Specifications

34
Connector
Pins
Extra logic?
Cost (appx)
Lead Time
Size
USB
4
FT232 Usb to
Serial converter
board = $28
$1.25+1.25+26 =
28.50
2 Weeks
Compact
Serial (RS232)
9
MAX232 (?) -
$1.95
$1.50+1.50+2 =
$5
<1 Week
Large
Semi - Custom
5
No
$4.64+ 3.55 =
8.19
1-2 Weeks
Compact
Ethernet (out of
spec)
8
No
$1.50x2 = $3
<1 Week
Compact
USB (out of
spec)
4
no
$1.25+1.25= 2.50
<1 Week
Compact
Wireless
N/A
Dependent on
implementation
Dependent on
implementation
<1 Week
Negligible
(very
compact)
Table 2.4.7-1: Comparison of power and I/O interface options.
2.5 LEDs
There are many different types of LEDs that were researched; some of these
components were efficient, practical, and reasonable. Many others were
practicable but not reasonable for the Breathalyzer system design. For
researching on the one that would best suit our design, many factors were taken
into place. One being that this LED should provide enough light to light up in dark
areas. This means that the LED must operate between a wavelength 450 and
760 nm. Furthermore, there should be a correlation between the frequency and
current. This was taken into consideration for the reason that the LEDs would
draw a collective amount of current. One LED that was researched was the
BIPOLAR T-1 ¾ (5mm) from Fairchild Semiconductor™.
The BIPOLAR T model number MV5491A included two different frequencies
spectrums, red, which operated between 1.6V and 2.0V and green, which
operated at between 4V and 1.9 V. This specific LED had various characteristics
that would prove efficient for the Breathalyzer System design. There were many
different LEDs that were researched. Some of the common parameters that were
needed to get the correct LED for this project were low cost, low power,
sustainability, and size. These four characteristics would shape the design layout
for the LEDs aspect.
There are many different types of LEDs that were researched; some of these
components were efficient, practical, and reasonable. Many others were
practicable but not reasonable for the Breathalyzer system design. For
researching on the one that would best suit our design, many factors were taken