File content as of revision 0:26ab4d6016ae:

#include "mbed.h"
Timeout response;

DigitalOut green(LED_GREEN);
DigitalOut red(LED_RED);
DigitalOut led(D6); 
DigitalIn  sw2(SW2);
Serial pc(USBTX, USBRX );
Serial blue(PTC15, PTC14); //tx, rx

int main()
{
    int flag = 0; 
    char hold = 'b';
    char recieved; 
    char send = 'Z';
    pc.baud(9600);
    blue.baud(9600);
    printf("Master connecting to the slave\n");

    while (true) {

        blue.putc(send);
        wait(0.5f); // wait a small period of time       

        if(blue.readable())//Determine if there is a character available to read.
        {
               
               //--------------------------Temperature Module-----------------------------
               

                recieved = blue.getc();
                //printf("\n word = %c \n\r", recieved);
                int RANGE = ((recieved) - '0');
                float RANGEFIXED = RANGE; 

                
                //--------------------------Temperature Module End----------------------------
                
                
                pc.printf("\n Lock Mode: unknown person(s) within = %f Units  \n\r", RANGEFIXED);  
                if(RANGEFIXED < 49)
                {
                     pc.printf("\nAlert Triggered\n\r");  
                     flag = 1; 
             
                }    
                else   
                {
                    pc.printf("\n All Clear \n\r"); 
                    flag = 0; 
                }
                    
        }
        
        if(flag == 1)
            for(int timer = 0; timer < 10; timer++)
            {
                wait(0.05f); 
                led = !led;
            }
                
    }

}