My QTR-8RC array sensor number 7 & 8 doesnt work

hello ! i am working on a line follower robot. I bought a QTR-8RC reflectance array sensor for this purpose. While working with the sensor i noticed that sensor number 7 and 8 of my array doesnt seems to give reading properly. I first thought there might be some problem with my code so i tested it with the QTR-8RC raw data value code from the arduino examples but still the problem REMAINS. I bought another sensor but it still give reading of only the first 6 sensors but sensor 7 and 8 are still not working properly. Please HELP !!! As i seems to have run out of ideas.

I am using Arduino mega 2560 (although i have also tried with uno) and i haven’t split the sensor.


I am sorry you are having problems using your QTR-8RC sensors. What are the raw values your are seeing when you use the QTRRCRawValuesExample code? Could you tell me more about your setup? How do you have the sensor connected? Could you post a wiring diagram and pictures of your actual setup showing all your connections?

- Grant