I control my garden lights automatically depending on light levels inside and outside. (when its dark outside but lights are on inside the house, the garden lights go on).
I use 2 LDR voltage dividers with a 10KΩ resistance to measure the light, but the LDR for outside fails every couple of weeks/months.
It's resistance range will become something like 300-1000Ω (very bright to darkness). Only very bright light will make the resistance drop below 1000Ω - it seems the LDR is "leaking" current - no light doesn't increase the resistance anymore.
New LDRs have a range of somehing like 150-500,000Ω.
I'm wondering why is this happening... - Do they break due to the cold outside? - Do they break because of moisture (although they don't get wet but are exposed to outside air) - Will they break due to constant usage? (current is flowing through the LDR all the time?)
I have even tried another brand but it does the same.
Is this a known thing for LDRs? Thanks for any hints.