
38
Very sensitive to
scratch
Inexpensive, can
detect any object,
not sensitive to
water, humidity or
dust
Can be used on
curved surface,
not sensitive to
water
Average cost,
scratch resistant,
not sensitive to
humidity or
temperature
Sensitive to
scratch, low
fidelity, and
reduce visibility of
the touch screen
Very expensive,
sensitive to
scratch
Can only use your
finger, reduces
illumination, can‟t
move your finger
(so it can be able
to detect it for
position)
For 4 wire: Less
than 10 ms
For 5 wire: Less
than 15 ms
Best stability out
of all 3
Table 5 Touch screen technology comparison
Next on the list of components for a touch screen display is the controller. The
two controller configurations used are the ISA Bus and the Serial RS232. ISA
Bus controllers are limited only to a printed circuit board. The serial controllers
are built on printed circuit boards and are surface mounted using a soldering gun.
These different types of controllers are basically PC cards that attach the touch
sensor to the PC. It holds information from the touch sensor and relays the
information to the PC so it can understand it better.
Finally the software driver is an essential part in the HVAC system control that
we will be developing for the Efficient HVAC Control and Feedback System. The
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