DOOR LOCK MAKING DIGITAL CONTROLLER MICRO CONTROLLER AT89C51

Door as a physical boundary with the external environment plays an important role. Access to the environment in this entry was made as tough as possible so that it can stymie people who are not authorized to enter into the environment. The use of a conventional door lock is made of metal has some weaknesses. Lost keys, damage to the lock and key duplication illegally are some of the weaknesses of conventional keys. Use of digital lock using a microcontroller to make a security system that can stand alone. Keypad controlled by microcontroller is used as an input device in the form of code. Input code that is in use as a key to open the digital lock circuit.