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Electronic Combination lock using PIC 16F877 Mircocontroller

September 10, 2014, 7:18 am
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Clik here to view. Electronic-Combinational-Lock-pic-microcontroller-embedded-circuit-design
Electronic Combination lock PIC Mircocontroller
Electronic locks are extremely useful in protecting our precious possessions and can be installed anywhere with bit of engineering in it. We are widely familiar with the Password based e-locks and might have installed in our house. But we are going for Electronic locks made by any company when you can make one by your own.

This project demonstrates you how to make a PIC microcontroller based simple digital lock and also explains the programming behind it.

WHAT YOU NEED:

  1. PIC 16F877 Microcontroller
  2. 4x3 Keypad - Key Input
  3. 16x2 LCD - Status Indicator
  4. 5V Relay - Activator
Additionally you need a POT which is used to adjust the contrast of the LCD, A transistor to drive the relay since the current obtained from a Pin of Microcontroller is very less. A diode to prevent the reverse flow of current which might damage the controller.  

DESIGN:

The design of the above Embedded Project is pretty straight forward, you need to interface a LCD to PORT B and Keypad to the PORT D of the Controller. If you are not familiar with it then i suggest you to go through this Interfacing LCD and Keypad with PIC Microcontroller. Now lets see how the system is designed to work as a Locker.


  • "*" Key - This key is meant to initialize the system, when the system is turned ON the Controller will scan only this key and pressing this key will enable you to enter the password for your locker.
  • "#" Key - When you are done with your locker , you should press this key which will turn off the system and turning off the relay as well.
The remaining keys are meant to feed the character values to the Microcontroller and in turn the Microcontroller will analyze the characters. Based on the Pre defined password in the Controller it will compare the input with it. Thereby it will recognize the correct or incorrect password input.

CODE:

The below code was built using CCS compiler for the PIC Microcontroller

  1. #include<16F877.h>
  2. #include<stdio.h>
  3. #bit led=0x05.0
  4. #bit TRIS_led=0x85.0
  5. #byte lcd=0x06
  6. #byte TRIS_lcd=0x86
  7. #bit rs=0x07.0
  8. #bit TRIS_rs=0x87.0
  9. #bit en=0x07.1
  10. #bit TRIS_en=0x87.1
  11. #bit relay=0x07.2
  12. #bit TRIS_relay=0x87.2
  13. #bit C1=0x08.0
  14. #bit C2=0x08.1
  15. #bit C3=0x08.2
  16. #bit R1=0x08.3
  17. #bit R2=0x08.4
  18. #bit R3=0x08.5
  19. #bit R4=0x08.6
  20. #bit TRIS_C1=0x88.0
  21. #bit TRIS_C2=0x88.1
  22. #bit TRIS_C3=0x88.2
  23. #bit TRIS_R1=0x88.3
  24. #bit TRIS_R2=0x88.4
  25. #bit TRIS_R3=0x88.5
  26. #bit TRIS_R4=0x88.6
  27. void display(unsigned char a,int b);  //LCD subroutine
  28. char keypad();                               //Keypad Subroutine
  29. void check();                                 //Password check routine
  30. char password[5]={"7196"};         //Predefined password
  31. char pswd[5];
  32. unsigned char open_msg[15]="Enter Password";
  33. unsigned char welcome_msg[8]="Welcome";
  34. unsigned char close_msg[15]="Wrong Password";
  35. char c;
  36. int flag,i,count,j;
  37. void main()
  38. {
  39.    TRIS_lcd=TRIS_en=TRIS_rs=TRIS_led=TRIS_relay=0; //Directions set
  40.    TRIS_R1=TRIS_R2=TRIS_R3=TRIS_R4=count=0;
  41.    TRIS_C1=TRIS_C2=TRIS_C3=1;
  42.     while(TRUE)
  43.     {
  44.      c=keypad();
  45.      {
  46.      if(c=='*')                                    //Initialize condition
  47.      {
  48.      flag=1;                                       //Flag set to scan other keys
  49.      count=0;
  50.      display(0x01,0);
  51.      display(0x38,0);
  52.      display(0x0f,0);
  53.      display(0x80,0);
  54.      for(i=0;i<=13;i++)
  55.      {
  56.      display(open_msg[i],1);
  57.      }
  58.      display(0xc0,0);
  59.      }
  60.      else if(c=='#')                         //Turning off condition
  61.      {
  62.      count=0;
  63.      relay=0;
  64.      display(0x01,0);
  65.      display(0x0c,0);
  66.      }
  67.      else
  68.      {
  69.      display('*',1);
  70.      pswd[count]=c;                   //Storing input in new arrays
  71.      count=count+1; 
  72.      check();                             
  73.      }
  74.      }
  75.    }
  76. }
  77. void display(unsigned char a,int b)
  78.   {
  79.     lcd=a;
  80.     rs=b;
  81.     en=1;
  82.     delay_ms(10);
  83.     en=0;
  84.     delay_ms(10);
  85.   }
  86. char keypad()                       
  87.  {
  88.   if(flag==0)                            //Waiting for Initialization
  89.   {
  90.     while(TRUE)
  91.     {
  92.      R4=1; 
  93.      R1=R2=R3=0;
  94.      if(C1==1)
  95.       {
  96.         while(C1==1);
  97.         count=0;
  98.         return '*';
  99.       }
  100.      if(C3==1)
  101.       {
  102.         while(C3==1);
  103.         count=0;
  104.         return '#';
  105.       }
  106.    }
  107.  }
  108. else if(flag==1)
  109. {
  110. while(TRUE)                      //Keypad scan
  111. {
  112. R1=1;
  113. R2=R3=R4=0;
  114. if(C1==1)
  115. {
  116. while(C1==1);
  117. return '1';
  118. }
  119. if(C2==1)
  120. {
  121. while(C2==1);
  122. return '2';
  123. }
  124. if(C3==1)
  125. {
  126. while(C3==1);
  127. return '3';
  128. }
  129. R2=1;
  130. R1=R3=R4=0;
  131. if(C1==1)
  132. {
  133. while(C1==1);
  134. return '4';
  135. }
  136. if(C2==1)
  137. {
  138. while(C2==1);
  139. return '5';
  140. }
  141. if(C3==1)
  142. {
  143. while(C3==1);
  144. return '6';
  145. }
  146. R3=1;
  147. R1=R2=R4=0;
  148. if(C1==1)
  149. {
  150. while(C1==1);
  151. return '7';
  152. }
  153. if(C2==1)
  154. {
  155. while(C2==1);
  156. return '8';
  157. }
  158. if(C3==1)
  159. {
  160. while(C3==1);
  161. return '9';
  162. }
  163. R4=1;
  164. R1=R2=R3=0;
  165. if(C1==1)
  166. {
  167. while(C1==1);
  168. return '*';
  169. }
  170. if(C2==1)
  171. {
  172. while(C2==1);
  173. return '0';
  174. }
  175. if(C3==1)
  176. {
  177. while(C3==1);
  178. return '#';
  179. }
  180. }
  181. }
  182. }
  183. void check()
  184. {
  185. if(count>3)                 //Input exceeds count 3 will execute comparison
  186.  {
  187.  flag=count=0;
  188.  j=strcmp(pswd,password);     //Comparison of input and Predefined pswd
  189.  if(j==0)
  190.    {
  191.       relay=1;                         //Turning relay on
  192.       display(0x01,0);
  193.       display(0x80,0);
  194.       for(i=0;i<=6;i++)
  195.       {display(welcome_msg[i],1);}
  196.    }
  197.  else
  198.    {
  199.       relay=0;
  200.       display(0x01,0);
  201.       display(0x80,0);
  202.       for(i=0;i<=13;i++)
  203.       {display(close_msg[i],1);}
  204.    }
  205.  }
  206. }

NOTE:

  • You can add additional security by adding trial above code.
  • It can be done by making the trial value to increase for every wrong password input and checking the condition whether it exceeds the desired trial value.
  • Once it exceeds the desired trial value disable the keypad scan and display message "No more trials" in the LCD.
  • You can also add speaker to sound a alarm once the trial exceeds to alert the people nearby.

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