I am developing a Solar Tracking device, at the moment only from East to West.
My problem is that I am using 2 LDRs on east/west side of a solar panel and one of them (the east one) always has a much higher output than the other one. (an error of about 20 to 40 in analog readings)
I have tried using the Calibration method provided by arduino, where I map the values from 0 and 255 based on min and max thresholds, and it helped a little.
What I'm using: Arduino UNO + Motor Shield for driving a stepper motor 1k Resistors in series with each LDR Analog Pin 4/5 for the readings
Anyone can suggest a way to minimze the error between the 2 LDR outputs?
Thank you, Vlad