lilypad usb temp sensor using ds1621

hi im having trouble appling code lilypad aurduino usb , wondering if point me in right direction im going wrong?  code im using below:

#include <wire.h>

// simple ds1621 demo
// -- jon mcphalen (www.jonmcphalen.com)
// -- 19 dec 2007


// ds1621 has a2, a1, , a0 pins connected gnd


#define dev_id 0x90 >> 1                    // shift required wire.h


void setup()
{
 serial.begin(9600);

 wire.begin();
 wire.begintransmission(dev_id);           // connect ds1621 (#0)
 wire.write(0xac);                          // access config
 wire.write(0x02);                          // set continuous conversion
 wire.begintransmission(dev_id);           // restart
 wire.write(0xee);                          // start conversions
 wire.endtransmission();
}


void loop()
{
 int tempc = 0;
 int tempf = 0;

 delay(1000);                              // give time measurement
 wire.begintransmission(dev_id);
 wire.write(0xaa);                          // read temperature
 wire.endtransmission();
 wire.requestfrom(dev_id, 1);              // request 1 byte ds1621
 tempc = wire.read();                   // whole degrees reading
 tempf = tempc * 9 / 5 + 32;               // convert fahrenheit

 serial.print(tempc);
 serial.print(" / ");
 serial.println(tempf);
}

by applying, mean uploading unmodified sketch written else? if so, expect work, first place @ hardware.

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