So you want to bring your fitness and health gadget ideas to life? The MetaHealth dev board has you covered. It comes with Bluetooth, heart rate, GSR, and motion sensors in form of a board that you can easily program. The board connects to your smartphone, tablet, or even Raspberry Pi to stream data.
This board is compatible with the MetaWear SDK. It is 24mm in diameter and 3 mm in height. The developers are raising funds for this project on Kickstarter.