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Electronic Lock Circuits
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Last Updated on:
Saturday, August 30, 2014 10:27 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

AN728: Remote Keyless Entry & Convenience Center Reference Design with LIN Bus Interface -  Microchip Application Note Published 26-Sep-02  (app note added 2/06)
Automatic Door Opener with PIC12c508 -  This circuit can be used to operate an electric strike or an electromagnetic lock on a door. It is not the door being opened/closed, but a small electromagnetic strike which unlocks the door. The opener has the following features currently programmed in software..... [Peter Jakab, Electrical Engineer, Engineer of Informatics]
Code Lock with ATMEL AVR  -  CodeLock AVR electronic combination lock is realized with Atmel AVR microcontroller AT90S2313 or ATtiny2313. Program in hex code is 2 kB long. User code is consisted of 1 to 4 digits. If you buy the chip than user code is consisted of 1 to 8 digits. If the code is entered in the correct sequence, then after 1 second the relay and the electric striker (in the door) switch on for 1 second and then switch off again. User code can be changed via 3x4 matrix keypad. Keypad for CodeLock can be bought at local electronic shop. Initial user code (1234) is set up with a jumper. The jumper must be inserted before the voltage (12V) connection. The jumper must be removed after 2 beeps (after 5 to 15 seconds). ….....
Combination Digital Lock -  A multiple input combination lock using CMOS counter IC's. Flexibility and code change is allowed by changing output connections…. [Circuit designed by Andy Collison]

Combination lock -  Operate your gate or something different by this simple electronic combination lock. The combination can have a chosen length of numbers or alphabets, and can be changed any time. The LCD display is optional, the circuit works fine without it. After entering the correct combination, a relay is operated for the predefined time..... [Peter Jakab, Electrical Engineer, Engineer of Informatics]
Combination Lock (nutchip) -  Combination lock are nice to enable alarms, but are useful for controlling a wide range of electric devices. These software keys can open gates, garages, TV sets, telephones, VCRs, well pumps.....In practice this circuit is capable to lock or time all the devices that can be connected to relays. (electronic design added 6/07)
Combination Lock (PIC16F84) -  (circuit added 06/07/08)
Combination Lock for Car Liftgate -  (circuit / schematic design added 6/06)
Combination Lock PIC16F84 -  (electronic diagram added 6/03)
Digital Combination Lock -  A multiple input combination loack using CMOS counter IC's. Flexibility and code change is allowed by changing output connections.
Digital Electronic Lock (Bill Bowden) -  The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated.....(added 05/07)
Digital Electronic Lock circuitdb -  The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated.....(added 03/07)
Digital Lock -  A Simple But Very Effective Circuit.....(electronic schematic added 12/08)
Door lock cancellation switch -  This is the circuit where can open the door of the car even if there be not a key.  The switch that cancels door lock is set up to the car.….(added 04/05/06)
Electronic Card Lock System -  .....

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