David Sanchez / Mbed 2 deprecated 4180project

hi

Dependencies:   4DGL-uLCD-SE Servo HC_SR04_Ultrasonic_Library mbed-rtos mbed

Created by David Sanchez, Jonathan Arthur, and Jong Pil Park

Smart Door Lock

Overview

The smart door lock system was designed with the purpose of adding a modular form of security and convenience to any door. A servo was connected to a door lock which locks and unlocks the door through three different methods: Using an app on a phone via Bluetooth , the use of pushbuttons, and a set of timers which lock the door after a certain time. Sonar was also implemented to determine whether the door is in an opened or closed state. An LCD was used to display the current state of the locking mechanism. Lastly, a speaker and an amplifier are included which are used as an alarm that goes off when the door is opened without authorization.

Bluetooth Thread

/media/uploads/Philipjp/ble.jpg

Adafruit BLEMbed
VinVu
gnd,CTSGnd
TXOp10
RXIp9

To be able to wirelessly unlock the door knob we used the adafruit BLE which can communicate with the Bluefruit app. We created a function which prints a line to the phone asking for a password. It waits until something is typed in and if the password is correct it unlocks/locks the door. If the password is not correct it just prints the same line again. This function runs on a separate thread so that other things can be done simultaneously.

void bluetooth(){
      
      while(1){

       blue.printf("enter password\n");   
             if (blue.getc()=='!')
              {
              if (blue.getc()=='!')
              {
               if (blue.getc()=='!')
              {
               if (blue.getc()=='!')
               {
                      i=!i;   
                     blue.printf("password is correct\n");  
               }
               }
               }
               }          
                                  }//end while loop
    }

LCD Thread

/media/uploads/Philipjp/8185.png

uLCD cableMbed
Vcc5V
GndGnd
TXp13
RXp14
RESETp15

Another thread was used for displaying the status of the door. If the door is closed a red message is displayed on the LCD and a green message is displayed if the door is opened. The LCD also tells if the door is locked or unlocked. The code for the LCD is provided below. This thread uses a mutex so that the program does not lock up.

void LCD()
{
    while(1)
    {
       mut.lock();
       if(i==0){
             
             uLCD.locate(7,9);
             uLCD.printf("Locked       ");
             }
             else 
             {
                 uLCD.locate(7,9);
             uLCD.printf("Unlocked");
             
     }
       mut.unlock();
       
       
       
       
       if (j==0)
       {
           mut.lock();
         
           uLCD.line(0, 0, 127, 0, RED);
            uLCD.line(127, 0, 127, 127, RED);
            uLCD.line(127, 127, 0, 127, RED);
             uLCD.line(0, 127, 0, 0, RED);
           uLCD.color(RED);
           uLCD.locate(7,8);
            uLCD.text_width(1);
           uLCD.text_height(1);
           uLCD.printf("CLOSED   ");
           mut.unlock();
       }//end if
       
       if(j==1)
        {
        
            mut.lock();
          
            uLCD.line(0, 0, 127, 0, GREEN);
            uLCD.line(127, 0, 127, 127, GREEN);
            uLCD.line(127, 127, 0, 127, GREEN);
             uLCD.line(0, 127, 0, 0, GREEN);
           uLCD.color(GREEN);
           uLCD.locate(7,8);
           uLCD.text_width(1);
           uLCD.text_height(1);
           uLCD.printf("OPEN    ");
          
         
            mut.unlock();
        }  
           
           
        Thread::wait(2);
                 
    }//end while
}//end LCD

Light Sensor Thread

/media/uploads/davidscque/lightsen.png

A light sensor is used to tell if it is night time. This thread checks if the amount of light is low and if it is it locks the door after 10 minutes.

void LEDT(){
     while(1){
           
           
           
            
              mut.lock(); 
              if(photocell<0.010)
              {
               mut.unlock(); 
               Thread::wait(100000);
               Thread::wait(100000);
               Thread::wait(100000);
                 mut.lock(); 
               if(photocell<0.010)
               i=0;
               } //end if
               
               
                 mut.unlock(); 
                 
                 
               //Thread::yield();  
                 
            }//end while
              

         
         }

Speaker Thread

/media/uploads/Philipjp/speaker.jpg /media/uploads/davidscque/amp.jpg

MbedTPA2005D1Speaker
gndpwr-,in-
Voutpwr+
p18in+
out++
out--

This thread checks if the door is opened while it is locked and makes the alarm go off.

void Pwspeaker()
    {
        
        while(1)
        {
            
         while(i==0&&j==1)
         {
           speaker.PlayNote(969.0, 0.5, 1.0);
        speaker.PlayNote(800.0, 0.5, 1.0);

          }   
            
            
            
        }
            
    }

Main Thread

/media/uploads/Philipjp/servoproduct.jpg.200x200_q85.jpg /media/uploads/Philipjp/servocable.png

Servo MotorMbed
BlackGnd
RED5V
Yellowp21

/media/uploads/Philipjp/hcsr04.jpg

Sonar SenorMbed
Vcc5V
GndGnd
trigp6
echop7

/media/uploads/Philipjp/bottom.jpg

Pb1Pb2Pb3Mbed
pin1p19
pin1p 23
pin1p24
pin2pin2pin2gnd

/media/uploads/Philipjp/rgbled.jpg

RGBLED lightMbed
REDp26
GndGnd
GREENp29
BLUEp30

The main thread initializes all the other threads, checks if the pushbuttons are pressed and checks if the door is closed or open. The pushbuttons simply unlock and lock the door. There is a third pushbutton that locks the door but 10 seconds after being pressed. This gives the person time to open and close the door before it locks. Sonar is used to check if the door is closed or open. The main thread initializes the sonar so that the distance from the sensor to an object is constantly measured. If this distance is greater than a certain value then it means that the door is open. This is used for the alarm which is turned on if the door is open while it is locked. An RGB LED used to indicate the status of the door. If the door is locked the green LED turns on and if the door is unlocked the red LED turns on. The blue LED turns on when the door is open.

int main() {    
uLCD.baudrate(3000000);
 pb1.mode(PullUp);
  pb2.mode(PullUp);
  pb3.mode(PullUp);
   mu.startUpdates();//start measuring the distance

thread3.start(Pwspeaker);       
         thread.start(bluetooth);
  thread2.start(LCD);
  thread4.start(LEDT);
 
   while(1){
       
       
        LEDG =!i;
        LEDB = 0;
        LEDR= i;   
            
    if(pb3==0){
     
     mut.lock();
     uLCD.cls();
     uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
     uLCD.printf("10");
     
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("9");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("8");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("7");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("6");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("5");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("4");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("3");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("2");
          wait(1);
          uLCD.cls();
           uLCD.color(RED);
     uLCD.locate(3,3);
     uLCD.text_width(3);
     uLCD.text_height(3);
          uLCD.printf("1");
          wait(1);
          uLCD.cls();
           
     i=0;
     mut.unlock();
    
     } 
     
     
        
        
        
            
   if (pb1==0){//Locked
        
        i = 0;
      
        }
       
    if (pb2==0){//Unlocked
        i = 1;
        
        }
         if (j==1){//close
            LEDR =0;
           LEDG = 0;
           LEDB =1;
        }
       
  
 
   
        myservo=i;
      
      mut.lock();
        mu.checkDistance();
        mut.unlock();
        printf("%f \n",dist2);
        if (dist2>0.5f)
        {
            led=1;
            j=1;
           
        }
        else 
        {
            led=0;
            j=0;
           
            }
                
            
    }//end while
}//end main

ultrasonic.h@1:21d56f84fe51, 2018-05-01 (annotated)

Committer:
davidscque
Date:
Tue May 01 04:54:34 2018 +0000
Revision:
1:21d56f84fe51
final edit;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davidscque 1:21d56f84fe51 1 #ifndef MBED_ULTRASONIC_H
davidscque 1:21d56f84fe51 2 #define MBED_ULTRASONIC_H
davidscque 1:21d56f84fe51 3
davidscque 1:21d56f84fe51 4 #include "mbed.h"
davidscque 1:21d56f84fe51 5
davidscque 1:21d56f84fe51 6 class ultrasonic
davidscque 1:21d56f84fe51 7 {
davidscque 1:21d56f84fe51 8 public:
davidscque 1:21d56f84fe51 9 /**iniates the class with the specified trigger pin, echo pin, update speed and timeout**/
davidscque 1:21d56f84fe51 10 ultrasonic(PinName trigPin, PinName echoPin, float updateSpeed, float timeout);
davidscque 1:21d56f84fe51 11 /**iniates the class with the specified trigger pin, echo pin, update speed, timeout and method to call when the distance changes**/
davidscque 1:21d56f84fe51 12 ultrasonic(PinName trigPin, PinName echoPin, float updateSpeed, float timeout, void onUpdate(int));
davidscque 1:21d56f84fe51 13 /** returns the last measured distance**/
davidscque 1:21d56f84fe51 14 int getCurrentDistance(void);
davidscque 1:21d56f84fe51 15 /**pauses measuring the distance**/
davidscque 1:21d56f84fe51 16 void pauseUpdates(void);
davidscque 1:21d56f84fe51 17 /**starts mesuring the distance**/
davidscque 1:21d56f84fe51 18 void startUpdates(void);
davidscque 1:21d56f84fe51 19 /**attachs the method to be called when the distances changes**/
davidscque 1:21d56f84fe51 20 void attachOnUpdate(void method(int));
davidscque 1:21d56f84fe51 21 /**changes the speed at which updates are made**/
davidscque 1:21d56f84fe51 22 void changeUpdateSpeed(float updateSpeed);
davidscque 1:21d56f84fe51 23 /**gets whether the distance has been changed since the last call of isUpdated() or checkDistance()**/
davidscque 1:21d56f84fe51 24 int isUpdated(void);
davidscque 1:21d56f84fe51 25 /**gets the speed at which updates are made**/
davidscque 1:21d56f84fe51 26 float getUpdateSpeed(void);
davidscque 1:21d56f84fe51 27 /**call this as often as possible in your code, eg. at the end of a while(1) loop,
davidscque 1:21d56f84fe51 28 and it will check whether the method you have attached needs to be called**/
davidscque 1:21d56f84fe51 29 void checkDistance(void);
davidscque 1:21d56f84fe51 30 private:
davidscque 1:21d56f84fe51 31 DigitalOut _trig;
davidscque 1:21d56f84fe51 32 InterruptIn _echo;
davidscque 1:21d56f84fe51 33 Timer _t;
davidscque 1:21d56f84fe51 34 Timeout _tout;
davidscque 1:21d56f84fe51 35 int _distance;
davidscque 1:21d56f84fe51 36 float _updateSpeed;
davidscque 1:21d56f84fe51 37 int start;
davidscque 1:21d56f84fe51 38 int end;
davidscque 1:21d56f84fe51 39 volatile int done;
davidscque 1:21d56f84fe51 40 void (*_onUpdateMethod)(int);
davidscque 1:21d56f84fe51 41 void _startT(void);
davidscque 1:21d56f84fe51 42 void _updateDist(void);
davidscque 1:21d56f84fe51 43 void _startTrig(void);
davidscque 1:21d56f84fe51 44 float _timeout;
davidscque 1:21d56f84fe51 45 int d;
davidscque 1:21d56f84fe51 46 };
davidscque 1:21d56f84fe51 47 #endif