Diff: main.cpp

Revision:

0:40afd0d80b51

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue May 20 06:18:16 2014 +0000
@@ -0,0 +1,245 @@
+/*******************************************************/
+/*              IMPLEMENT THE THERMOSTAT               */
+/*System turned ON/OFF using joystick or Accelerometer */
+/*Temperature Set using Joystick                       */
+/*System Status and heater state shown on LED          */
+/*LCD displays: Time.                                  */
+/*              If system is ON current and set low    */
+/*                 and High Temperature                */
+/*              Heater/Cooler ON                       */
+/*              If system is OFF SYSTEM OFF            */
+/*The timing, current temperature, accelerometer reading*/
+/*are sent periodically to websockets.org/bhakti       */
+/*The duration after which the information is sent is  */
+/*defined by macro SECONDS which is currently set to 10*/
+/*******************************************************/
+
+#include "mbed.h"
+#include "C12832_lcd.h"
+#include "LM75B.h"
+#include "DebouncedIn.h"
+#include "MMA7660.h"
+#include "EthernetInterface.h"
+#include "NTPClient.h"
+#include "SimpleSMTPClient.h"
+#include "Small_6.h"
+#include "Websocket.h"
+
+#define hys 3
+#define HEATER 0
+#define COOLER 1
+#define No_HEAT_COOL 2
+#define SEND 1
+#define DO_NOT_SEND 0
+#define SECONDS 10
+
+DebouncedIn reset(p14);
+C12832_LCD lcd;
+LM75B current(p28,p27);
+MMA7660 MMA(p28, p27);
+Serial pc(USBTX,USBRX);
+AnalogIn max_temp(p19);
+AnalogIn min_temp(p20);
+
+//System ON/OFF
+BusIn heat_on (p16,p13); 
+                                      
+//System ON/OFF LED
+DigitalOut thermostat (LED1);
+
+//Heater/Cooler ON/OFF LED. This can be furthur connected to the relay                                  
+DigitalOut heater (LED2);  
+DigitalOut cooler (LED3);
+
+Ticker check_move;                                    
+Ticker Send_info;
+
+bool no_move;             //This variable is set if no movement is detected
+float acc_x = MMA.x();
+float acc_y = MMA.y();
+float acc_z = MMA.z();
+float acc_x_old,acc_y_old,acc_z_old;
+int heat_cool;     //1: Heater ON , 0:Cooler ON , 2: Heater and Cooler OFF
+bool send_info;    //This variable is used to define when the information is
+                   //to be sent to the web.
+
+/****************************************************************************/
+/*Function name: check: This function is used to detect motion around the   */
+/*thermostat.It sets the variable no move if the previous and current       */
+/*value of the accelerometer value is same. Accelerometer value unchanged   */
+/*indicates that there is no motion around the thermostat                   */
+/****************************************************************************/
+void check()
+{
+    acc_x_old = acc_x;
+    acc_y_old = acc_y;
+    acc_z_old = acc_z;
+    acc_x = MMA.x();
+    acc_y = MMA.y();
+    acc_z = MMA.z();
+    if (acc_x_old == acc_x && acc_y_old == acc_y && acc_z_old == acc_z)
+    {
+        no_move = 1;
+    }
+    else
+        no_move = 0;
+    
+}
+/******************************************************************************/
+
+/******************************************************************************/
+/*Function name: send_ws()                                                    */
+/*This function is used to set a boolean variable to SEND so that the         */
+/*information can be sent over the web. The variable is set to SEND after no. */
+/*of seconds defined by SECONDS(currently 10sec)                              */
+/******************************************************************************/
+void send_ws()
+{
+    send_info = SEND;
+}
+
+/*******************************************************************************/
+
+int main()
+{
+    int ret_msg,ret_msg2,ret_curr_time,eth_ret,ws_ret;
+    EthernetInterface eth;
+    lcd.cls();
+    pc.printf("\n\n/* SimpleMTPClient library demonstration \n");
+
+    pc.printf("Setting up ...\n");
+    eth.init();
+    eth_ret = eth.connect();
+    if (eth_ret != 0)
+    {
+        lcd.cls();
+        lcd.printf("Ethernet not connected");
+        return -1;
+    }
+    pc.printf("Connected OK\n");
+
+    // IP Address 
+    pc.printf("IP Address is %s\n", eth.getIPAddress());
+    lcd.locate(0,1);
+    lcd.printf("%s", eth.getIPAddress());
+    wait(2);
+   
+    
+    NTPClient ntp;
+    ntp.setTime("time.nist.gov");                                     
+    lcd.cls(); 
+    
+    Websocket ws("ws://sockets.mbed.org:443/ws/bhakti/rw");
+    ws_ret = ws.connect();
+    if (!ws_ret)
+    {
+        lcd.cls();
+        lcd.printf("Nor connected to URL");
+        return -1;
+    }
+    
+        /*Messages to be sent over the web*/
+    char msg[100];
+    char msg2[100];
+    char curr_time[100];
+                                                  
+    float min_set;
+    float max_set; 
+    
+    //This variable is used to check if the system is ON or OFF                                            
+    bool status=0;
+        
+    time_t ctTime;                         
+    lcd.cls();                 
+    check_move.attach(&check,120.0);
+    Send_info.attach(&send_ws,SECONDS);
+    while (1) {
+        sprintf(msg,"Temperature is %0.2f",current.read());
+        sprintf(msg2,"Accelerometer readings are X= %0.2f,Y= %0.2f, Z= %0.2f",MMA.x(),MMA.y(),MMA.z());
+              sprintf(curr_time,"Time: %s",ctime(&ctTime));
+        if (send_info == SEND) {
+            ret_msg2 = ws.send(msg2);
+            ret_msg = ws.send(msg);
+            ret_curr_time=ws.send(curr_time);
+            if (ret_msg == -1 || ret_msg2 == -1 || ret_curr_time == -1)
+            {
+                lcd.cls();
+                lcd.printf("One of the messages not sent");
+            }
+            send_info = DO_NOT_SEND;
+        }
+        min_set = min_temp.read() * 50;   //scale the pot value from 0 to 1 -> 0 to 50
+        max_set = max_temp.read() * 50;
+        ctTime = time(NULL) - 25200;      //Adjust time as per local time
+        lcd.set_font((unsigned char*) Small_6);  //set LCD font
+        lcd.locate(1,1);
+        lcd.printf("%s",ctime(&ctTime));                     
+        lcd.locate(1,8);
+          
+        /*If system is ON print current and set temperature*/
+        /*Else print LCD OFF on LCD*/
+                                           
+        if (status) {                                          
+            lcd.printf("Curr:%.2f",current.read());
+            lcd.locate(1,16);
+            lcd.printf("MAX:%0.2f, MIN:%0.2f",max_set,min_set);
+            lcd.locate(1,24);
+            switch (heat_cool) {
+                case HEATER : lcd.printf("Heater ON     ");
+                              break;
+                case COOLER : lcd.printf("Cooler ON     ");
+                              break;
+                case No_HEAT_COOL : lcd.printf("Heat/Cool OFF");
+                              break;
+            }
+            
+        } else {                                               
+            lcd.locate(1,10);
+            lcd.printf("System OFF");
+            wait (0.1);
+        }
+        
+        /*If system is turned ON: Joystick is pushed towards edge of LCD
+          OR movement is detected
+          Turn System ON LED on: LED1 and Set the status variable to 1
+          Else if system is turned OFF by user turn OFF the system status LED
+          and the LED that is connected to the relay*/
+          
+        if (heat_on == 0x2 || !no_move) 
+        {
+            thermostat = 1;                                    
+            status = 1;                                        
+        } else if (heat_on == 0x1 || no_move) {          
+            lcd.cls();                                        
+            thermostat = 0;                                    
+            heater = 0;                                       
+            status = 0;                                       
+        }
+        
+        //Comparison logic and turn Heater/Cooler ON/OFF
+        if ((min_set > (current.read()+ hys)) && thermostat == 1) {
+            heater =  1;
+            cooler = 0;
+            status = 1;
+            heat_cool = HEATER;
+        }
+        else if ((max_set < (current.read()-hys)) && thermostat == 1) {
+            cooler = 1;
+            heater = 0;
+            status = 1;
+            heat_cool = COOLER;    
+        }
+        else if (!thermostat) {
+            heater = 0;
+            cooler = 0;
+            status = 0;
+        }
+        else {
+            heater = 0;
+            cooler = 0;
+            status = 1;
+            heat_cool = No_HEAT_COOL;
+        }
+            
+     }
+}