Building a knock drawer lock with Adafruit and Atmel
Adafruit’s Secret Knock Activated Drawer Lock is designed to conceal traditional lock mechanisms – unlocking only when a secret pattern of knocks is detected. Essentially, a solenoid locks secures the drawer while a piezo buzzer “listens” for knocks. Meanwhile, an Atmel-powered Trinket (ATtiny85) compares the knock pattern to the stored secret knock. If they match, […]