Results
With the completion of our system we relized that this idea could be very effective against drunk drivers. We found a couple of commercial models which range from $500-$700 dollars. The final cost of our sytem was $200. Note that our system included a keyless ignition control system and a voice chip to signal the driver that they could start the car.
The most difficult part of our design was bring together all the different systems and intergrating them into a robust and reliable product. When testing the design we noticed that it would be aggravating for the driver to wait 35 seconds for the alcohol sensor to warm up. In future designs of this system the designers should look at ways of speeding up this process.
The sensor, which claims to be a blood alcohol tester, actually measures the amount of alcohol that is in your breath. We noticed that if you drank on sip of beer and quickly breathed on the sensor that you would be regestared as legally drunk when in fact you weren`t. Overall, the system work better than we expected and hopefully the state will look at using such system to keep drunk drivers off the road.