Combination lock on the microcontroller. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Combination lock on the microcontroller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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Combination lock device for various applications. Specifically, I use a lock at home. External execution can be any, depending on the requirements for it. With a fairly simple circuit design, the code lock, however, has a number of convenient functions:

- door opening code memory. This code can be changed by entering another code - code change code. The opening code is not reset when the power is turned off.

- not changeable door opening code. Even if someone changed the opening code, you can always open the door with this code.

The lock is powered by an internal low-power power supply, but at the same time, due to a cunning actuator using a magnet, it has sufficient power and reliability at low current consumption. Archive with documentation (schematic diagram, printed circuit board, program text, drawing of the actuator) here: clock.zip

Author: Dmitry Salikoff; Publication: cxem.net

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