -1){
digitalWrite(Relay2,HIGH);
digitalWrite(Relay3,HIGH);
digitalWrite(Relay4,HIGH);
commandString = "";
return;
}
if (command.indexOf("RelayOff") > -1){
digitalWrite(Relay2,LOW);
digitalWrite(Relay3,LOW);
digitalWrite(Relay4,LOW);
commandString = "";
return;
}
commandString = "";
}

2

Which w5200 shield are you using? The DFRobot shield has a couple strange setup requirements.

Does it start to work if you press the reset button on the shield/Arduino?

This is incorrect, but may not be the cause of your problem.

// change this
  Ethernet.begin(mac, ip, gateway, subnet);

// to this
  Ethernet.begin(mac, ip, gateway, gateway, subnet);

// or this
  Ethernet.begin(mac, ip);
3

Thank you for your reply.

I am using W5200 Ethernet Shield v2.2 02/20/2014 06A14 by Seeed Studio purchased at Radio Shack

YES, If I press the reset button on the Ethernet Shield it will start working.

What do I need to do to eliminate the pressing of the "reset" button on power up?

==============================================

Why do you say "This is incorrect, but may not be the cause of your problem."

Is the documentation in error?

void setup()
{
// initialize the ethernet device
Ethernet.begin(mac, ip, gateway, subnet);

// start listening for clients
server.begin();
}

My code: Ethernet.begin(mac, ip, gateway, subnet);

You suggest: Ethernet.begin(mac, ip, gateway, gateway, subnet);

4

I don't know what to tell you about the boot problem. I have Due that suffers from the same malady.

The begin function has several prototypes. If you pass only 4 parameters, the last parameter is the gateway. You are using the subnet mask 255.255.255.0 as the gateway.

  void begin(uint8_t *mac_address, IPAddress local_ip);
  void begin(uint8_t *mac_address, IPAddress local_ip, IPAddress dns_server);
  void begin(uint8_t *mac_address, IPAddress local_ip, IPAddress dns_server, IPAddress gateway);
  void begin(uint8_t *mac_address, IPAddress local_ip, IPAddress dns_server, IPAddress gateway, IPAddress subnet);