Biometric security system use Arduino Uno as a microcontroller where a finger ID will act as a door unlocking system or a key. we made a Biometric locks system using Arduino Uno, which provides control to the door locking system which is servomotor. It is a simple system with take input from finger print sensor and the output give command to servo motor to lock/unlock. The system provides you to delete the finger id using setting buttons. There are 4 setting buttons which gives you full control to customize the system.