The project aims in designing a security door locking/unlocking system using I-button technology. Apart from iButton based security, keypad is also provided to enter the password if iButton is valid. This helps in avoiding unauthorized entry.   The iButton is a computer chip enclosed in a 16mm thick stainless steel can. Because of this unique and durable container, up-to-date information can travel with a person or object anywhere they go. The steel iButton can be mounted virtually anywhere because it is rugged enough to withstand harsh environments, indoors or outdoors. It is small and portable enough to attach to a key fob, ring, watch, or other personal items, and be used daily for applications such as access control to buildings and computers, asset management, and various data logging tasks.   The intelligent device which performs the task is a Microcontroller. I-button reader, keypad, Geared DC motor is interfaced to Microcontroller. The Microcontroller continuously monitors the i-button reader and if a valid iButton is placed and correct password is entered, then only the Microcontroller unlocks the door. To perform this task microcontroller is loaded with intelligent program written using embedded ‘C’ language.          

The objectives of the project include:

1. Secure access through i-button technology.
2. Keypad to enter password if iButton is valid.
3. Magnetic door lock system.
4. Low power consumption-based system.

        The major building blocks of this project are:  

1. Regulated Power Supply
2. Micro Controller.
3. I-button reader.
4. Keypad.
5. Geared DC motor
6. LCD with driver.
7. Reset Button.
8. Crystal oscillator
9. LED indicators.

        Software’s used:  

1. PIC-C compiler for Embedded C programming.
2. PIC kit 2 programmer for dumping code into Microcontroller.
3. Express SCH for Circuit design.

          Regulated power supply:

           

Block Diagram:        

video: