temperature sensor project:help needed

hi everyone im doing a project on atmel microcontroller.

the AIM of the project is to sense the ambient temperature using lm35,digitize the data using adc0804 and then display the temperature on an LCD and when the temperature exceeds a certain threshold display the warning message .

components used are:
lm35(temperature sensor)
adc0804
at89c51(microcontroller)
lcd

source code in 'c'

if u have any information or suggestions or useful links regarding this project please reply

thanks in advance