Here is a smart node that lets you build and program your own smart wearables. Spora is as tiny as a coin but comes with an accelerometer, magnetometer, gyroscope, environmental temperature sensor inside. A Bluetooth module is also available for transmitting data.
The device is not only thin and smart but also customizable. It has interchangeable components, so you can change its sensors, MCU, or Bluetooth module. Spora can be used for home automation, fitness wearables, and other similar projects.