I made a Line Follower Robot as directed here. The only changes I have made are that instead of TCRT5000, I have used a pair of 3mm IR LED and Receiver. My PIC is also programmed well and all the modes work as stated on the "instructable". However, the main mode, that is the Line Following Mode doesn't seem to work. I checked all the wiring and I assure you, it's all clean and well done. Regarding the Line Following mode, when I power up my robot, it starts to rotate at one place due to forward motion of Left motor and backward motion of Right motor. I tried placing the Line Follower over a line as well, however it didn't yield any results. Please help me in debugging this project.