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Possibly idea for a future project: a really minimal distributed sensor board. Main features:

- Small
- Cheap
- Built in wireless (Nordic chipset seems like a good choice, since it's cheap and mesh-capable)
- Headers for stacking sensor 'shields'

I'm thinking an AVR with a nordic radio on a board would work. Atmel has an AVR with built in wireless, but it's pretty expensive.
Nick Johnson's profile photoTim Hoffman's profile photoMichael Fagan's profile photoMake, Hack, Share's profile photo
Have you had a look at JeeNodes. Not Nordic but RFM12B .

There are a lot of small "plugs" a JeeNode equivalent to a sheild.

Strobotics uses RFM12B and I think was originally based on a JeeNode.

You can run a JeeNode off a single AA batter for a very long time too ;-)

There is also now a JeeNode micro which is even smaller.
+Tim Hoffman Oh, that's neat. Pretty much exactly what I was thinking of, though a little more expensive than I'd hoped.
All the schematics are there, plus a heap of libraries, so you might be able to fab something specific for your own stuff. There isn't much there in the way of components. I haven't really found anything cheaper as yet.

I have 4 JeeNodes and they do work well, and the work jcw has done some pretty amazing stuff on low power management. He has one JeeNode Micro running off a coin cell (just sending out a beacon message every minute) running continously for 75+ days.

I will end up with about a dozen JeeNodes or JeeNode Micros here.
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