Diff: main.cpp

Revision:

0:5564c47f0add

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Dec 27 20:34:34 2014 +0000
@@ -0,0 +1,67 @@
+#include "mbed.h"
+#include "Pulse.h"
+#include "SDFileSystem.h"
+ 
+//SDFileSystem sd(PTD2, PTD3, PTD1, PTD0, "sd"); // the pinout on the mbed Cool Components workshop board
+SDFileSystem sd(p5, p6, p7, p26, "sd");
+
+AnalogIn sense(p15);
+PulseInOut pulse1(p8);
+DigitalOut output1(LED1);
+Serial pc(USBTX, USBRX);
+
+
+//pc.baud(9600);
+//Serial async_port(PTA2,PTA1);
+
+unsigned long duration;
+unsigned long starttime;
+unsigned long sampletime_ms = 30000;//sampe 30s ;
+unsigned long lowpulseoccupancy = 0;
+float ratio = 0;
+float concentration = 0;
+
+Timer t1; // define timer object
+void task1(void); // task function prototype
+
+int main() 
+ {
+      mkdir("/sd/mydir", 0777);
+ t1.start(); // start timer counting
+ starttime=t1.read_ms();
+  while(1) {
+    duration=pulse1.read_low_us();
+    lowpulseoccupancy = lowpulseoccupancy+duration;
+if ((t1.read_ms()-starttime) > sampletime_ms) // read time in ms
+ {
+     pc.printf("Sensor value: %f \n\r", sense.read());
+     pc.printf("Before Task\n\r");
+     pc.printf("\n Duration=%lu,Low Pulse Occupancy=%lu,starttime=%lu\n\r",duration,lowpulseoccupancy,starttime);
+ task1(); // call task function
+     FILE *fp = fopen("/sd/mydir/sdtest.txt", "a+");
+        if(fp == NULL) {
+        error("Could not open file for write\n");
+    }
+    fprintf(fp, "Sensor value:%f,Low Pulse Occupancy=%lu,Time: %lu",sense.read(),lowpulseoccupancy,starttime);
+    //pc.printf("\n Sensor value:%f",sense.read());
+    fclose(fp); 
+    lowpulseoccupancy = 0;
+
+ }
+ }
+}
+void task1(void)
+{ 
+    ratio = lowpulseoccupancy/(sampletime_ms*10.0);  // Integer percentage 0=>100
+    concentration = 1.1*pow(ratio,3)-3.8*pow(ratio,2)+520*ratio+0.62; // using spec sheet curve
+    pc.printf("After Task\n\r");
+    pc.printf("\n Low pulse occupancy=%lu",lowpulseoccupancy);
+    pc.printf(",");
+    pc.printf("Ratio=%f",ratio);
+    pc.printf(",");
+    pc.printf("Concentration=%f\n\r",concentration);
+    
+    starttime = t1.read_ms();
+    output1=!output1; // toggle output
+    
+}
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