We are about to launch our project, a very small Arduino-based device..
A matchbox sized programmable computer that connects to almost anything imaginable. It have very long battery life, will have wifi, bluetooth and several other basic sensors.
Please check it out, we are launching on Kickstarter Tuesday 18th of Nov.
Do you have an estimate selling price after the kickstarter? I'll be keeping an eye on your progress :)
That is an excellent idea. I have long wanted to do that myself.