so finaly have manage to get it work this its the code
#include <SPI.h> // needed in Arduino 0019 or later
#include <Ethernet.h>
#include <Twitter.h>
// The includion of EthernetDNS is not needed in Arduino IDE 1.0 or later.
// Please uncomment below in Arduino IDE 0022 or earlier.
//#include <EthernetDNS.h>
int count=0;
int LedState=LOW ;
// Ethernet Shield Settings
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// If you don't specify the IP address, DHCP is used(only in Arduino 1.0 or later).
byte ip[] = { 192, 168, 2, 250 };
// Your Token to Tweet (get it from http://arduino-tweet.appspot.com/)
Twitter twitter("YOUR-TOKEN-HERE");
// Message to post
char* msg;
char str1[]="post one";
char str2[]="post two";
char str3[]="post three";
char str4[]="post four";
char str5[]="post five";
char str6[]="post six";
void setup()
{
digitalWrite(2, HIGH);
attachInterrupt(0, alarm, RISING);
delay(1000);
Ethernet.begin(mac);
// or you can use DHCP for autoomatic IP address configuration.
// Ethernet.begin(mac);
Serial.begin(9600);
}
void loop()
{
if (LedState == HIGH)
{
LedState=LOW;
switch (count)
{ case 1:
msg = str1;
count++;
break;
case 2:
msg = str2;
count++;
break;
case 3:
msg = str3;
count++;
break;
case 4:
msg = str4;
count++;
break;
case 5:
msg = str5;
count++;
break;
case 6:
msg = str6;
count=0;
break;
}
}
Serial.println("connecting ...");
if (twitter.post(msg)) {
// Specify &Serial to output received response to Serial.
// If no output is required, you can just omit the argument, e.g.
// int status = twitter.wait();
int status = twitter.wait(&Serial);
if (status == 200) {
Serial.println("OK.");
} else {
Serial.print("failed : code ");
Serial.println(status);
}
} else {
Serial.println("connection failed.");
}
}
void alarm()
{
LedState = HIGH;
}