Many people have problems with their belongings at home, and most of them have security problems to solve. To protect their house, the door should be locked, and then the house is safe; hence, an attempt has been made here to develop a smart door by using electronic devices like an Arduino and a GSM module. The door function on these devices will indicate whether the door is locked or unlocked, and the GSM module will send an SMS indicating whether the door is locked or unlocked, as well as who is unlocking the door. Another feature is the lamp. For example, the people lock and unlock the door. In some cases, the user thinks that I have locked my house door, but the door is in the unlocked position. By using a lamp, which indicates on and off, the user can see whether the door is locked or unlocked. This system has been successfully developed, and it is suitable for all kinds of houses. In past years, the technology has increased rapidly with this door locking system, and inventions have been made according to the technology. By using more components, the cost will increase, and the user can't afford to buy that device. The device should be low cost with advanced technology, then the user can easily access the device.

Arduino, locking system, GSM module, smart door