Reflow Soldering Oven with LCD Display

Hi

I'm about to try to make this Reflow Controller, but I am totally new to 
programming Atmel prossor and have no idea on how to make the HEX file. 
So I hope there are some that will be nice to help me.

I've posted the link to the project.

https://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2006/ki38/Webpage/index.html

Best Regards
Bent