Wijanarko, HeruWivanius, NadrahNovian, Taufik Ramadhan2023-01-092023-01-092017-12-22https://repository.polibatam.ac.id/xmlui/handle/123456789/1462Locker is place of storage that important for user, but locker always get some problems when using it such as key easily lost or left behind because the key have small size and easily to duplicated. It is the background of the problems to create ”The system of security locker using GSM module, Bluetooh Module and Reed Sensor”. The purpose of this project is to replace manual key to be smartphone for access the locker because manual key sometime easy lose or left behind. This research was conducted to understand the problems that occur directly and making habits in using a smartphone into a solution. The habit is always to bring smartphone anywhere so the possibility of missing or left behind is very rare. In order to use smartphone as a key, smartphone act as a transmitter which smartphone just send a message or activates bluetooth in order to unlock or lock the locker. The results of using smartphone as a electronic key for locker system is more flexible because user can access the locker anywhere and more effective because the key always bring anywhere and can not be duplicated without the permission of the user as a safety factor.idTeknik ElektroTeknik ElektronikaArduinoReed SensorThesis