line follower using the pic16f877

hi there guys....i really need lots of help inorder to build a line follower using the pic16F877. Firstly i want to use normal leds(not IR leds) and phototransistors for the sensors. I only want the motor to use two wheels to steer it using the whole concept of differential drives. Could someone please provide me with a schematic of a robot like this. Please i really need your help and this is an emergency. Thanks a lot.

Does it have to use a microcontroller? If so, you may want to look at using a different type:
http://www.diylive.net/index.php/2005/12/13/diy-line-following-robot2/

Or you could adapt the code for the 16F877

Good Luck!