Specifications

9
1.5 System Overview
The Breathalyzer ignition interlock system will be consisting of three major
components, the hand-held unit, control box and the interlock system. The
system is designed to operate, such that the control box will request validation
from the hand-held unit. After confirmed validation, user will be signified to
proceed with providing breath sample to the sensing unit of the hand unit. The
hand unit will then determine the user’s blood alcohol level content. If it fall below
0.04, user will be allow to start the vehicle. Contrary, if user’s blood level is
reported to be over 0.04, interlock unit will not allow the ignition of the vehicle and
user will be ask to perform a re-test.
If the user succeeds in passing the initial breathe test. User will be ask to do a re-
test as the vehicle is in motion as a way to verify it is the correct driver who has
initiated the test and is currently driving. If the driver fails to pass the rolling re-
test, he/she will be instructed to pull over immediately by flashing lights and
buzzers. The system will not be shut off until it detects users has kill the ignition.
The control box will log this occurrence indicating the end user’s abuse of the
system and putting him/her self in danger. Shown below is a flow chart of the
system overview, Figure 1.5-1.
Figure 1.5-1 System Overview Flow Diagram