User:Grtsharon/sandbox

Subscript text

History
Locks are the main line of defense that most people use to protect their valuables. A lock is a mechanical or electronic fastening device that is released by a physical object (such as a key, keycard, fingerprint, RFID card, or security token), by supplying secret information (such as a keycode or password), or by a combination thereof. The oldest known lock was found by archeologists in the Khorsabad palace ruins near Nineveh. The lock was estimated to be 4,000 years old. It was a forerunner to a pin tumbler type of lock, and a common Egyptian lock for the time. This lock worked using a large wooden bolt to secure a door, which had a slot with several holes in its upper surface. The holes were filled with wooden pegs that prevented the bolt from being opened.

Overview of Knock Detecting Door Lock
A smart lock is an electromagnetical lock which is designed to perform locking and unlocking operations on a door when it is given the correct knocking sequence.If it is a incorrect knock then it will remain as locked. This knocking sequence can be changed as the user desires at any time.

Keys can be misplaced at anytime, anywhere, anyhow. Keys have to be carried with the owner if he/she locks the door to go out even for a small reason. Especially in case of a shared room, each member has to have a set of keys with them all the time. Locks can be picked easily anytime as well and therefore, safety issues also arise.

Operation
This door lock however, does not completely replace the existing mechanical lock of the door. It simply takes over the locking/unlocking mechanism but it has to be attached to the existing lock. This is also restricted only to be fixed on to one type of locks; the rim latch lock, which will be explained later.

A knocking sequence has to be programmed in to the Arduino (microcontroller) interface at first. If the correct knocking sequence corresponding to the programmed one is given, the door will be unlocked.

Advantages
Keys can be misplaced at any time but due to this mechanism carrying of keys or searching for keys can be ignored. We came to a decision of doing this project to ease the fact of carrying a set of keys when a person leaves the house even for a small reason. The lock-unlock sequence can be programmed as desired from time to time.