Six months ago we started to play with a really cool wearable prototyping board called MetaWear from Mbientlab. If you haven’t heard of them you can read about the platform over here. The idea behind them is that they are really small boards that you can use to prototype wearables using their IOS and Android API. No need to get into sorting out the communication protocol between the board and your device, dealing with writing C firmware etc..
We have been so excited about this board that we have been giving talks to introduce mobile developers to it along with the basics for getting started with the device. While the API does make things easier, there are still a lot of nuances to using the API and board. Mbientlab has published some great example apps and we are helping them fill in the gaps. As part of a series of example apps to we just published a Android version of the MetaTracker Android app. You can find out more about it over here. http://projects.mbientlab.com/metatracker-android-version-turns-your-metawear-into-a-fitness-tracker/.
Look out for other examples from us and Mbientlab and if you have any questions about these boards feel free to reach out to us.