Thanks Dan – is your code available available on the web – at least the parts that deals with determing the Irrigation scaling factors or whatever you use? How do you find Weather Reach stations in your vicinity? I can find one close to me (http://www.exactet.ca/WeatherDetails.asp?loc=scarborough) but this doesn’t seem to have correct info, at least not when it comes to rainfall over the last few days. Can you calculate solar radiation yourself using some sort of sensor connected to the pi?