Diff: main.cpp

Revision:

0:11245efb9ab9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jul 14 15:55:12 2010 +0000
@@ -0,0 +1,55 @@
+//-----------------------------------------------------------------------------
+// EXAMPLE: ANALOG READ AND STORE IN FILE
+// Simple example program to read 100 analog samples at half second intervals.
+// The program stores all 100 values and marks each sample as either
+// "above" or "below" the chosen threshold of 0.6. The values are
+// stored in text file analog.txt in the MBED folder. The samples are
+// also written out to stdout (TeraTerm).
+// LED 1 turns ON when the sample goes above 0.6, and OFF when it
+// falls below 0.6. LED2 toggles ON/OFF to show program activity.
+//
+// D. Wendelboe  14 July 2010  - Submitted "as is". No guarantees implied.
+//-----------------------------------------------------------------------------
+
+#include "mbed.h"
+
+#define ON   1
+#define OFF  0
+
+LocalFileSystem local("local");
+AnalogIn myinput(p20);
+DigitalOut myled(p5);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+
+float analog_value;
+int count = 0;
+
+int main() {
+    printf("Read and store 100 analog sample at 0.5 sec interval\r\n");
+    
+    FILE *fp = fopen("/local/analog.txt","w");  // Open a file to save samples
+    printf("File analog.txt is open.\r\n");
+
+    while (count < 100) {
+        analog_value = myinput.read();  // Read analog (range 0.0 to 1.0)
+        if (analog_value > 0.6)         // If value is above 0.6, then store
+        {                               // it as an "above" value.
+            fprintf (fp, "%3i: %f [above]\r\n", count+1, analog_value);
+            led1 = ON;     // Turn LED ON if sample was stored.
+
+        } else {           // Below 0.6, store it as a "below" value.
+            fprintf (fp, "%3i: %f [below]\r\n", count+1, analog_value);
+            led1 = OFF;    // Turn OFF if sample was not stored.
+        }
+        printf ("%3i: %f\r\n", count+1, analog_value);
+        count++;           // Increment sample counter.
+        led2 = ON;         // LED2 ON.
+        wait_ms(250);      // Wait 0.25 second
+        led2 = OFF;        // LED2 OFF.
+        wait_ms(250);      // Wait 0.25 second
+    }
+    fclose(fp);            // Close the sampe file after 100 samples read.
+    printf("File analog.txt closed.\r\n");
+    printf("Finished. 100 samples taken. Bye!\r\n");
+}