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.
Infographic: Electricity A visual cheat sheet. - Infographic: ElectricityA visual cheat sheet about electrical physics, containing the most important formulas of current and Ohm’s law expressed through an impossible water circuit analogy.
New Futuristic Style Aluminum Shock and Lifeproof Metal Case for Samsung Galaxy S8 / S8 Plus / Note 8