web server update pages with graphics real-time

So I’m reading a DS18B20, a couple actually, and I can cat the output to my index.html (running lighttpd) and read it on my browser and even my iphone from anywhere in the house. Is GNUPlot the way to go? I would like to have something graphic to display the temperature change over time.

If you’re okay with five-minute resolution, you could look into using Munin. It’s dead easy to write a plugin to gather whatever data you need, and then Munin handles storing it and generating graphs.

Failing that, yeah, you should be able to make gnuplot work.