Specifications

1
1. Introduction
1.1 Executive Summary
Determining the breath alcohol content of a driver under the influence can be a
well tested and exhausting procedure. To ensure that the driver is well indeed
under the influence, different examination can be performed on the driver to
determine his or her alcohol content. Many ways to do this are to take a field
sobriety test or breathe examination. To be considered driving under the
influence the person’s blood to alcohol content has to be .08% or higher. This
means that the amount of alcohol in a person’s blood is considered to affect them
to the intensity to effect their impairment to comprehend or to drive. There has
been different ways to test and person’s alcohol to breath concentration but
many are not compatible with a vehicle.
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.