🚨 SHADAS — Smart Helmet Accident Detection & Alert System

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🧠 Overview

SHADAS is a real-time embedded system designed to detect road accidents and automatically alert emergency contacts.
It integrates motion sensing, GPS tracking, GSM communication, and Bluetooth to provide rapid response during critical events.

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⚙️ Hardware Components

• Arduino UNO
• MPU6050 (Accelerometer + Gyroscope)
• NEO-6M GPS Module
• SIM800L GSM Module
• HC-05 Bluetooth Module
• LED (status indicator)

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🔌 Pin Configuration

Component	Arduino Pin
MPU6050	I2C (A4 SDA, A5 SCL)
GPS	RX → D4, TX → D3
SIM800L	RX → D7, TX → D8
HC-05	RX → D10, TX → D11
GPS Power	D2
LED	D13

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🚀 Features

• 📡 Real-time accident detection using:

  • Acceleration threshold
  • Jerk (rate of change of acceleration)
  • Gyroscope spikes

• 📍 GPS location retrieval with fallback handling

• 📩 Automatic SMS alert with coordinates

• 📞 Emergency call triggering

• 🔵 Bluetooth transmission of alert message

• ⏱️ Cooldown system to avoid repeated triggers

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🧪 Detection Logic

An accident is detected if any of the following exceed thresholds:

• Acceleration ≥ 3g
• Jerk ≥ 2g
• Gyroscope ≥ 250 deg/s

This multi-condition approach improves robustness and reduces false positives.

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🛠️ Libraries Used

• Wire.h
• I2Cdev.h
• MPU6050.h (Jeff Rowberg)
• TinyGPSPlus.h
• SoftwareSerial.h

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⚡ How It Works

1. Continuously reads sensor data from MPU6050
2. Computes acceleration magnitude, jerk, and angular velocity
3. Detects abnormal spikes → triggers emergency routine
4. Powers GPS module and retrieves location
5. Sends:
   • SMS via SIM800L
   • Phone call
   • Bluetooth message
6. Enters cooldown period

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🧩 System Architecture

MPU6050 → Arduino → Decision Logic
↓
GPS → Location Fetch
↓
SIM800L → SMS + Call
HC-05 → Bluetooth Output