Diff: main.cpp

Revision:

0:785d351db1ad

Child:

1:0d467ac74808

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Apr 29 06:50:11 2014 +0000
@@ -0,0 +1,143 @@
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include "NTPClient.h"
+#include "C12832_lcd.h"
+#include "LM75B.h"
+#include "MMA7660.h"
+
+#define PST_OFFSET  7*60*60
+
+Ticker timer;
+C12832_LCD lcd; //Graphics LCD
+EthernetInterface eth; //Networking functions
+NTPClient ntp; //NTP client
+LM75B tmp(p28,p27);
+float setTemp = 74;
+float temp;
+int heaterOn = 0;
+DigitalIn leftButton(p13);
+DigitalIn rightButton(p16);
+#define DEBOUNCE_DELAY 3
+#define LOOP_DELAY_MS 100
+#define TEMP_HYSTERESIS 2
+//update time every 10 minutes
+#define UPDATE_TIME 60*1 
+int pressed = 0;
+int debounceCount = 0;
+float avgTemp = 0;
+MMA7660 MMA(p28, p27);
+int updateTimeFromServer = 1;
+
+void debouncedButtonCheck() {
+    if (leftButton || rightButton || pressed) {
+        if (leftButton && !pressed) {setTemp -= 2;}
+        if (rightButton && !pressed) {setTemp += 2;}
+        pressed = 1;
+        debounceCount++;
+        if (debounceCount >= DEBOUNCE_DELAY) {
+            debounceCount = 0;
+            pressed = 0;
+            printf("New set temp: %.0f\n\r", setTemp);
+            lcd.locate(0,0);
+            lcd.printf("\n\rTemp: %.0f F Set: %.0f\n\r", avgTemp, setTemp);
+        }
+    }
+}    
+void connectToTheInternet() {
+    eth.init(); //Init and use DHCP
+    wait(2);
+    lcd.cls();
+    lcd.printf("Getting IP Address\r\n");
+    printf("Getting IP Address\r\n");
+    if(eth.connect(60000)!=0) {
+        lcd.printf("DHCP error - No IP");
+        wait(10);
+    } else {
+        lcd.printf("IP is %s\n", eth.getIPAddress());
+        printf("IP is %s\n", eth.getIPAddress());
+        wait(2);
+    }
+    lcd.cls();
+}
+
+void updateTime() {
+    updateTimeFromServer = 1;
+}
+
+int main()
+{   
+    connectToTheInternet();    
+    //Variable to hold the current minute so we only update the display when the minute changes
+    char currentMinute[2];
+    currentMinute[1] = 'a';
+    char minute[2];
+    //float zaxis = MMA.z();
+    
+    float currentTemp = -200;
+    lcd.printf("Updating time...\r\n");   
+    printf("Updating time...\r\n");   
+    if (ntp.setTime("0.pool.ntp.org") == 0) {
+        time_t ctTime;
+        lcd.printf("Set time successfully\r\n");
+        printf("Set time successfully\r\n");       
+        lcd.cls();
+        timer.attach(&updateTime, UPDATE_TIME);
+        lcd.printf("\n\r\n\rHEATER OFF");
+        while(1) {      
+        
+            if(updateTimeFromServer) {
+                if (ntp.setTime("0.pool.ntp.org") == 0) {
+                    printf("Time updated!");
+                } else {
+                    lcd.locate(0,0);
+                    printf("Time update failed \n\r");
+                    lcd.printf("Time update failed");
+                }
+                updateTimeFromServer = 0;    
+            }      
+            //Checks button and sets setTemp accordingly
+            debouncedButtonCheck();            
+            //Fetch the time 
+            ctTime = time(NULL)- PST_OFFSET;
+            char timeBuffer[32];  
+                     
+            //See if the minute has changed; set an update display flag if it has
+            strftime(minute, 8, "%M", localtime(&ctTime));           
+            if ( (minute[1] != currentMinute[1]) ) {         
+                //Formats the time for display
+                strftime(timeBuffer, 32, "%a %b %d %I:%M%p\n\r", localtime(&ctTime));           
+                printf("%s\r", timeBuffer);
+                lcd.locate(0,0);
+                lcd.printf("%s\r", timeBuffer);
+                currentMinute[1] = minute[1];
+            }          
+            //Update the temperature display if the temperature, set temp has changed
+            temp = tmp.read()*9.0/5.0 + 32.0;  
+            //checks if the temperature (rounded to the nearest whole number) has changed 
+            if (floor(temp+.5) != floor(currentTemp+.5)) {
+                printf("Temp: %.1f F Set: %.0f\n\r", temp, setTemp);
+                currentTemp = temp;
+                avgTemp = (temp+currentTemp)/2.0;
+                lcd.locate(0,0);
+                lcd.printf("\n\rTemp: %.0f F Set: %.0f\n\r", avgTemp, setTemp);
+            }    
+            lcd.locate(0,0);             
+            //Heater logic: turns off if it has gone 2 degrees over the set temp, or on if it's 2 degrees under
+            if (heaterOn && (temp > (setTemp + TEMP_HYSTERESIS)) ) {
+                printf("Heater turned OFF\n\r");
+                heaterOn = 0; 
+                lcd.locate(0,0);
+                lcd.printf("\n\r\n\rHEATER OFF");
+            } else if (!heaterOn && (temp < (setTemp - TEMP_HYSTERESIS)) ) {
+                printf("Heater turned ON\n\r");
+                heaterOn = 1;
+                lcd.locate(0,0);
+                lcd.printf("\n\r\n\rHEATER ON");
+            }      
+            wait(LOOP_DELAY_MS*.001);                                
+        }
+    } else {
+        lcd.printf("NTP Error\r\n");
+    }
+    eth.disconnect();
+}
\ No newline at end of file