Diff: main.cpp

Revision:

0:e05fd3c9c4b3

Child:

1:37f2341e763b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jun 15 20:21:07 2010 +0000
@@ -0,0 +1,77 @@
+// Program monitors the temperature recorded on the EA LPCXpresso board's U7
+// There is an option to either display the temperature on the OLED or write to an SD card
+// If writing to an SD card, be sure to only unplug the MBED or remove the SD card when LED3 is illuminated
+// Removing power or the SD card when LED3 is not illuminated will result in a loss of data
+// Temperature is monitored every 6 seconds in the current code
+
+#include "mbed.h"
+#include "EAOLED.h"
+#include "SDFileSystem.h"
+
+SDFileSystem sd(p5, p6, p7, p24, "sd"); //Used for file system writes to the EA SD card.  Comment this out if displaying on OLED.
+DigitalOut myled1(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+//EAOLED oled(p5, p6, p7, p8, p25); // mosi, dnc, sclk, cs, power ***this is only used if displaying temp on OLED instead of file writing***
+InterruptIn sense(p8); //make sure EA board J25 is set to PIO0_2  ***if using the OLED, must change this to pin 10 and connect wire from J25 center pin to pin10 on mBed, make sure J25 does not have a jumper populated***
+
+Timer timer; //timer used for keeping track of elapesd time
+Timeout timeout; //timeout used for calculation of frequency
+int edgecount, on, seconds;
+float temp, freq, tempf;
+
+void edge(){
+    edgecount = edgecount++;
+}
+
+void attimeout(){
+    on = 0;
+}
+
+int main() {
+//    oled.cls(); //*** make sure this is not commented out if using the OLED
+//    oled.locate(0,0); //*** make sure this is not commented out if using the OLED
+//    oled.printf("Frequency:"); //*** make sure this is not commented out if using the OLED
+//    oled.locate(0,2); //*** make sure this is not commented out if using the OLED
+//    oled.printf("Temperature:"); //*** make sure this is not commented out if using the OLED
+    myled1 = 1; //indicates the program is running
+    timer.start(); //starts the tracking timer.  Can comment this out if using the OLED.
+    FILE *fp = fopen("/sd/temperat.csv", "w"); //formats the file header. Comment this out if using the OLED.
+    fprintf(fp,"Time, Freq, TempC, TempF\n"); //Comment this out if using the OLED
+    fclose(fp); //Comment this out if using the OLED
+    
+    while(1){
+        on=1;
+        edgecount = 0;
+        myled2 = 1; //indicates the temperature is being monitored
+        myled3 = 0;
+        FILE *fp = fopen("/sd/temperat.csv", "a"); //comment this out if using the OLED
+
+        timeout.attach(&attimeout, 5); //sets the amount of time used to calcuate the frequency of the temp sensor
+        while(on){
+            sense.rise(&edge); //tracks the rising edge of the temp sensor
+        }
+        
+        freq = (float)(edgecount)/5;  //calculates the frequency.  Change the divisior if changing the timeout.attach()
+//        oled.locate(0,1); //*** make sure this is not commented out if using the OLED
+//        oled.printf("%4.3f", freq); //*** make sure this is not commented out if using the OLED
+        temp = freq;
+        temp = 1/temp; //changes frequency into period
+        temp = temp*100000; //provides appropriate modifier if J26 is set to GND, GND.
+        temp = temp-273.15;  //calculates the temperature in degrees C
+//        oled.locate(0,3); //*** make sure this is not commented out if using the OLED
+//        oled.printf("%2.3f", temp); //*** make sure this is not commented out if using the OLED
+        tempf = 9*temp;
+        tempf = tempf/5;
+        tempf = tempf + 32; //calcualtes the temperature in degrees F
+//        oled.locate(0,4); //*** make sure this is not commented out if using the OLED
+//        oled.printf("%2.3f", tempf); //*** make sure this is not commented out if using the OLED
+        seconds = timer.read(); //Reads the elaped time
+        fprintf(fp, "%d, ", seconds); //Comment this out if using the OLED
+        fprintf(fp,"%4.3f, %2.3f, %2.3f\n", freq, temp, tempf); //Comment this out if using the OLED
+        fclose(fp); //Comment this out if using the OLED
+        myled2 = 0; //indicates temperature monitoring is over
+        myled3 = 1; //indicates safe to remove power or SD card
+        wait(1); //wait time to allow for safe card removal or powerdown.  Can be commented out if using OLED.
+    }
+}