Why does the LDR always show 1.02 thousand if light is sensed and some value between 200-600 if no light is sensed?
And what does this mean : Some students have received an LDR with internal resistance which is different from the standard. Try using the following combinations in the given sequence
3.3v - LDR - a0 Pin - 10k - gnd
3.3v - LDR - a0 Pin - 330 - gnd.
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Because of the internal resistance of LDR which is high in some of the kits. The 10k ohm resistor would not be able to resist that. So as per the above configuration it suggests us to use a 330 ohm resistor so that you can get the accurate readings.
This actually happened with me too.
1.Try to deploy the configuration once more.
2.Moreover check the hardware connections those might be loose(possible for you)
3.Try to conduct the experiment in very dark room or
4. Use 330 k resistance(another resistance provided in the bolt kit) instead of 10k resistor to conduct the experiment.
And as according to your question it may happen that some devices have different from other in some ways, if so, to correct the error it is advised to use the other resistance.
hope it helps…