Qtr 8RC does not sense other tones

Hello, I’m developing pid line follower robot with qtr8rc. But I have a problem. An example, I calibrated to robot on left carton. But when robot pass right carton, robot does not follow the line. Help




It sounds like there is probably a difference in the IR reflectivity of your two surfaces. You might try setting the robot right at the intersection of the two surfaces and calibrate it that way, so it sees the entire range it will see during operation. You could also use the QTRRCRawValuesExample.ino example from our QTR sensor Arduino library to see how the surface affects your readings.