The Internet of Things (IoT) has gained widespread attention among many research areas. The modern automation has made the life more sophisticated and easier. An IoT based smart digital automated system plays a crucial part that assist people by reducing work load and implementing interactive technology in everyday life. Through our project, Smart Doors, we are making a small contribution to the enormous efforts being made to improve and simplify our lives. This is a simple project that helps users in accessing the doors within a specific range. Android software will access the door lock and the transfer of data will be performed by using the bluetooth technique. So, the end users need not to bother about the door lock as they can manage it through their cellphone within a certain proximity, and additionally, users need not to be concerned about handling a physical key. This work comprises software and hardware development. This approach intends to do away with the need for keys to open doors and the everyday struggle involved in carrying a lot of keys and prepared for installation anywhere and everywhere with the greatest haste. This helps to create a secure environment inside and outside by preventing security breaches