Design and Implementation of Alcohol Detection System in Vehicles

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The number of drunken drivers in the have increased and the deaths due to drunken drivers is increasing day by day. The main reason is that the police cannot check each and every vehicle. So this system is a remedy for this problem. In this alcohol detection system the engine’s ignition system is controlled by a circuit, with alcohol sensor. The sensor circuit is used to detect whether alcohol was consumed by the driver recently.


Our alcohol detection system consists of a set of sensors, logic circuit and a microcontroller. Main idea is that when ever the driver turns on the key the display says to blow air in to a tube. The exhaled air reaches the sensor unit where its checked for alcohol and blown air. If alcohol is detected then the engine cannot be started. driver may try to fool the system by not blowing. To avoid that a blow sensor is made, that detects blown air. Only when the air is blown and alcohol is not detected the engine starts.

This is alcohol detection sensor that senses the alcohol content in its surroundings. This is kept in path of the tube and its probes are connected to the circuit. When it detects the alcohol, resistance decreases and this triggers the flif-flop.

This is a simple sensor that is used to detect whether the air is blown or not. It is a simple arrangement with a small chamber containing water and two conductors immersed in it. When air is blown into the chamber the water level decreases the resistance across the two terminals increases, and this is sensed by the circuit.

The signals from both the sensors are compared and the relay is energized. The relay in turn drives the starter motor.

It helps in reducing road accident at a large extent.
It eradicates the inconvenience caused when a driver is...
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