Diff: main.cpp

Revision:

6:a198730290d9

Parent:

5:608f2bf4d3f7

Child:

7:dc30e0495898

--- a/main.cpp	Thu Feb 06 14:05:51 2014 +0000
+++ b/main.cpp	Sat Dec 05 12:59:33 2020 +0000
@@ -1,28 +1,56 @@
-#include "mbed.h"
-#include "LM75B.h"
-#include "C12832.h"
+#include "mbed.h"                                                               // mbed header
+#include "LM75B.h"                                                              // temp sensor header
+#include "C12832.h"                                                             // lcd screen header
 
-C12832 lcd(p5, p7, p6, p8, p11);
+C12832 lcd(p5, p7, p6, p8, p11);                                                // define lcd
+LM75B sensor(p28,p27);                                                          // define tem sensor
+Serial pc(USBTX,USBRX);                                                         // define serial port
+LocalFileSystem local("local");                                                 // create local file system location
 
-LM75B sensor(p28,p27);
-Serial pc(USBTX,USBRX);
+int seconds = 60;                                                               // define timespan variable
+int i=0;                                                                        // define iteration variable
+float accum = 0.0;                                                              // define temporary accumulator float
+int timeDelay = 5;                                                              // define sample time range
 
-int main ()
+
+int main()                                                                      // start main program
 {
 
     //Try to open the LM75B
-    if (sensor.open()) {
-        printf("Device detected!\n");
+    if (sensor.open()) {                                                        // test if temp sensor functioning (quickly eliminated if functional)
+        lcd.printf("Device detected!\n");
+
+        while (1) {                                                             // constant loop
+            lcd.cls();                                                          // clear lcd screen
+            lcd.locate(0,3);                                                    // create lcd home location
+            lcd.printf("Temp = %.3f\n\n\r", (float)sensor);                     // print sensor reading to lcd
+            pc.printf("Temp = %.3f degrees C\n\r", (float)sensor);              // print sensor reading to pc
+
+            float value = (float)sensor;                                        // store sensor reading as usable variable
+            accum = accum + value;                                              // begin accumulating sum of values detected
+            i = i+1;                                                            // iterate iteration variable
 
-        while (1) {
-            lcd.cls();
-            lcd.locate(0,3);
-            lcd.printf("Temp = %.3f\n", (float)sensor);
-            wait(1.0);
+            if (i==(seconds/timeDelay)) {                                                           // define max number of iterations allowed
+                float avgTemp = accum/i                  ;                                          // create an average value for the sensor readings
+                pc.printf("Average Temp for last %d seconds = %.3f degrees C\n\r", avgTemp);        // print text of average temp reading to the pc
+
+                /* attempt to record an average temperature over a defined period to local memory - in this case every minute.
+                FILE*fp = fopen("/local/avgTemp.txt", "a");                     // direct to txt file in local memory
+                fprintf(fp, avgTemp);                                           // attempt to write average temp to local flash (does not work! - looking for string. Putc also doesn't work)
+                fclose(fp);                                                     // close the file
+                */
+                
+                i=0;                                                            // reset the iteration variable to start sequence again
+                accum=0.0;                                                      // reset the temporary accumulator value to start sequence again
+            }
+
+            wait(timeDelay);                                                    // wait for desired time between readings
         }
 
-    } else {
+    } else {                                                                    // if temp sensor not functioning throw an error
         error("Device not detected!\n");
     }
 
+
+
 }