Drunk driving remains a significant cause of traffic accidents and fatalities across the globe. Despite strict laws and awareness campaigns, many individuals continue to operate vehicles under the influence of alcohol, posing a severe risk to themselves and others on the road. To address this issue, technological interventions are being explored to enforce sobriety among drivers and enhance road safety.

One such innovation is the Alcohol-Based Engine Locking System, a smart solution that integrates alcohol detection with vehicle ignition control. This system is designed to analyze the driver's breath for the presence of alcohol using a gas sensor. If the alcohol level is found to be above a predetermined threshold, the system automatically prevents the engine from starting, effectively locking the vehicle. By enforcing this check before the vehicle can be operated, the system discourages drunk driving and helps reduce the occurrence of alcohol-related accidents.

The technology primarily involves a microcontroller (such as Arduino), an alcohol sensor (like MQ-3 or MQ-135), and a relay module that controls the vehicle's ignition system. Additional components like an LCD for displaying messages and a buzzer for alerts may also be included. This project demonstrates how embedded systems can be leveraged to create real-world safety applications that promote responsible driving behavior and public safety.

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