This project is an embedded access control system using RFID tags, built around the STM32G030F6P6 microcontroller. It uses the RC522 RFID reader module to read RFID cards and controls a 12V solenoid lock for physical access. Authorized tag information is stored in external flash memory (W25Q32) for non-volatile access control.
- RFID Reader (RC522): Reads MIFARE-compatible RFID cards/tags.
- Microcontroller (STM32G030F6P6): ARM Cortex-M0+ based low-power MCU.
- External Flash Storage (W25Q32): Stores authorized UID tags.
- 12V Solenoid Lock: Controls physical access (locked/unlocked state).
| Component | Specification |
|---|---|
| Microcontroller | STM32G030F6P6 |
| Operating Frequency | 64MHz |
| Programming Language | Embedded C |
| IDE | stm32cubeide |
| PCB Design Software | Altium Designer |
| Version Control | Git, GitHub |
| RFID Module | RC522 |
| Output | MOSFET-SSM3K333R |
| Memory | W25Q32 |
| 12V Regulator | MT3608 |
| 3.3V Regulator | TLV74333 |
The system operates as a standalone RFID-based access control unit with basic programming features via a single button and onboard indicators (LEDs and buzzer). Here's an overview of its behavior:
✅ When an RFID tag is scanned:
If the tag's UID matches an authorized entry stored in the external flash memory, the system:
Activates the solenoid lock for 1 second
the green LED blinking
Emits 4 short beeps from the buzzer
❌ If the tag's UID is not recognized:
The red LED blinking
The buzzer emits a continuous tone indicator access denied
Press and hold the LEARN button, then present an RFID tag to the reader.
The UID of the tag is stored in external flash memory.
From now on, this tag will be recognized as an authorized tag and unlock the solenoid when scanned.
Press and hold the LEARN button for 3 seconds.
The system responds by:
Turning on the yellow LED
Erasing all stored UIDs from the memory
Emitting 3 long beeps from the buzzer
Entering a brief state with a flashing red LED to indicate the memory has been cleared