CL-3 Digital Rotary Combination Lock
From black box to open-source project
Published in issue 406, October 2010
The CL-3 got designed and built way back at the end of the 20th century. It used an Atmel AVR AT90S1200 flash microcontroller with a rotary encoder to emulate a mechanical combination lock, triggering a relay when the correct combination was dialed. Back in those days, it was considered prudent to keep project development and design documents a closely guarded secret. Tin-lead solder was king and people were stockpiling food and weapons for the upcoming Y2K upheaval. Today we know better — open source is the way forward.
Main features
6 digit operation (three 2-digit numbers in CW-CCW-CW sequence)
ATtiny2313 microcontroller
Optical or mechanical rotary encoder
Hidden/secure programming button
Free C code |
Click below to download a PDF copy of this article from Elektor magazine. Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.
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