PRAVESH - Smart Entry-Exit System

The PRAVESH Smart Entry-Exit System operates as an interconnected IoT-based access control and attendance solution centered around the Arduino Uno R4 WiFi board. When a user presents a 13.56MHz RFID card or IC key tag to the RC522 RFID Card Reader Module, the reader communicates with the microcontroller via the SPI protocol to capture the unique card identification (UID) number. Once the UID is read, the Arduino leverages its onboard Wi-Fi capabilities alongside the WiFiS3 and ArduinoHttpClient libraries to securely transmit this entry or exit data to a remote server running PHP and a MySQL database for logging and verification. Depending on the server response or local access authorization rules, the system provides immediate feedback. An RGB LED visually indicates status, such as green for access granted or red for access denied, while a 5V passive buzzer emits audible tones for system prompts or alerts. Simultaneously, real-time status messages, user greetings, or system instructions are rendered on the LCD1602 Parallel LCD Display utilizing an I2C interface via the Wire and LiquidCrystal_I2C libraries, minimizing the required pin connections on the breadboard. The entire circuit is wired using jumper wires and powered reliably via a Type-C USB cable, ensuring stable operation during continuous network requests and peripheral driving.