In general, a smart card is an integrated circuit card with memory capable of making decisions. A smart card, chip card or integrated circuit card (ICC), is defined as any pocket-sized card with embedded integrated circuits which can process information. In this project, we are using a contact smart card where the information inside the card is communicated with the card reader by inserting card into the card reader. The card reader in this project used is an SR-90 SDK of 1KB memory size. In this project, the smart card reader is interfaced with the micro controller and when the card is inserted into the module, it reads the data in the card and displays on the LCD. If the data in the card is matched with the data stored in the program memory, then it compares and displays authorized message. If the data is not matched it displays unauthorized message. For authorized message, the door will be opened and closed automatically after a small delay. If it is an unauthorized person it alerts the persons through a buzzer. The door will drive by DC gear motor by l293d driver. In this project 7805 is a regulator and it avoids noise spikes in power supply. Smart card reader is connected microcontroller through serial port. These smart card readers works under 9600 or 4800 baud rates. 16X2 LCD connected to microcontroller through digital I/O lines.