Problems with temperature sensor DS18B20 using on Arduino pro mini

I have uploaded the folling Sketch successfully.
/* Arduino DS18B20 temp sensor tutorial
More info:
Date: 19/6/2015 // */

//Include libraries
#include <OneWire.h>
#include <DallasTemperature.h>

// Data wire is plugged into pin 2 on the Arduino
#define ONE_WIRE_BUS 2
// Setup a oneWire instance to communicate with any OneWire devices (not just Maxim/Dallas temperature ICs)
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature.
DallasTemperature sensors(&oneWire);

void setup(void)
Serial.begin(9600); //Begin serial communication
Serial.println(“Arduino Digital Temperature // Serial Monitor Version”); //Print a message

void loop(void)
// Send the command to get temperatures
Serial.print("Temperature is: ");
Serial.println(sensors.getTempCByIndex(0)); // Why “byIndex”? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
//Update value every 1 sec.

I can see that the FTDI232 shows serial activity but the activity light on the Pro Mini is not flashing.
The Pro mini is one of the blue variety.

There is an LED on pin 13. But, your sketch is not using it so there will be no flash.

Did you open Tools > Serial Monitor to see if it's printing out the temperature as expected?

Do you have a 4.7k pullup resistor?