File content as of revision 71:60f06e7e50a3:

#include "mbed.h"
#include <string>

LocalFileSystem local("local"); 
extern Serial pc;

void initialise(int counter, string date )
{ 
    FILE *fp1 = fopen("/local/Datalog.xls", "a");       // opens or creates fill Datalog, 
    fprintf(fp1, " Test %d \n %s \n", counter, date);                   //gives header
    fprintf(fp1, " Sensor \t Total Time \t Time Diff \t Inst Speed \t Avg Speed\n");                    //writes field names
    fclose(fp1);                                            //closes the file so it can be opened by another method
}

void data(int sensor_number, double time, double speed, double timesTotal,double speedAvg)
{
    FILE *fp = fopen("/local/Datalog.xls", "a");                                                                // Open "Datalog
    fprintf(fp, " %d \t %lf \t %lf \t %lf \t %lf \n",sensor_number + 1, timesTotal ,time, speed, speedAvg);       //fills the tables with the results. sensorNumber +1 because sensor starts at 0.
    fclose(fp);                                                                                                   //close
}
    
//*********This has not been done yet, but it would be nice to have an average speed for each bend********
void averageData()                                        //adds average data fom b2 to b6
{ 
    FILE *fp2 = fopen("/local/Datalog.xls", "a");       
    fprintf(fp2, " Average \t=SUM(B2:B4) / 5 \n"); 
    fclose(fp2);
}