Full Build Design for RFID E-Lock, uses PN532 Controller, Vehicle Battery, Teensy 3.2
Proclaiming “secure locks are always better than alarm systems or cameras,” Adafruit forums user Elmue set about to design and build an electronic door lock – and the results are amazing! With thorough build notes, source code, and datasheets provided, you can feel confident tackling this project whether you require the added security or want to issue ‘keys’ quickly in-house. The most interesting aspects of the build to me are the battery, designed to operate for ~4 days in the case of a power failure, and also the tips on calculating Rx for a door lock solenoid.
PN532 NFC/RFID controller breakout board – v1.6: The PN532 is the most popular NFC chip, and is what is embedded in pretty much every phone or device that does NFC. It can pretty much do it all, such as read and write to tags and cards, communicate with phones (say for payment processing), and ‘act’ like a NFC tag. If you want to do any sort of embedded NFC work, this is the chip you’ll want to use! Read more.
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, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, 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.