Circuit Diagram:
🏦 Smart Bank Safe System
Arduino-Based Keypad & Motion Security
This interactive security system uses a 4x4 Matrix Keypad for secure PIN entry, an OLED screen for real-time user feedback, and a PIR sensor to detect intruders. It features an automated locking mechanism powered by a micro servo motor.
✨ Key Features
- 🔒 PIN Protection: 4-digit security code (Default:
1234) with an anti-tamper lockout after 2 failed attempts. - 🛡️ Intruder Detection: Passive Infrared (PIR) monitoring triggers visual and audio alarms upon motion.
- ⚙️ Auto-Lock: Servo opens the latch and automatically relocks after a 4-second delay.
- 📺 Live Display: 128x64 OLED provides greeting, status, and warning messages.
📟 Hardware Pinout Mapping
| Component | Arduino Pin | Signal Type |
|---|---|---|
| OLED SDA / SCL | A4 / A5 | I2C Data/Clock |
| Keypad Rows (1-4) | D5, D4, D3, D2 | Digital Input |
| Keypad Cols (1-4) | A3, A2, A1, A0 | Digital Input |
| Micro Servo (SG90) | D9 | PWM Output |
| PIR Motion Sensor | D13 | Digital Input |
| Buzzer / LEDs | D12, D11, D10 | Digital Output |
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