pic microcontroller based electronic lock

8/12/2019 Pic Microcontroller Based Electronic Lock

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PIC MICROCONTROLLER BASED ELECTRONIC LOCK

INTRODUCTION:

An electronic lock allows actuation of an electric appliance only on entering thecorrect password. In this electronic locking syste !IC"#$%&&A is used as a processing unit.The cu is interface with a '(' atri) keypad and a "#(* lcd to for the user interface. Usingthis circuit we can ake any electrical appliance password protected.

CIDRCUIT DIA+RA,:

D- CRI!TION:

!IC"#$%&&A is an % /it icrocontroller /ased on reduced instruction set co puter 0RI C1 architecture. It has %2("' /it flash e ory3 4#% /ytes of RA, and any other internal

peripherals like ADC3 U ART3 ti ers3 --!RO,.

The 5o/ of ,CU is to recei6e signals fro the input de6ice 0keypad1 and take thecorresponding action. 7hene6er any key is pressed on the keypad3 the software progra in

,CU identifies the pressed key and accordingly turns on or turns off the appliancesi ultaneously3 it also displays a essage on the lcd screen.

A '(' atri) keypad is used to gi6e co ands and the passwords to the ,CU.

$unctions of 6arious keys of keypad and their la/elling.


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O!-RATION:

To turn on theappliance3 press 8open9 key.The syste will ask for the

password. -nter the password

as "*4' and press 8go9. Theappliance should turn on 0RC* "1 and the essage 8password9 accepted should /e displayed for two seconds followed /y the essage 8lock open9.

To turn off the appliance press 8lock9. The appliance should i ediately turn off 0RC* ;1 and the essage 8lock closed9 should /e displayed on the lcd screen.

To set a new password press 8new9 key. The syste should ask for the current and new passwords. !ress 8go9 each ti e after you enter the four digit password. The essage 8passwordsa6ed9 should appear for two seconds3 followed /y the essage 8welco e9. Now we can turn on

de6ice /y pressing 8open9 and then entering the new password that you ha6e set.

OURC- :

".-lectronics for you.

*.!ic icrocontroller and e /edded syste s< ,uha ad ali3 ickinlay3 causey.

4.An e /edded software pri er< Da6id - si on.

'.,icroprocessors theory and applications< ,.Rafi=u>>a an.

?.Introduction to icrocontrollers and their applications< T.R.!ad ana/han.

#.www.efy ag.co

Row Colu n @a/el Operation Digit entry " " " Digit 8"9 " * * Digit 8*9 " 4 4 Digit 849 " ' Nil No operation allotted * " ' Digit 8'9 * * ? Digit 8?9 * 4 # Digit 8#9

* ' @ock @ock or turn off the appliance 4 " & Digit 8&9 4 * % Digit 8%9 4 4 B Digit 8B9 4 ' New Change the password

' " C Clear or /ackspace ' * O Digit 8;9 ' 4 +o hould /e pressed after entering

password' ' Open Open the lock 0ask for password

when pressed1


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PIC MICROCONTROLLER BASED ELECTRONIC LOCK

!RO -CT ,-, -R :

"1 Nagadastagiri Reddy.c +";&-C;&;

*1 +.Na6een +";&-C;&*

41 Neha !in5are +";&-C;&'

pic microcontroller based electronic lock

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