Templogger is a project mainly written in ..., based on the MIT license.
This is a tool for logging and graphing temperature sensors over time. It is designed to receive data from some custom code running on a Dallas Semiconductor TINI platform or a Web Energy Logger.
You're probably better off building your own solution with RRDtool http://oss.oetiker.ch/rrdtool/, which I was unaware of when I built templogger.
If you do want to use templogger, you're best off HTTP POSTing data to the welpost.php script. It's pretty easy to reverse-engineer the format from that source code. You'll also want to set up a logrotate rule on tinidata.txt that looks something like this:
/users/home/epall/web/public/templogger/tinidata.txt {
compress
weekly
rotate 1000
create 0666
The compression is required, as templogger assumes all older data is compressed.
The sundial branch is somewhat more developed, but it's also less tested.