Doug Wendelboe / Mbed 2 deprecated AnalogReadStore

ANALOG READ AND STORE IN FILE Simple example program to read 100 analog samples at half second intervals and store them in a local file.

Dependencies:   mbed

main.cpp@0:11245efb9ab9, 2010-07-14 (annotated)

Committer:
YouTahDoug
Date:
Wed Jul 14 15:55:12 2010 +0000
Revision:
0:11245efb9ab9

        

        
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//-----------------------------------------------------------------------------





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// EXAMPLE: ANALOG READ AND STORE IN FILE





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// Simple example program to read 100 analog samples at half second intervals.





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// The program stores all 100 values and marks each sample as either





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// "above" or "below" the chosen threshold of 0.6. The values are





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// stored in text file analog.txt in the MBED folder. The samples are





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// also written out to stdout (TeraTerm).





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// LED 1 turns ON when the sample goes above 0.6, and OFF when it





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// falls below 0.6. LED2 toggles ON/OFF to show program activity.





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//





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// D. Wendelboe  14 July 2010  - Submitted "as is". No guarantees implied.





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//-----------------------------------------------------------------------------





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#include "mbed.h"





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#define ON   1





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#define OFF  0





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LocalFileSystem local("local");





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AnalogIn myinput(p20);





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DigitalOut myled(p5);





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DigitalOut led1(LED1);





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DigitalOut led2(LED2);





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float analog_value;





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int count = 0;





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int main() {





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    printf("Read and store 100 analog sample at 0.5 sec interval\r\n");





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    FILE *fp = fopen("/local/analog.txt","w");  // Open a file to save samples





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    printf("File analog.txt is open.\r\n");





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    while (count < 100) {





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        analog_value = myinput.read();  // Read analog (range 0.0 to 1.0)





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        if (analog_value > 0.6)         // If value is above 0.6, then store





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        {                               // it as an "above" value.





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            fprintf (fp, "%3i: %f [above]\r\n", count+1, analog_value);





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            led1 = ON;     // Turn LED ON if sample was stored.





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        } else {           // Below 0.6, store it as a "below" value.





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            fprintf (fp, "%3i: %f [below]\r\n", count+1, analog_value);





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            led1 = OFF;    // Turn OFF if sample was not stored.





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        }





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        printf ("%3i: %f\r\n", count+1, analog_value);





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        count++;           // Increment sample counter.





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        led2 = ON;         // LED2 ON.





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        wait_ms(250);      // Wait 0.25 second





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        led2 = OFF;        // LED2 OFF.





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        wait_ms(250);      // Wait 0.25 second





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    }





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    fclose(fp);            // Close the sampe file after 100 samples read.





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    printf("File analog.txt closed.\r\n");





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    printf("Finished. 100 samples taken. Bye!\r\n");





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}