CodeLock AVR

Posted on Oct 31, 2012

CodeLock AVR electronic combination lock is realised 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.

CodeLock AVR
Click here to download the full size of the above Circuit.

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). LCD display

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characters left:   Oct 1, 2007

Hi, I want to know how hoe to interface Lm032L to ATMEGA8515 Micro-controller. Hope a mail from you.Plz feel free to contact me at

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