Ldr robot using at89s52

hello folks..

i took a look at the easy aurdino robot using LDR found at this location


i am making the same using AT89S52 controller. I wanted to ask how is can I interface the LDR using ADC 0808. I mean what clock frequency should i be using and how. Also how can i implement turning of the chasis without jerks.

I am turning the chasis by stopping one motor and letting the other run.