About This Architecture

Smart door lock system using Arduino Uno with 4x4 keypad input, HC-SR04 ultrasonic proximity sensor, and servo motor control for locking mechanism. The Arduino Uno coordinates keypad authentication, distance detection, and actuator outputs including a 16x2 LCD display for user feedback, piezo buzzer for alerts, and red/green LEDs for status indication. This wiring diagram demonstrates a complete access control circuit with proper power distribution, signal routing via color-coded wires, and current-limiting resistors for LED protection. Fork this diagram on Diagrams.so to customize pin assignments, add additional sensors like RFID readers, or adapt the circuit for different microcontroller platforms. The modular design allows easy integration of wireless modules (Bluetooth, WiFi) for remote lock management.

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How do I wire an Arduino Uno smart door lock system with a keypad, ultrasonic sensor, and servo motor?

This diagram shows the complete wiring for an Arduino Uno-based smart lock: the 4x4 keypad connects to pins 0-6 for row/column scanning, the HC-SR04 ultrasonic sensor uses pins A5-A6 for distance detection, and the servo motor connects to pin A2 for lock actuation. The 16x2 LCD display uses pins 8-13 for status feedback, while red and green LEDs with 220Ω current-limiting resistors indicate lock s