Smart Helmet with Accident Alert & Alcohol Detection

Problem statement

Riders often drive without helmets or under the influence of alcohol, and serious accidents may go unnoticed in remote areas.

Abstract

The smart helmet project integrates multiple safety features: a strap sensor ensures the helmet is worn, an alcohol sensor checks breath, and an accelerometer detects high-impact accidents. The bike ignition can be disabled if helmet is not worn or alcohol is detected. During an accident, a GSM/GPS module sends location details to emergency contacts.

Components required

• Helmet with strap switch / IR sensor
• Alcohol sensor (MQ-3)
• Accelerometer sensor
• Microcontroller
• GSM + GPS module
• Relay to control ignition (for model)
• Battery pack

Block diagram

Working

Before starting, the microcontroller checks if the helmet wear sensor is active and the alcohol level is below threshold. If not, it keeps the ignition relay open. During driving, the accelerometer is monitored; upon detecting a severe shock, it assumes an accident and sends SMS with GPS coordinates to stored contacts.

Applications

• Two-wheeler rider safety
• Student-focused road safety campaign
• Integration of multiple embedded subsystems
• Prototype for commercial smart helmets