I am designing sensors array for the Line following Robot, based on LDRs Resistors and transmitter LEDs, the value of LDRs Resistors in series is changing with the position of the array on the black Line, so I can measure the Deviation angle value from the voltage divider through R1 to control the tow Motors.
The value of LDR Resistors changing from 92 Kohm to 110 kohm, I put a resistor R1 in series with the LDRs, the ADC pin (A0) in arduino uno is connected to the voltage divider through R1.
Question: How I can choose the value of R1 to get the best sensitivity on A0 pin? I tried 10k ohm but I get a small changes just [4.5,4.58] volt and that's not working I need more sensitivity. How can I choose R1 to get the best sensitivity on A0 pin?