File content as of revision 4:e61cd14ec4f0:

#include "mbed.h"
#include <time.h>
#include <string>
#include <iostream>
 
Serial pc(USBTX, USBRX); // tx, rx                                          //defines the communication between MBed and pc
DigitalIn input(p8);                                                        //input from diode. Digital 1 is beam unbroken?
DigitalOut led(LED1);                                                       //testing purposes 


int main() {
    int line = 0;                                                           //line counter
    pc.printf("new program \n");                                            //lert user of initialisation  
      
    while(1) {                                                              //loops continuously 
        if (input)                                                          //checks the digital input from the diode.
        {
            pc.printf("Message  %d : \t", line);
            pc.printf("DigitalIn: 1 \n");   
            led = 1;
            line = line + 1;
         
        }
       else
       {
                pc.printf("Message %d : \t", line);
                pc.printf("DigitalIn 0\n");              
                led = 0;
                line = line + 1   ;        
              
        }
    }
}