// #define Calibrate // uncomment this line and use serial plotter. (Trend lines will show offset to apply lines 59-61) // when offsets are correct all three lines should be within a 10 count of of ...

Arduino code example for using LDR's on a model railroad layout. This approach uses (at least) 3 LDR's between the rails and all are used for detection purposes. The ambient light they see does not ...