File content as of revision 0:b83e5e826d81:

#include "mbed.h"
#include "AnalogIn.h"           //not sure if this is necessary 
#include "DigitalIn.h"          //^^^ 

DigitalOut led_red(LED_RED);
DigitalOut led_green(LED_GREEN);
DigitalOut led_blue(LED_BLUE);
DigitalIn sw2(SW2);
DigitalIn sw3(SW3);
Serial pc(USBTX, USBRX);

//LED is ON when set to 0, OFF when set to 1
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
DigitalIn HallEffect(D2);    //Intializes Digital input into pin D2 (Hall Effect sensor)


int Hall_Counter = 0;            //Initialize Counter for Hall Effect
bool Low_Hall = true;            //Initialize Flag for Hall Effect sensor
bool Button_Pressed = true;     //Initialize flag for output on terminal
Timer Hall_Timer;              //Initialize timer for pedal speed calc
int Pedal_Time;                 //Intialize int for Time Passed 
int Pedal_Speed;                //Initialize int for Pedal Speed
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void Hall_Effect_Count(void)
{
    if (sw3 == 0 && Button_Pressed == true) { 
    //led_blue =  0;                                       //Blue LED is ON
    //led_green = 1;
    //led_red =   1;
    pc.printf("Number of times magnet has passed sensor: %d\n", Hall_Counter);                //Outputs # of times magnet passed sensor
    Hall_Timer.stop();                  //stop the timer
    pc.printf("Time passed (in seconds): %f \n", Hall_Timer.read());                                   //Outputs time in seconds
    Pedal_Time=Hall_Timer.read()/60;                                        //Divides Time in seconds by 60 so we have minutes for Pedal_Speed (RPM)
    Pedal_Speed=Hall_Counter/(Hall_Timer.read()/60);                           
    pc.printf("Approximate pedal speed: %d RPM\n", Pedal_Speed);                          //Outputs pedal speed
    Button_Pressed = false;
    //Hall_Timer.reset();                         //idea here is the timer is reset after the program outputs the pedal speed so the demo can be reran
    }
}

int main() {
    led_blue=1;
    led_red=0;
    led_green=1;
    pc.baud(9600);
    pc.printf("Hello World from FRDM-K64F board. This is the Hall Effect Demo Program. ");
    pc.printf("Press SW3 (Button Near LED on board) to see Pedal Speed.\n ");
    Hall_Timer.start();             //Starts Timer for Pedal Speed Calculation **see if this is better in loop or out**
                                    //Looks like it works better here (Feb. 10)



   
    while (1){                                                                                   //infinite loop
        //Hall_Timer.start();                                                                      //Start the timer ***See if timer works here or above while loop
        Button_Pressed = true;                                       
         if(HallEffect==0 && Low_Hall==true) {                                           //If Hall Effect Digital Output is low 
            Hall_Counter++;                                                              //Add one to counter for calc pedal speed
            led_green = 0;                                                               //Output Green on LED, simulates wheel rotation "sensed"
            led_red = 1;                                                                 
            led_blue = 1;
            Low_Hall = false;                                                            //flag to avoid errors                        
         }
         else if(HallEffect==1 && Low_Hall==true){                                //Additional logic for accurate readings 
            led_green = 1;
            led_red = 0;                                                         //Stays red while hall effect outputs digital high
            led_blue = 1;
         }
          else if(HallEffect==0 && Low_Hall==false){                                                       
            led_green = 0;
            led_red = 1; 
            led_blue = 1;
            
         }
         else if(HallEffect==1 && Low_Hall==false){
            led_green = 1;
            led_red = 0;
            led_blue = 1;
            Low_Hall = true;
         }
         Hall_Effect_Count();
         //wait(5.0f); //LOOK at this, this may be why the button isnt working****
      }
}