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RE: How the Photoresistor works: A simple, passive way to detect light using semiconductors
Great post and definitely learned a few things with one thing catching my eye.
On top of being portable, photoresistors are dirt cheap: Look on Ebay or Digikey and you'll find them for pennies each.
Are these primarily plastic/ceramic with a little metal? I looked at some images of these, and the images make them appear metallic, but I would expect the price to be a little higher (unless these are cheaper metals).
Cheap photoresistors are typically a small ceramic disc with a streak of the photoconductive material on top, and metal (usually steel I think because it's magnetic) leads coming out. More expensive ones will have a metal casing. The ones that cost a couple of cents are not going to have the metal housing but will still have the metal input leads.