Diff: main.cpp

Revision:

0:d9970d37dd77

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Apr 28 17:58:19 2014 +0000
@@ -0,0 +1,165 @@
+#include "mbed.h"
+#include "rtos.h"
+AnalogIn light_1(p20); //light sensor
+AnalogIn proxi_2(p15); // for detecting motion within the house
+DigitalIn proxi_1(p5); // for security
+DigitalOut relay_1(p8);// power switch tail for controlling the lamp
+DigitalOut relay_2(p22);// power switch tail for controlling the fan
+DigitalIn P11(p11); // Digital inputs p10,p11,p12,p13,p14,p16,p17 for communication between two mbeds; p18 and p19 for handshake signals;
+DigitalIn P12(p12);
+DigitalIn P13(p13);
+DigitalIn P14(p14);
+DigitalIn P10(p10);
+DigitalIn P16(p16);
+DigitalIn P17(p17);
+DigitalOut P18(p18);
+DigitalIn P19(p19);
+DigitalOut myled(LED1);
+DigitalOut led2(LED2); // device 2
+DigitalOut led3(LED3); //device 3
+DigitalOut led4(LED4); //device 4
+Serial pc(USBTX,USBRX);
+float light_thresh=0.4; // set threshold value for light sensor
+float ir_value=0.4; // set threshold value for IR sensor to detect the presence inside the house
+int P111;
+    int P112;
+    int P113;
+    int P114;
+    int P115;
+    int P116;
+    int P117;
+    Mutex bulb; //for locking and unlocking the lamp
+    Mutex pc_lock; //for virtual COM port
+        
+    
+void security_thread(void const *args) // thread for detecting presence near the house
+{
+    while(true)
+    {
+   
+    wait(2);
+    if(P116==1) // check if security feature is enabled or not
+            {
+                if(proxi_1==0) // check the status of proximity sensor
+                {
+                    bulb.lock();
+                    led2=1;      //switch on device 2
+                    relay_2=1;   //switch on the fan
+                    bulb.unlock();
+                    wait(3);
+                    led2=0;       //switch off device 2
+                    relay_2=0;     //switch off the fan
+                    wait(3);
+                   
+                   
+                    
+                    }
+                    
+                    
+                }
+           
+        
+   } 
+    
+    
+    }
+
+int main() {
+  
+    P19.mode(PullUp);
+     proxi_1.mode(PullUp);
+     
+    P18=1;     // Initialize the hand shake signal
+    P116=0;     // Make sure the security feature is turned off by default
+    Thread security(security_thread);
+    
+    while(1) {
+        
+       label: while(P19==1)   // wait till the mbed receives data from the master mbed
+        {
+            
+            }
+            
+        if(P19==0)        //make sure if the read signal is a correct one by waiting for one second and checking again
+        {       wait(1);
+        if(P19!=0)
+          goto label;
+        }
+        //store the status of the digital input pins 
+        P111=(int)P11; // D1
+        P112=(int)P12; // D2 
+        P113=(int)P13; // D3 
+        P114=(int)P14; // D4
+        P115=(int)P10; // manual=0;automatic=1
+        P116=(int)P16; //security on=1, off=0
+        P117=(int)P17; //near=0, far=1
+
+        pc_lock.lock();
+        pc.printf("\n P11: %d, P12: %d, P13: %d, P14:%d, P15:%d, P16:%d, P17:%d\n Proxi_2 %f\n ",P111,P112,P113,P114,P115,P116,P117,(float)proxi_2);
+               
+        pc_lock.unlock();
+        P18=0; //Indicate the reception of data by pulling p18 low
+ 
+    // blink LED1 to indicate that data has been received
+        myled = 1;
+        wait(2);
+        myled = 0;
+        wait(2);
+        P18=1;
+       
+        
+        if((float)proxi_2<ir_value) // check presence inside house
+        
+        {
+       
+            if(P115==1) // check if automatic mode is turned on
+            {
+                if(P117==0) //check if the user is near the home location
+                {
+                    if((float)light_1<light_thresh) //check  value of light sensor, turn on light if it is less than the threshold
+                    relay_1=1; 
+                    else relay_1=0;                 //turn off light if there is enough ambient light 
+                    pc.printf("Light sensor: %f \n",(float)light_1);
+                    bulb.lock();
+                    led2=1;            //turn on device2
+                    relay_2=1;                 //turn on the fan
+                    bulb.unlock();
+                    led3=1;             //turn on device 3
+                   led4=1;              //turn on device 4
+                    
+                    
+                    }
+                else                    //user is far away from home loation; turn off all devices 
+                {
+                    relay_1=0; 
+                    bulb.lock();
+                    led2=0;
+                      relay_2=0;
+                    bulb.unlock();
+                    led3=0;
+                   led4=0;
+                    
+                    
+                    
+                    }
+                
+                
+                
+                
+                }
+            else                //if the system is in manual mode
+            {
+                  relay_1=P111;     // read status of the lamp
+                    bulb.lock();
+                    led2=P112;             // read status of the device-2
+                      relay_2=P112;       //read status of the fan
+                    bulb.unlock();
+                    led3=P113;           // read status of the device-3
+                   led4=P114;            // read status of the device-4
+                    
+                    
+                    }
+        
+    }
+}
+}