File content as of revision 7:d20cc6a9060c:

#include "mbed.h"
#include "LM75B.h"
#include <string>
#include <iostream>
#include <stdio.h>
#include <cstdlib>

LM75B sensor(p28,p27);
Serial pc(USBTX,USBRX);
float TempV; //making a float variable for the temperature value 
float cycles = 300;

LocalFileSystem local("local"); // Create the local filesystem under the name "local"

DigitalOut led1(LED1);
DigitalOut led2(LED2);
Thread Writing_thread;
Thread Read_Calc_thread;

void Writing_thread()
{
    while (true) {
        fp = fopen("/local/temp3.csv", "a"); //Open the file for writing to    
    
    printf("Measuring temp... \n\r"); //Print confirmation of code running      
    while (i<cycles)
    {
        TempV = (float)sensor; //Temperature is the sensor value 

        fprintf(fp, "%.2f\n", TempV); //print values to file 

        i = i+1; // counter
        wait(1); //Wait 1 seconds to 1*300s = 5 minutes         
            
    } //end while loop for writing function
    fclose (fp);//close the file 
        //ThisThread::sleep_for(500);
        //Set trigger to end thread 
    }
}

void Read_Calc_thread()
{
    while (true) 
    {
    
    char temps[5]; //Create a string that will contain temerature values from file

        
    fp = fopen("/local/temp3.csv", "r"); //Open rfile for reading 
            
    //min max total
    double num = 0;
    double total = 0;
    double maxtemp = -99.99;
    double mintemp = 99.99;
            
        while (fscanf(fp, "%s", temps)!= EOF) //scan to end of file
        {          
            num = atof(temps); //string to number --> https://os.mbed.com/questions/7171/How-to-convert-String-to-Float-value/
            
            if(num > maxtemp) //Calculating max number
            {
                maxtemp = num;
            }
            
            if(num < mintemp) //Calculating min number
            {
                mintemp = num; 
            }
                
            total = total+ num;

            //ThisThread::sleep_for(500);
            //Set trigger to end thread
        }   
    }
}

int main () //Main function ***************************************************************************************
{
    FILE *fp = fopen("/local/temp3.csv", "a");  //Create the file
    fclose (fp);                                //Close the file

// Variables 
    int i =0;
//    int j =0;

    
//while (j<288) //144 5 min cycles in 24 hours *** Main while loop for 3 functions, Writing, reading, displaying 
    
    if (sensor.open()) //Try to open the LM75B
    {
        printf("Device detected!\n\r");        
    }    
    else 
    {
        error("Device not detected!\n");
    }//end if sensor open


    thread.start(Writing_thread); //Start first thread
    
    thread.start(Read_Calc_thread(); //Start second thread 


    
//Display function 
    } //while loop creating sting of values from file ends
        double avg = total/(cycles);
        
        printf("Average: %.2f \n\r", avg);
        printf("Max: %.2f \n\r", maxtemp);
        printf("Min: %.2f \n\r", mintemp);
        
        fclose(fp); // close file
    
    //j=j+1 // Controls daily cycle      

   

}   //end main