A "real" light sensor is typically just a CdS cell. CdS, Cadmium Sulfide,
reacts to light by changing its resistance. The circuit is very simple
(put it in series with a resistor to form a voltage divider, and read the
resultant voltage), and very cheap. That, of course, is why we'd use them
for
As an electrical engineer, I find this idea sound. With a low sampling
rate, such as 0.5 Hz (once every 2 seconds), the additional power draw
should be negligible. 1/60th Hz is far too slow to produce enough quality
for users to appreciate it. 0.5 Hz should be considered a minimum. While
the co
