cheap and simple way to measure temperature

[Heckler]

I am just looking for ~2 degrees F accuracy. I just want to measure ambient temp. in the range of say 0 to 100 F.

Here is a link to the base kit that I am trying to modify. http://www.chinchillasoft.com/Projects.aspx

This kit is not my design. But I wanted to add the temp sensor to make it more interesting and useful for the kids.

Is it true that the DS1820 does not also require the PIC to have an external precision voltage reference?

It appears that the LM34 does require the external voltage reference. Is that true?

This is a pretty neat kit that shows off the CNC router software on his site also. He uses it to route the PCB instead of etching the board. The kit is only $10 US and that is in the price range that kids can afford for the merit badge. If I could add the temp sensor for say $2 more then I think that would be a neat addition.

Thanks all
Dwight