Electronic Locks Circuits

Posted on Feb 6, 2014

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

Electronic Locks Circuits
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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...

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