this thing looks really promising, and is very small ~ 1/8 of an arduino: ~1"x0.5"
8 analog i/o's
8 digital i/o's
with build in wifi.
nice development interface.
takes 30 seconds to make the led blink. Things after that need a bit more tinkering ..
you can add an arduino shield to make it pin compatible
(the programming language looks VERY similar to an arduino., but not the same.)
for $39 + USB power supply +box+cables.. you could connect:
temp sensor, open close sensor, 16 channel alarm system,...
+ some relays you could do a sprinkler (self sufficient, running its own scheduled program... and only overwrite if you want to change it.)
still needs some programming, plugin etc .. some more weeks..
Karl
http://www.spark.io