Specifications

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with the handheld unit and the relay to provide proper operation of the breath test
and the starting of the car.
The first choice option for initial prototyping would be the Sparkfun project case,
physical look and dimension are provided below in figure 2.8-1 and additional
specification will be provided in the appendix:
Figure 2.8-1. Image provided with permission from sparkfun.com
A compact design with necessary openings for output devices, it is also make of
durable plastic that can be modified if necessary. A clear version of the enclosure
is also available. Overall this is an affordable unit priced at $10. A internal
detailed drawing is provided below in figure 2.8-2 to be use in PCB and element
layout.