Circuit Diagram:
🛡️ RFID Secure Relay Terminal
Industrial-Grade RFID Access Control
Designed for heavy-duty security, this system utilizes the MFRC522 RFID module to authenticate users against a Master Key database. Unlike standard locks, this system controls a high-power relay, capable of driving industrial magnetic locks or electronic door strikes.
✨ Key Features
- 💳 Card Authentication: Scans unique UIDs to grant or deny access based on authorized credentials.
- ⚡ Relay-Driven Locks: Integrated 5V Relay allows control of high-voltage or high-current locking mechanisms.
- 🚨 Motion-Triggered Alarm: PIR sensor actively guards the terminal, triggering warnings if loitering is detected.
- 📡 SPI Communication: High-speed data exchange between the MCU and RFID reader for near-instant access.
📟 Hardware Pinout Mapping
| RFID Component | Arduino Pin | Notes |
|---|---|---|
| SCK / MISO / MOSI | D13 / D12 / D11 | SPI Bus (Hardcoded) |
| SDA (SS) / RST | D10 / D9 | Slave Select & Reset |
| Relay Module | D8 | Digital Logic Output |
| PIR Sensor | D4 | Digital Input |
| OLED SDA / SCL | A4 / A5 | I2C Data/Clock |
⚠️ Power Note: The MFRC522 module requires 3.3V. Connecting it to the 5V rail will result in hardware failure.
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