Diff: main.cpp

Revision:

0:1c367d1c3ad3

diff -r 000000000000 -r 1c367d1c3ad3 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Jan 20 22:48:40 2014 +0000
@@ -0,0 +1,48 @@
+#include "mbed.h"
+#include "rtos.h"
+
+#define ON_SECS (10)
+#define OFF_SECS (10)
+#define SAMPLE_RATE_HZ (5)
+
+Serial pc(USBTX, USBRX);
+DigitalOut relay(p21);
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+AnalogIn adc(p20);
+LocalFileSystem local("local");
+
+double get_voltage(double d) { /* calibrated in freezer */
+    return 8.14*d;
+}
+
+void relay_thr(void const *argument) {
+    int i;
+    while(1) {
+        relay = led1 = 1;
+        for(i=0; i<ON_SECS; ++i) Thread::wait(1000);
+        relay = led1 = 0;
+        for(i=0; i<OFF_SECS; ++i) Thread::wait(1000);
+    }
+}
+
+void log_thr(void const *argument) {
+    FILE *fp = fopen("/local/bv.csv", "a");
+    fprintf(fp,"BEGIN\n");
+    fclose(fp);
+    while(1) {
+        led2 = 1;
+        FILE *fp = fopen("/local/bv.csv", "a");
+        fprintf(fp, "%d,%f\n",(int)relay,get_voltage(adc)-5.0);
+        printf("%d,%f\n",(int)relay,get_voltage(adc)-5.0);
+        fclose(fp);
+        led2 = 0;
+        Thread::wait(1000/SAMPLE_RATE_HZ);
+    }
+}
+
+int main() {
+    Thread relay_thread(relay_thr); // toggles relay
+    Thread log_thread(log_thr); // logs batt voltage
+    while(1);
+}