I got my small NSLU2 computer up and running and it’s generating graphs from the garden. At the moment only the air temperature near the house is logged. The spikes in the graphs I believe is due to direct sunlight hitting the temperature sensor. I will build a shield over the sensor to prevent this. The sensor needs to be moved away from the house to get a more accurate reading.
The NSLU2 is running Debian on a 4 GB USB flash memory. I’m using a 1-wire system for the sensors together with the owfs software. rrdtool is used for generating graphs.
Here’s a script for generating the rrdtool database:
and a script for generating graphs:
Are you building your own temperature logging system? Using the NSLU2 computer, or owfs? Please leave a comment and tell a little about what your are working on.