Do you plan to make any device for #wearable, sports or education? This project can much help.
MetaWear contains temperature and light sensor, 10 axis motion sensing (gyroscope, magnetometer, barometer, accelerometer) and Bluetooth Low Energy (BLE).
The board is based on nRF51822 SOC from Nordic (ARM? Cortex? M0 CPU and Bluetooth Low Energy).
The board is designed for another sensors through pads.
The microcontroller contains 126kB FLASH, 16kB SRAM and memory for logging is on the board.
Dimensions of board are 24 in diameter x 3mm is height with battery.

The kickstarter project is here: https://www.kickstarter.com/projects/guardyen/tiny-bluetooth-sensors-so-you-can-make-and-connect?ref=category_recommended