The Breathalyzer System unit is a system that has capabilities to be a portable unit and a unit that can be connected to a relay on a vehicle. The purpose of this design is to determine a person’s absorption of alcohol and if the user has consumed enough liquor to the extent where he or she is unable to drive a car, this unit will prevent the user from starting the car. As a result this will affect the rising statistics in driving under the influence deaths. This unit is also used to authorize that someone not under the influence is capable to drive the current vehicle when the car has not yet been started.

The Breathalyzer System will be integrated into sub systems, the control box unit and the hand held unit. For the control unit, this device will determine if the car is on, how fast the car is going and other characteristics of the car itself. This will require a logic unit that will be able to read data, store, and write it to a memory device. The handle held unit will be used to display the data and have a fuel cell sensor that will read input from the user. In order to synchronizing the systems together, a microcontroller will be used to communicate the data wirelessly. The process of flow of this Breathalyzer System will start by having a control box and the handle held unit. The control box requires validation from the hand held unit. Once the user takes a sample to the hand held unit the user will hit a push button that will initiate data to start to be sampled. The data will be read will be blood alcohol concentration.

Depending on the blood alcohol concentration value, the hand held unit will behave differently. In order to view this value, the hand held unit will have a LCD screen that will display the blood alcohol concentration value. If the blood alcohol concentration value is equal to 0.04 or higher, then the control box unit will not allow the vehicle to start. If the user receives blood alcohol concentration value of less than 0.04 then the control unit box will allow the user to start the vehicle. This user is not off the hook just yet, the control box unit will require another sample reading at a random time interval. If the user receives a BAC less than 0.04, the user will be able to keep driving with no alerts. If there person receives a BAC of 0.04 or higher then hand will alert the user that they are under the influence. The control unit will initiate an alert that will begin to a process of shutting down the car. The control unit will initiate a sounds and lights until the ignition is cut off. The only way to stop the alert will be to cut the ignition off. Once the user has done this, the alert will be cut off.