On Wed, Jun 18, 2014 at 05:25:50PM -0700, John Gardner wrote: > Perhaps James can tell us a bit more about what he's up to... Thanks for the replies. My question was more general, and I haven't got a specific goal in mind yet. I don't want to dig into application so soon, as I want the application to materialise based on the techniques I can deploy. ;-} @Byron, I agree that cloudy or rainy might be a problem, but such weather is quite rare where I am, in the arid areas of Australia. Averaging over several days seems sufficient to cope with this. @IVP, thanks, watching solar panel voltage is indeed another sensing method. My remote property sensor net has five nodes, two of which are transceivers, three are transmitters. Sensing battery voltages, pump current, temperature, float switches, flow sensors, and RSSI. --=20 James Cameron http://quozl.linux.org.au/ --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .