Update 2011-09-05: I have created a new blog about electronics only – check it out here: Electronic measurements, NSLU2 and soil moisture sensor In the middle of the picture you can see the moisture meter board from hobby-boards.com and on the right the Watermark soil moisture sensor. When the moisture sensor gets wet its electrical
Here’s a bit more explanation on how to run the temperature logging system I described earlier. The system automatically stores the value of its sensors every five minutes using the crontab function in Linux. crontab is a schedule of recurring things to be done in the form of commands to be run on the system.