Accident Detection and Reporting Helmet is a next-gen Arduino-powered smart helmet designed to detect road accidents in real-time and automatically notify emergency contacts via SMS with live GPS coordinates. It incorporates false-positive mitigation, a cancel window, multi-contact alerting, and optional voice alerts — offering a reliable, life-saving safety system for solo riders.
🏆 Winner of Best Innovation Project at Alpha Hacks 2021
🥉 Third Prize at Technovity 2020
- 📉 Rolling Average Acceleration Detection to reduce false triggers
- ⏱️ 10-Second Cancel Timer before SOS is sent (manual override button)
- 📍 GPS Fix Verification to avoid sending null/zero coordinates
- 📡 SMS Alerts to Multiple Emergency Contacts
- 🔋 Battery Voltage Pin Ready (for low battery alert logic)
- 🔴🟢🔄 LED Indicators for alert, safe, and GPS acquiring states
- 📣 Voice Playback Compatible via DFPlayer Mini (e.g., “Please help!”)
- 🧱 Modular Code Structure for easy upgrades and debugging
| Component | Pin Used | Function |
|---|---|---|
| Arduino UNO/Nano | — | Microcontroller |
| Accelerometer (3-Axis) | A3 (X), A4 (Y), A1 (Z) | Detects sudden movement |
| GSM Module (SIM800L) | TX: D2, RX: D3 | Sends SMS with GPS data |
| GPS Module | TX: D11, RX: D10 | Acquires latitude and longitude |
| Push Button | D13 | Cancels false SOS alerts |
| Buzzer | D4 | Alerts nearby people |
| LED (Green) | D6 | Safe/Ready indicator |
| LED (Red) | D7 | Accident alert indicator |
| LED (Blinking) | D5 | GPS fix in progress |
| DFPlayer Mini (optional) | TX/RX | Voice alert playback |
| Battery Voltage Input | A5 | Battery monitoring (optional) |
- Continuously monitors acceleration in X, Y, and Z axes.
- Uses a rolling average to filter out false triggers.
- If abnormal movement detected:
- Buzzer and red LED activate.
- 10-second window allows user to cancel alert via button.
- If not cancelled:
- Waits for valid GPS fix.
- Sends live location via SMS to all configured contacts.
- Optional: Plays voice alert using DFPlayer Mini.
- Green LED remains on during safe/idle mode.
-
Connect Components
- Wire all sensors, LEDs, buzzer, and modules as per table above.
-
Upload Code
- Open
AccidentHelmet.inoin Arduino IDE. - Select the board and COM port.
- Upload the code.
- Open
-
Test
- Move normally → No SOS
- Simulate strong jerk/drop → SOS triggers after 10s unless cancelled
- LED indicators and buzzer will guide interaction
| Event | Trigger | Response |
|---|---|---|
| Sudden Acceleration | ±30% deviation | Start SOS Sequence |
| Cancel Pressed | Button (D13) | Abort alert, reset system |
| Valid GPS Fix | GPS (TinyGPS) | Fetch lat/lon for SMS |
| No Cancel | Timeout after 10s | Send SMS + play voice alert |
| Low Battery (opt.) | A5 < threshold | (To be added) Alert + LED flash |
- 📱 Android companion app for contact management and live tracking
- 📡 ESP32 version with Wi-Fi/Cloud integration
- 🔋 Smart charging & battery logging system
- 🔊 Automatic voice alerts in regional languages
- 📍 Live mapping with accident logs (Google Maps integration)
This project is licensed under the MIT License.