Does it happen, if an LDR is exposed to light (on LED) for a period of time say, 2 hours, then its linearity is affected i.e it does not decrease or increase its resistance proportionally to the brightness of the light as it does in the start.

Steve, if you get this message, you still owe me a reply to my previous positing of Optocoupler............remember pal.

Thank you

Babar/