Security and privacy issues have remained a challenge for years. Because of that it is very important to have your own system for access control, which is under your control, in every moment, when you are having your mobile device with you.
In this work, we will present an embedded system for access control based on STM32F4 discovery board. The discovery board is based on STM32F407VGT6 microcontroller, with ARM® Cortex™-M4F core with embedded Flash and SRAM. On the board are connected Bluetooth HC-05 module, RFID reader and TFT Touchscreen module. User authentication in the embedded system is based on the RFID technology. With every authentication the name of the user will be shown on the TFT Touchscreen module, and at the same time it will be sent via Bluetooth to the Android application. The string is being sent over UART.