Can I install a keyed lock in my sliding patio door if it didn't come with one?Roger E., Katy, Texas You have two options: You can get a general retrofit kit from an outfit like Swisco.com (it bills ...

[Adnan.R.Khan] had a sliding door latch plus an Arduino, and hacked together this cool but simple app controlled door lock. Mechanically the lock consists of a Solarbotics GM3 motor, some Meccano, and ...