You could try
http://www6.mailordercentral.com/igc....asp?dept=1022
(there are other pages there you might be interested in also),
http://www.greenzonecontrols.com/ used to be there but I can't find them
anymore. I'm sure there are others, but the first is a good starter.

"Ted Byers" wrote in message
.. .
Sensors and thermostats
helped instead of just timers (although timers would probably work just
fine
for a few weeks). I had an extra computer left over from upgrading my
wife's
which I could then program to control most of the sensors.

Where did you find these sensors, and exactly what were you measuring?
Finding suitable sensors has been, and continues to be, the most
problematic
part of my efforts to make a growth chamber.

I can not take a vacation since the only person who could conveniently
take
care of my plants is my sister, and she has such a black thumb she can
even
kill plastic plants. ;-) I DID manage to teach her daughter how to
keep
an african violet happy (though I help her out a bit when she's at school
or
in bed), but she is still too young to take on such a responsibility for
plants that cost just a wee bit more than her C$2 violet.

Cheers,

Ted