SquareWear 2.0, an open source wearable Arduino by Rayshobby:
This is SquareWear 2.0, an open-source, wearable Arduino microcontroller board. This version measures 1.7″x1.7″ in size, and has built-in LIR2032 rechargeable Lithium coin battery. It also has a number of integrated components (see below). It is designed to be sewable: you can stich conductive threads through the large pin pads, solder a wire directly onto the pads, or solder snaps onto the pads to allow quick attachment or detacthment from textfile and fabric. Best of all, it’s based on Arduino, so you can make use of numerous available Arduino libraries to help build your project! SqureWear 2.0 is perfect for wearable electronic projects as well as general-purpose microcontroller projects. It’s also a great little board for learning Arduino programming.