I an building a Light follower and I found it's easier said than done. The LDRs are virtually the same to me but give values as different as 50(in terms of 0-1023) when exposed to same light. I'm using the voltage divider setup using a 10k Ohm resistor in series with the LDR and sensing voltage in the middle.
LDR +5V-------O-----|-------v^v^v^------0V | 10k pin A0
Any idea for calibrating the 2 sensors. I put the other one on A5 to reduce interference. The Indicator LED, Motor Battery, LDR and Arduino all use the same ground rail on the breadboard. Any help is appreciated.