File content as of revision 59:2cbbd6fea55b:

#include "mbed.h"
#include <time.h>
#include <string>
#include <iostream>
#include "Distance.h"

void printArray(double array[20], double timesArray[20], int NoOfPins);
void data(int sensor_number, double time, double speed);

 //mbed pins
extern Serial pc;                                                                   //defines the communication between MBed and pc
//int NoOfPins = 3;                                                                         //for how many sensors there are       
DigitalIn sensor[20] = {p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23,p24} ;                                                 //array of sensors.  

 
//c++ variables
   
    Timer t;
    double timeDiff;                          //time between 2 sensors - not used right now   
    double speed;
    double times[20];                                //array the size of #pins
    double speeds[20];                                //array of speeds     
    

      
int calculate(double distance, int NoOfPins)
{
    
    //pc.printf("new program \n");                                            //alert user of initialisation   
     
    int i = 0; 
    while( i < NoOfPins)
    {
        while(!sensor[i]) 
        {
            if(sensor[i + 1])
             {
                //printf("it skipped sensor % d", i);
                i++; 
                
                }                                                         //error checking incase next one is done
        }
        t.start();                                                              //starts the timer
        timeDiff =  t.read();                                                       //reads what the timer is currently at
        t.reset();                                                                 //starts the timer again from 0.
        times[i] = timeDiff;                                                 //adds sensor times to array for logging.
      //  pc.printf(" timediff: %lf s \t", timeDiff); 
        if ( i > 0) 
        {                                                       //to ensure it is not the first one
                 speed = distance / timeDiff;
                 pc.printf(" speed : %f m/s \n", speed); 
                 speeds[i] = speed;
        }
        i++;
    } 
      pc.printf(" \n Calculate completed \n");                                      //alert to let user know it completed
     // printArray(speeds, times, NoOfPins);
  
}

void printArray(double array[20], double timesArray[20], int NoOfPins)
      {
        for (int i = 0; i < NoOfPins ; i++)                                     //printing module for array                              
        {
             pc.printf(" Sensor : %d    Time %lf    Speed %f  \n", i,times[i],speeds[i]); 
          //   pc.printf(" %d : %d  \t", i,times[i]); 
         }
         for (int i = 0; i < NoOfPins ; i++)                                     //printing to Datalog                            
        {
             data( i,times[i],speeds[i]); 
         }
         
      }