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Electronic Schematics - E

Electronic Locks Circuits

AN728: Remote Keyless Entry & Convenience Center Reference Design with LIN Bus Interface - Microchip Application Note Published 26-Sep-02  (app note)

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... (schematic)

Code Lock with ATMEL AVR  - Code Lock 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). ….(circuit design)

Combination Digital Lock - A multiple input combination lock using CMOS counter IC's. Flexibility and code change is allowed by changing output connections. (schematic / circuit design)

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.....(design)

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)

Combination Lock (PIC16F84) - (circuit)

Combination Lock for Car Liftgate - (circuit / schematic design)

Combination Lock PIC16F84 - (electronic diagram)

Combination Lock-Digital - (electronic design)

Digital Combination Lock - (schematic / circuit design)

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.

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.

Digital Lock - A Simple But Very Effective Circuit....(electronic schematic)

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

Electronic Card Lock System - (electronic Circuit / Schematic)

Electronic Combination Lock (Randy Linscott) - This circuit is very basic to build. To open a the lock which is connected to the K1 Load you must press each momentary switch in the correct sequence. The sequence used in this circuit is S1,S2,S3,S4. If any of the other switches are pressed

Electronic Combination Lock AVR - (circuit / schematic design)

Electronic Combination Lock with AVR - (electronic schematic / circuit)

Electronic door codelock PIC16F84 - (circuit design)

Electronic Lock - This is my electronic combination lock to use with an outdoor gate. The functionality is implemented in software. It turns on a relay (usually to open a door) for a few seconds…. Uses a PIC16F84A (circuit)

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.

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.

Electronic Locker - This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals.....(circuit design)

Electronic Safety Lock Based on Attiny26 - This safety-lock can be work with up to 8 different  telecards (empty  or not) as access keys. Each  tele card can be registered or  unregistered from the  system, by press the  corresponding button.…(electronic circuit)

Enhanced Alarm Keypad - (schematic / circuit design)

iButton electronic lock Circuit - This electronic lock can be used with any type of iButtons you may already have, since the only thing needed is the internal serial number, that's different for every iButton…..(circuit diagram)

Infrared gate 2 (Peter Jakab) - This is an infrared gate with two sensors planned to use in the wall in the way behind a door. It can be applied in a toilet to keep track of that someone is inside exceeding a certain amount of time. After that time elapsed, the circuit triggers the digital output which can turn on a ventilator. The time period ....(electronic circuit)

Low Cost Digital Code Lock - (electronic Circuit / Schematic)

Programmable Digital Code Lock - (electronic circuit)

Remote Door Lock (Seiichi Inoue) - …(circuit design)

Remote Keyless Entry & Convenience Center Reference Design with LIN Bus Interface Microchip Application Note Published 26-Sep-02  (app note)

Safety-Lock with Telecard as Key - This safety-lock can be work with up to 8 different  telecards (empty  or not) as access keys. Each  telecard can be registered or  unregistered from the  system, by press the  corresponding button.….(circuit design)

Simple Code Lock - (electronic Circuit / Schematic)

Simple combination lock - This experiment may be built using only one 8-position DIP switch, but the concept is easier to understand if two switch assemblies are used. The idea is, one switch acts to hold the correct….(electronic design)

Simple Electronic 'Lock' - There are six (or more) push switches. To 'unlock' you must press all the correct ones at the same time, but not press any of the cancel switches. Pressing just one cancel switch will prevent the circuit unlocking. When the circuit unlocks it actually just turns on an LED for about one second, but it is intended to be adapted to turn on a relay which could be used to switch on another circuit.....Designed by John Hewes (circuit)

Simple Low Cost Digital Code Lock - (electronic Circuit / Schematic)

Single Button Lock Provides High Security - 03/04/99 EDN-Design Ideas: Figure 1 is the block diagram of an easily programmed, single-button combination lock. You operate the lock by using a series of short and long pulses from a momentary switch that masquerades as a doorbell button. The circuit uses inexpensive CMOS logic. The retrigger able timer,.....(design idea)


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