Revision 0:b83e5e826d81, committed 2016-02-24

Comitter:

roberthill04

Date:

Wed Feb 24 17:42:35 2016 +0000

Commit message:

This is the Hall Effect Demo Program, testing the functionality of the hall effect as a means of finding pedal speed while riding a bike.;

Changed in this revision

diff -r 000000000000 -r b83e5e826d81 HallEffect.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HallEffect.cpp	Wed Feb 24 17:42:35 2016 +0000
@@ -0,0 +1,85 @@
+#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****
+      }
+}

diff -r 000000000000 -r b83e5e826d81 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Feb 24 17:42:35 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/252557024ec3
\ No newline at end of file