GoKawiilHobbyist builds hidden lock using SparkFun's magnetic imaging tile
A hardware tinkerer describes building a concealed lock that opens with a secret magnetic gesture rather than a simple magnet swipe. The design uses SparkFun's $100 magnetic imaging tile, an 8x8 grid of Hall-effect sensors read via SPI, paired with a Teensy 4.1 microcontroller to drive a servo and lock mechanism.