There is an increasing need for an effective system to check drunk drivers. Now we are seeing that some vehicle manufacturers are installing an alcohol detector in cars.
The likes of Nissan are bringing proactive by setting up their new concept car filled with alcohol-detection sensors. The Toyota Motor Corp. is working on a fail-safe system for cars that can detect if a driver in drunk and it can shut down the vehicle with its sensors, if it picks up signs of excessive alcohol consumption.
The systems will most likely have an alcohol sniffer or other sensors that can check a person’s odors, sweat, and awareness to see if they are capable of driving the car.
Here in this project we show that how we detect a alcohols then alarm is on and the same time lcd display shows the alcohol detection display. If the alcohol is detected then our system will switch on lights on vehicle.
Main part of this project is alcohol sensor.
Here we use TGS alcohol sensor. This sensor is a 6 pin sensor . Top and bottom of the sensor is covered with 100 mesh stainless stell wire cloth. The heart of the sensor is the cylindrical form in the middle of the unit. The cylinder is a ceramic material with the SnO2 material deposited on its surface. The heater coil is located inside the ceramic cylinder. The heater has a resistance of 38 ohms.
Output of the alcohol sensor is connected the ic 555 as a monostable trigger ic. As the sensor is detect a alcohol then ic 555 activate automatically and then output of the ic 555 is connected to the microcontroller circuit.
In the microcontroller circuit we use ic 89s51 controller. Use of this is is to control the one or many relay logic and at the same time show the message on the lcd display. If no alcohol is detected then display shows a everything is ok . If the alcohol is detected then show a warning message on the screen and at the same time relay off the supply unit.
Alcohol sensor interface.
Schimtt trigger circuit.
Relay on/off control