feedback using h bridge!!!

i m working on a line follower bot(actually i have just started studying 4 it and dont hav much knowledge as of now..)
can l293d hbridge be used for it(i want control over both speed and direction of motors using the hbridge)?
and how can we use this hbridge to give feedback to the microcontroller and work acc. to the feedback??

10 second google search:

Here's another **broken link removed**