Update 2011-09-05: I have created a new blog about electronics only – check it out here: Electronic measurements, NSLU2 and soil moisture sensor This is my new homemade soil temperature sensor with a DS18S20 IC. The sensor is in the top of the picture. The left cable is coming from the NSLU2 computer and the
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.
My Watermark soil moisture sensor arrived from the US the other day, and I’m currently working on connecting it to the small computer that will do the measurements and put them online on this website. As far as I know it works by measuring the electrical resistance in some material inside the sensor, and this