The range of things to try is just endless…
Here is a (v2) JeeNode with a (prototype) room board and a 1-cell battery:
Note that this prototype board is turned 180° w.r.t. the official Room Board, to match the Rooms .
This node uses a 1.5 => 5V converter from SparkFun, which I had lying around. It’s far from optimal, with one third of the energy eaten up by the 3.3V voltage regulator, but it’ll have to do for now. Let’s see how long it lasts…
The whole thing is mounted on a little piece of foam board with dual-sided adhesive tape. Just to try it out.
To give you an idea of what’s flying around over the 868 MHz airwaves around here:
That’s some 10 room nodes, the OOK relay with a bunch of sensors, and the energy/gas metering packets. Note how the Linux system time is exactly in sync with the DCF77 atomic clock receiver (using UCT i.s.o. CET). Note also that the OOK relay data is currently reported twice: once through a direct USB connection, once over the air.
Lots of fun! And that’s just the beginning, as far as I’m concerned :)
On a related note: I’m investigating whether it would be feasible to bring out a complete kit for the Room Board – with motion, light, temperature, and humidity sensors all included. If I can find the right distributors and order in sufficient quantity, it might be possible to get such a kit in the shop for €39, incl. VAT. Let me just say that if it can be done, you’ll be the first to know!