Now a few week before, my friend and me doing an assignment that entitled " Line following robot". We use many times to construct the circuit and doing the program codes for it to function.Our group is use 4 sensors, 1 PIC16F877A, L293B and 2 tamiya motors. Finally, my line follower robot can run .So, i sure my group can enter the exhibition,however if want to compare the running speed, may be cannot score the first place.