Abhinandan Aggarwal
Newbie level 3

why does my LDR become brownish on surface.....
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Interesting point of view, could you elaborate on that? If you take the classic example of turning on the headlights of a train automatically when it drives through a tunnel, what would you use as low cost light sensor instead?I would have considered LDR's obsolete for new design 20 yrs ago, err make that 30 yrs ago.