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Clint Shock writes to the sowacs list: ===8<============== Pretty Mugawaze, We have conducted automated irrigation control since 1995. Usually it is desirable to use sensors that are more responsiveness than gypsum blocks. A summary of our work was presented in a March 2002 symposium, and I can send you the paper electronically. If you want it, please contact me directly at work: clinton.shock@oregonstate.edu Due to spot to spot soil water variability, a key is to use a number of sensors, so that typical average soil conditions control irrigations. Another key that we have used for the last 9 years is to sort data, so that if a non responsive sensors or sensor with an absurdly high resistance reading (open circuits) is not averaged into the readings used to control the next automated irrigation event. Good luck, Clint -- Dr. Clinton C. Shock (home) 1059 SW 2nd Ave. Ontario, OR 97914, USA Telephone (541) 889-7057 Cellular phone (208) 739-2674 http://www.shockfamily.net Email ccshock@fmtc.com Bruce -owner of sowacs wrote: > > Pretty mugwaze writes to the sowacs list: > ===8<============== > I am doing a project on an automated irrigation > control system I have made two gypsum blocks with > electrodes which are 1.2cm and 0.6cm apart. The 1.2cm unit > is not changing much in voltage - it reads the same > value for almost two days, but the other one is > changing from 0.1v to about 0.3v. I have put the > block in series with a resistor so that a potential divider > can be used. > What do you think could be the problem with the other block (1.2cm) > ===8<============== NOTE: To get off this list, send an email to list@sowacs.com with the subject line: unsubscribe_sowacs For full instructions see this page: <http://www.sowacs.com/subscribe/index.html>