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.
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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.
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