A system and/or method for sensing the presence of moisture (e.g., rain)
and/or other material(s) on a window such as a vehicle window (e.g.,
vehicle windshield, sunroof or backlite). Such techniques may be used in
connection with a light sensor. In certain example embodiments, a
flexible printed circuit board (PCB) includes a light sensor comprising a
light sensor flip-chip, with the light sensor flip-chip including at
least two light sensor arrays, and with each said sensor array being
configured to sense light of a predetermined wavelength. An adhesive
bonds the light sensor to the PCB. A hole is formed in the PCB and the
opaque layer so as to allow the light sensor arrays to see through the
hole formed in the PCB and the opaque layer. A state of the vehicle
lights is settable in dependence on the light sensor. The PCB is located
in or is supported by the vehicle windshield.