An ESP32-S3 based AirTag-like tracking system featuring BLE communication, FreeRTOS task management, IMU-based movement detection, and RFID authentication. The system enables real-time distance estimation, secure access control, and lost-mode alerts via a buzzer.

📌 Features

BLE Communication
- Transmitter (AirTag) advertises data including distance and movement status
- Receiver (Tracker) scans, connects, and sends lost mode commands
RFID Authentication
- Unlocks access to distance data
- Hardware button to re-lock RFID
Movement Detection
- IMU on AirTag detects motion and sends updates to Tracker
Distance Estimation
- Using RSSI (Received Signal Strength Indicator) or Time-of-Flight methods
Lost Mode
- Trigger buzzer on AirTag remotely from Tracker
LCD User Interface
- 1st line: Distance
- 2nd line: Motion status or "Access Denied"

🛠 Hardware Requirements

ESP32-S3 (2 units: transmitter & receiver)
RFID module (e.g., MFRC522)
IMU sensor (e.g., MPU6050, MPU9250)
I2C LCD display
Buzzer
Push button for RFID re-lock

⚙️ Software Requirements

Arduino IDE
ESP-IDF or Arduino core for ESP32
FreeRTOS
BLE libraries (ESP32 BLE Arduino)
RFID library for chosen module
IMU library for chosen sensor

🚀 How It Works

Authentication — RFID card unlocks access to distance data.
Scanning — Tracker connects to AirTag via BLE to read IMU status & RSSI.
Display — Distance and motion status shown on LCD.
Lost Mode — Tracker sends command to AirTag to trigger buzzer.
Re-lock — Button resets RFID lock.