Ty Kingsmore / Mbed 2 deprecated EATemperature

Temperature Data Logger or Display. Program uses the EA LPCXpresso Board's on-board temp sensor and SD card to constantly monitor the temperature. Optionally, the temp can be displayed on the EA OLED display.

Dependencies:   mbed SDFileSystem

main.cpp@1:37f2341e763b, 2010-06-16 (annotated)

Committer:
tyger23
Date:
Wed Jun 16 16:08:29 2010 +0000
Revision:
1:37f2341e763b
Parent:
0:e05fd3c9c4b3 

        

        
Who changed what in which revision?

        

            
                
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// Program monitors the temperature recorded on the EA LPCXpresso board's U7





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// There is an option to either display the temperature on the OLED or write to an SD card





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// If writing to an SD card, be sure to only unplug the MBED or remove the SD card when LED3 is illuminated





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// Removing power or the SD card when LED3 is not illuminated will result in a loss of data





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// Temperature is monitored every 6 seconds in the current code





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#include "mbed.h"





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#include "EAOLED.h"





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#include "SDFileSystem.h"





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SDFileSystem sd(p5, p6, p7, p24, "sd"); //Used for file system writes to the EA SD card.  Comment this out if displaying on OLED. Make sure J55 pins 1&2 (A) are disconnected!





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DigitalOut myled1(LED1);





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DigitalOut myled2(LED2);





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DigitalOut myled3(LED3);





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//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***





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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***





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Timeout timeout; //timeout used for calculation of frequency





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int edgecount, on, et;





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float temp, freq, tempf;





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void edge(){





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    edgecount = edgecount++;





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}





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void attimeout(){





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    on = 0;





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}





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int main() {





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//    oled.cls(); //*** make sure this is not commented out if using the OLED





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//    oled.locate(0,0); //*** make sure this is not commented out if using the OLED





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//    oled.printf("Frequency:"); //*** make sure this is not commented out if using the OLED





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//    oled.locate(0,2); //*** make sure this is not commented out if using the OLED





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//    oled.printf("Temperature:"); //*** make sure this is not commented out if using the OLED





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    myled1 = 1; //indicates the program is running





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    FILE *fp = fopen("/sd/temperat.csv", "w"); //formats the file header. Comment this out if using the OLED.





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    fprintf(fp,"Time, Freq, TempC, TempF\n"); //Comment this out if using the OLED





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    fclose(fp); //Comment this out if using the OLED





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    et = 0; //Sets elapsed time to 0.  Can comment this out if using OLED.





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    while(1){





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        myled2 = 0; //indicates temperature is not being monitored.  Can be commented out if using OLED.





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        myled3 = 1; //indicates safe to remove power or SD card.  Can be commented out if using OLED.





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        wait(1); //wait time to allow for safe card removal or powerdown.  Can be commented out if using OLED.





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        myled2 = 1; //indicates the temperature is being monitored.  Can be commented out if using OLED.





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        myled3 = 0; //indicates not safe to remove SD card or power.  Can be commented out if using OLED.





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        FILE *fp = fopen("/sd/temperat.csv", "a"); //comment this out if using the OLED





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        on=1;





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        edgecount = 0;





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        timeout.attach(&attimeout, 5); //sets the amount of time used to calcuate the frequency of the temp sensor





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        while(on){





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            sense.rise(&edge); //tracks the rising edge of the temp sensor





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        }





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        freq = (float)(edgecount)/5;  //calculates the frequency.  Change the divisior if changing the timeout.attach()





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//        oled.locate(0,1); //*** make sure this is not commented out if using the OLED





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//        oled.printf("%4.3f", freq); //*** make sure this is not commented out if using the OLED





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        temp = freq;





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        temp = 1/temp; //changes frequency into period





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        temp = temp*100000; //provides appropriate modifier if J26 is set to GND, GND.





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        temp = temp-273.15;  //calculates the temperature in degrees C





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//        oled.locate(0,3); //*** make sure this is not commented out if using the OLED





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//        oled.printf("%2.3f", temp); //*** make sure this is not commented out if using the OLED





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        tempf = 9*temp;





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        tempf = tempf/5;





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        tempf = tempf + 32; //calcualtes the temperature in degrees F





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//        oled.locate(0,4); //*** make sure this is not commented out if using the OLED





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//        oled.printf("%2.3f", tempf); //*** make sure this is not commented out if using the OLED





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        et = et+6; //Calculates the elaped time in seconds. If changing the timeout or the wait time for SD safe removal, you must change this accordingly. Comment this out if using the OLED





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        fprintf(fp,"%d, %4.3f, %2.3f, %2.3f\n", et, freq, temp, tempf); //Comment this out if using the OLED





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        fclose(fp); //Comment this out if using the OLED





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    }





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}