A combination lock using configurable custom logic @technoblogy
Technoblogy posts a project which is a digital combination lock that only lets you activate a circuit if you know the 8-bit key. It demonstrates an application of Configurable Custom Logic, a feature included in the latest AVR DA-series chips from Microchip.
The latest AVR processors released by Microchip all include a new feature called Configurable Custom Logic, or CCL, and since their release I’ve been trying to think of compelling applications of this feature. It allows you to construct an arbitrary logic circuit that works independently of the processor. This project demonstrates one practical application, using the logic functions to construct an arbitrary logic expression.
The Combination Lock uses this configuration to allow you to set an 8-bit input, using a DIP switch, and only if you set the correct combination will the output go high and light the LED.
Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.