Digital code lock electronic circuits and diagrams. We have already created a digital lock using arduino. This type of lock use numerical code for authentication where the correct code must be entered in order for the lock to deactivate. Fig 8 shows the circuit diagram of the regulator circuit. The secret code can be reset using a master code and. Simple combination lock chapter 7 digital integrated circuits pdf version. This code lock circuit was build around two d type flip flops ics cd40. Digital combination lock circuit exchange international cxi. This circuit illustrates the use of xor exclusiveor gates as bit comparators.
Digital keypad combination lock this simple circuit is the electronic version of the combination lock. So i drew this diagram as a map to guide me as i build each part of the proyect. Simple electronic lock project electronics club project. An access control for doors forms a vital link in a security chain. How to build digital electronic lock circuit diagram. This simple circuit is the electronic version of the combination lock. One such digital code lock is imitated in this project using arduino board and a matrix keypad.
The lock code can be set by connectiong the line wires to the pads a, b, c and d in the figure. The first 4 outputs from the cd4017 decade counter pins 3,2,4,7 are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the counter will advance. Digital code lock with lcd and keypad using 8051 microcontroller. The circuit above can be a best solution for those who want to build an effective and low cost electronic lock. It causes the positive voltage at the input of ic1, in next step. Its pin numbers 2 to 6 are wired across the 10 keypad button through a special arrangement so that pressing only a the selected sequence of the code on the 0 to 9 buttons activates the output of the ic. Using codes for the purpose of a security has been the popular trend recently. As with any project specifications not all possibilities may be covered. Otherwise, it is possible for a user to determine the combination in no more than 96 attempts, as opposed to no more than 32,768 attempts.
Consequently the output is solely a function of the current inputs. Digital electronics part i combinational and sequential logic. Arduino door lock recently, while renovating at headquarters we discussed the purchase of combination door locks. When all these buttons are pressed transistor switches the relay and the door is opened. This mini project report digital code lock provides a full. Combination locks have been there for decades and many products such as briefcase, doors are protected by them.
Read about simple combination lock digital integrated circuits in our free electronics textbook. Here the code consists of a combination of digits from 1 to 6. The advanced version comes with an option to enter user defined password at installation. In this condition, output o0 pin 2 of counter ic1 is high, while all other outputs are low.
The capacitors c3 and c4 which have capacitance of 100nf each are. Digital code lock project using arduino circuit digest. An electronic combination lock circuit using the ls7222 ic as. Using the special purpose ls7220 digital lock ic, the circuit allows a 4 digit combination of your choice to. Simple combination lock digital integrated circuits. Aug 03, 2010 the digital lock shown below uses 4 common logic ics to allow controlling a relay by entering a 4 digit number on a keypad. This is the circuit diagram of a simple electronic combination lock using ic ls 7220. If the two numbers match, bit for bit, the green go led will light up when the enter pushbutton switch is pressed. Simple digital code lock using arduino use arduino for projects. The microcontroller based door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8 bit microcontroller at89c2051 which has a. Digital code lock is a type of lock in which a sequence numbers is used to open the lock. Lockprojectdoc design and implementation of digital code.
Display the main part of the above circuit diagram is arduino uno. One transistor electronic code lock system circuit diagram. Dec 11, 2015 i am currently at the end of my first digital logic class and need some help getting started on an assignment in which we are to create a digital combination door lock. Introduction the electronic lock is often introduced to illustrate the possibilities of design of an electronic system using a topdown approach. At power on, capacitor c2 connected to pin 15 of ic1 charges to high level through 820kiloohm resistor, holding the counter in the reset state. Digital logic design project fall 201617 course instructor. At power on, capacitor c2 connected to pin 15 of ic1 charges to high level through 820kiloohm resistor. This circuit, based on the ua3730 ic with some modifiactions to produce a combination lock for a safe. As subsequent developments were along the lines, the locks were improved upon by the improvement of materials and. Build an ibutton electronic lock based around a at91c2051 microcontroller includes asm source code circuit schematic schema wiring diagram diy project schaltbild combination lock pic16f84 circuit schematic schema wiring diagram diy project schaltbild. Electronic combination lock detailed circuit diagram available. This is a complete list of digital logic design projects for those who want to learn about digital logic circuit and want to design digital logic circuit for their project. There are now dedicated combination lock ics with combinations many times greater than this circuit. Rather than buy the expensive premanufactured door locks, heres how i did it.
An electronic combination lock circuit using the ls7222 ic as a platform. The main principle of this circuit is that the door lock opens only when the buttons in series are pressed at a time. There was a small spark, and puff of smoke before all this chips were cooked. If any button which is in parallel is pressed door is locked. Need help with a digital combination lock all about circuits. Make an rgb combination door lock circuit schematic schema wiring diagram diy project schaltbild. Next, when ic1 has the input is a positive voltage.
Make sure you understand the behavioral description of the project. In this project, we have explained a simple electronic code lock using 8051 microcontorller, which can only be unlocked by a predefined code, if we enter the wrong code, the system alerts by siren the buzzer. I have complied this list from different resources. Simple electronic lock project pdf there are six or more push switches. Digital code lock project using 8051 microcontroller. It responds only to the right sequences of four digits that are keyed in remotely. This class is online and we dont exactly have a textbook or any other resources at our disposal. Electronic lock smartcard4 circuit schematic schema wiring diagram diy project schaltbild.
Simple code lock electronic circuits printed circuit board scribd. Design and implementation of a digital code lock using arduino. There is keypad module for arduino that can help us to set combination password for various things, you may also use rfid cards to provide access and in this tutorial, i am going to explain how you can make push button combination lock. Digital clocks have been built by countless electronics hobbyists over the world. Door lock circuit using digital code making easy circuits. I decided to come up with a plan to build these locks. It responds only to the roght sequence of four digits that are keyed in remotely. Code lock circuit using dual flip flop ic cd40 gadgetronicx. This circuit is designed around digital ic 7400 which is nand gate. You knowthe ones with the keypad and the 4 digit pin that unlocks the door.
Here the microcontroller controls the entire process like entering the password from the keypad, compares the entered password with the predefined password, drives the buzzer and send the status to the display. Feb 17, 20 this circuit is eminently suitable as a digital code lock. Using the special purpose ls7220 digital lock ic, the circuit allows a 4 digit combination of your choice to activate a relay for a set period of time. Digital code lock project reportpdfppt download everyone wants to be as much secure as possible.
I do not describe how to work this circuit into a real security system or lock. This simple code lock circuit described here is of an electronic combination lock for daily use. The circuit diagram of the digital code lock using arduino is shown in the figure below. Pdf design and implementation of a digital code lock using. This lock was the prototype of those being used in contemporary bank vaults. Electronic combination lock circuit using ic ls 7220 description this is the circuit diagram of a simple electronic combination lock using ic ls 7220. The authentication method used here is a four digit numeric code which is entered through the keypad.
Most of these circuits will be added to instructables after christmas. The ic has many features which you can utilise but just a. This could be the circuit diagram of a easy electronic combination lock by using ic ls 7220. Oct 17, 2009 a digital combination lock circuit which allows users to light up an led or other devices based on a particular three digit secret code. Traffic light control system digital logic design project. Design and implementation of a digital code lock ijareeie. Circuit diagram of the electronic combination lock.
Dec 15, 2016 digital logic design project fall 201617 course instructor. This instructable is for two purposes 1 to understand and learn the fundamentals of sequential logic 2 use that knowledge to create a digital clock. If anyone does consider building such a circuit, then my advice would be to stop and look in your local electronic parts catalogue. Design and implementation of digital code lock using vhdl introduction the circuit described here is of an electronic combination lock for daily use. This project can be built with 8051 series microcontroller, keypad, buzzer, lcd. Oct 07, 2015 one transistor electronic code lock system circuit principle. The operation of a single d type flip flop unit is very important to understand the working principle of the above circuit. This article is about a simple digital code lock using arduino. A similar type of electronic project is presented right below called electronic code lock circuit which ensures the use of four digits in code locking process and these codes are keyed in remotely. Later, we will study circuits having a stored internal state, i.
As you can see, if we do not press the switch b, it will not change any more of ic. Find these and other hardware projects on arduino project hub. We have developed an advanced digital code lock using arduino which is a much improved version of this project. Digital code lock or digital combination lock are a type of digital locks where a combination of digitscharacters or both are used for unlocking the lock.
Digital combination lock circuit schematic schema wiring diagram diy project schaltbild. Electronic combination lock circuit circuit operation. Get free 2day shipping on qualified electronic door locks products or buy hardware department products today with buy online pick up in store. Pdf the increasing rate of crime, attacks by thieves, intruders and vandals, despite all forms of security gadgets and. As of recently, ive been working on several combination lock circuits. In 1958, the first electronic combination lock was invented 3,7. The design of a simple electronic code lock is demonstrated consid. Security is a major concern in our day to day life, and digital locks have became an important part of these security systems. So the next switch that we must press to be switch b, s2. Jan 10, 2018 the complete circuit of the proposed door lock circuit using digital code is configured around the ic ls7220. Four of these xor gates compare the respective bits of two 4bit binary numbers, each number entered into the circuit via a set of switches.
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